机械专业英语期末考试题及答案

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机械英语试题及答案解析

机械英语试题及答案解析

机械英语试题及答案解析一、选择题(每题2分,共20分)1. What is the term for the process of removing material froma workpiece to create a part?A. MachiningB. WeldingC. CastingD. Forging答案:A2. Which of the following is a type of metal cutting operation?A. DrillingB. SolderingC. BrazingD. Annealing答案:A3. The term "CNC" stands for:A. Computer Numerical ControlB. Closed Network CircuitC. Centralized Network CommunicationD. Continuous Numerical Calculation答案:A4. What is the primary function of a lathe?A. To shape woodB. To cut threads on a workpieceC. To bend metal sheetsD. To forge metal答案:B5. In the context of manufacturing, what does "CAD" refer to?A. Computer Aided DesignB. Computer Aided DraftingC. Computer Aided DevelopmentD. Computer Aided Diagnosis答案:A6. Which of the following is a common material used in the production of machine parts?A. PlasticB. CeramicC. AlloyD. Glass答案:C7. The process of joining two pieces of metal by heating them to their melting point is known as:A. SolderingB. BrazingC. WeldingD. Gluing答案:C8. What is the role of a milling machine in the manufacturing process?A. To cut internal threadsB. To shape the surface of a workpieceC. To drill holesD. To create a smooth finish on a surface答案:B9. The term "tolerance" in mechanical engineering refers to:A. The maximum weight of a partB. The acceptable variation in size or shape of a partC. The minimum strength of a materialD. The standard size of a part答案:B10. What is the purpose of a jig in manufacturing?A. To hold workpieces in place during machiningB. To measure the dimensions of a partC. To cut threads on a workpieceD. To provide power to a machine tool答案:A二、填空题(每空1分,共10分)11. The process of shaping metal by applying pressure is known as _______.答案:Forging12. A _______ is a tool that holds a cutting tool and guides it through a specific path.答案:Cutter13. In machining, the term "feed rate" refers to the _______ of the tool relative to the workpiece.答案:Speed14. The _______ is a device that can be used to measure the internal diameter of a hole.答案:Micrometer15. The process of hardening a metal to increase its strength is called _______.答案:Quenching16. A _______ is a machine tool used for shaping a workpiece by removing material.答案:Milling Machine17. The _______ is the process of cutting a workpiece along a straight line.答案:Sawing18. The _______ is a type of machine tool used for cutting internal threads.答案:Tapping Machine19. The _______ is the process of heating and cooling a metalto alter its physical properties.答案:Heat Treatment20. A _______ is a device that holds a workpiece in place during machining.答案:Vise三、简答题(每题5分,共10分)21. Explain the difference between a milling machine and a lathe.答案:A milling machine is used for shaping the surfaceof a workpiece by removing material with a rotating multi-toothed cutter, whereas a lathe is used for shaping a workpiece by rotating it and cutting it with a stationary tool.22. What is the purpose of a jig in the manufacturing process?答案:A jig is a device used in manufacturing to hold a workpiece in a specific position while it is being machined, ensuring accuracy and repeatability in the production process.四、论述题(每题15分,共15分)23. Discuss the importance of precision in mechanical engineering and how it affects the performance of a machine.答案:Precision in mechanical engineering is crucial asit ensures that components fit together correctly andfunction as intended. Inaccurate parts can lead to poor performance, increased wear, and even failure of the machine. Precision is achieved through the use of。

机械专业英语期末考试复习题库

机械专业英语期末考试复习题库

metal金属nonferrous非铁金属,有色金属ferrous黑色金属copper铜aluminum 铝strength强度hardness硬度corrode腐蚀foundry 铸造、铸造厂casting铸件、铸造pig iron 生铁drop forging 落锤锻tolerance公差furnace炉子pyrometer 高温计solder焊料weld焊接electrode 电极anneal退火Melting point熔点grinding 磨削加工tempering 回火quench 淬火、熄灭modulus 系数,模elasticity弹性elastic 弹性的mesh 啮合worm蜗杆spur gear直齿圆柱齿轮helical gear斜齿圆柱齿轮straight bevel 直齿锥齿轮worm gear 涡轮lubricant润滑剂pitch螺距lead 导程torque 扭矩rack齿条left hand threads左螺纹right hand threads 右螺纹cam凸轮follower 从动件pulley 滑轮belt 皮带critical 临界点woodruff key 半圆键cantilever 悬臂tepered key 锥形键washer 垫圈spring 弹簧screw 螺钉bolt螺栓coupling 联轴器nut 螺母chain 链条bearing 轴承rigid刚性的intensity [强度flexibility挠性inertia惯性tolerance公差pin-joint 铰接hinge 铰链brake制动器lathe 车床thread 螺纹drilling钻削boring 镗削milling铣削turning 切削friction 摩擦力chip 屑片external grinder 外圆磨床die 模具internal grinder 内圆磨床finish粗糙度surface grinder 平面磨床centerless grinder 无心磨床cutter grinder工具磨床wear 磨损refinement精加工roughing operations 粗加工twist drill麻花钻twist drill麻花钻trail 踪迹, 痕迹, 形迹jack 提高robotics机器人技术manipulator 操作者, 操纵者, 机械手binary二进位的, 二元的swarf金属屑rake angle前角rolling contact bearing滚动轴承sliding contact bearing滑动轴承angular contact bearing角接触轴承Read-only memory 只读存储器Hard automation刚性自动化Random access memory 随机存储Geometric modeling几何造型Engineering analysis工程分析Kinematics运动学Automatic drawing自动绘图numerical control数字控制factory Management工程管理Computer Numerical Control计算机数控Direct numerical control 直接数控User interface用户接口Knowledge base知识库(1).cad,cam全称,功能Cad:Computer-aided design1. Geometric modeling 几何造型2. Engineering analysis 工程分析3. Kinematics运动学 4. Automated drafting 自动绘图Cam:computer-aided manufacturing1. Numerical control 数字控制2. Process planning 工艺加工过程 3. Robotics 机器人技术 4. Factory management 工厂管理(2)齿轮的种类:1.spur gear2.helical gear3.straight bevel(3)铸造工艺包括那几步:1. making molds2.preparing and melting the metal3. pouring the metal into the molds4. cleaning the castings.(4)列举几种常用的机械零部件:Gear key shafe screw bolt bearing(5)皮带传动是否精确为什么?not precise Belt depend on friction on the pulleys and some slippage is inherent in their operation.(6)道具磨损类型有哪些:1. Flank wear2. crater wear3.notch wear(7)钢的力学性能:(1) Strength 强度(in tension张力, compression压力, shear 剪切力and bending弯曲力) (2) Stiffness刚性(3)Ductility延展性(4) Impact strength 冲击强(5) Hardness硬度(6) Toughness韧性句子翻译1对于深沟球轴承沟槽的深度大约是球直径的1/4In deep-groove ball bearings, the races are approximately one fourth as deep as the ball diameter. 2.把金属件····焊接强度来决定There are a number of methods of joining metal articles together, depending on the type of metal and the strengthof the joint which is required.3.软钎焊·······的工艺Soldering is the process of joining two metals by a third metal to be applied in the molten state.4.力学性能是什么Mechanical properties are the characteristic responses of a material to applied forces.5.用于冷加工的机器叫做压力机The machine used for most cold-working operations is known as a press.6.切削刀具····The cutting tool must be made of an appropriate material; it must be strong, tough, hard, and wear resistant.7.铸造工艺···Foundry processes consist of making molds, preparing and melting the metal, pouring the metal into the molds, and cleaning the castings.。

(完整版)机电专业英语复习题及答案

(完整版)机电专业英语复习题及答案

机电专业英语期末复习试题一.选择题1. If all points in a linkage move in parallel planes the system undergoes plan ar motion and the linkage may be described as a ______ .A。

planar motion B. planar linkage C. joints D. slide2. Though frame material and design should handle damping,_____ are sometimes built into frame sections to handle specific problems.A 。

beams B. holes C。

dampers D。

screw3. The maximum allowable deflection of a shaft ______ determined by critical sp eed, gear,or bearing requirements。

A。

often B. must C。

was D. is usually4. We will have to _____ to better and better solutions as we generate more information。

A. repeat many times B。

iterating C。

iterate D。

try ways5。

If a product configuration is _______ specified and then examined to determ ine whether the performance requirements are met。

A。

finally B. tentatively C。

机械专业英语试题及答案精编WORD版

机械专业英语试题及答案精编WORD版

机械专业英语试题及答案精编W O R D版IBM system office room 【A0816H-A0912AAAHH-GX8Q8-GNTHHJ8】学院院长(系主任)(签字)C. degradation…corrosionD. corrosion… degradation12. Most frames _______ cast iron, weld steel, composition, or concrete.A. are made fromB. are made up ofC. was produced byD. was consist of13. Rotating shafts particularly those that run at high speeds, must be designed toavoid operationat speeds.A . lowB .overload C. critical D. hollow14. Although cast iron is a fairly cheap material, each casting requires a .A. patternB. modelC. moldD. patent15. The term is used to describe joints with surface contact, as with a pin surrounded by a hole.A. high pairB. low pairC. surface pairD. rotary pair二、完型填空(在每个小题四个备选答案中选出一个正确答案,本大题共15小题,每小题1分,总计15分)The term shaft usually refers to a relatively long member of round cross section that rotates and transmits power. One or more members such as gears,sprockets, pulleys, and cams are usually (16) to the shaft by means of pins, keys, splines, snap rings, and other devices. These latter members are among the “associated parts” considered in this text, as are couplings and universaljoint, which serve to (17) the shaft to the source of power or load.考生注意:考试时间 120 分钟试卷总分 100 分共 5 页第 1 页Sometimes members like gears and cams are made (28) with shaft,but more often such members (which also include pulleys,sprockets, etc)are made separately and then(29) shaft. Theportion of the mounted member in contact with the shaft is thehub. Attachment of the hub to the shaft is made in variety ofways. A gear can be gripped (30) between a shoulder on the shaftand a spacer, with torque being transmitted through a key. Thegrooves in the shaft and hub into which the key fits are calledkeyways.16、 A) cement B) attached C) connected D)concrete17、 A) endure B) transmit C) serve D)connect18、 A) support B) meet C) satisfy D) strong19、 A) aims B) idler C) terminal D) tomb20、 A) due to B) weather C) whether D) for21、 A) elasticity B) torsional C) inertia D)acceleration22、 A) subjected B)…connect C) and D) From23、 A) deeply B) strength C) clearly understandD) long time24、 A) identify B) cross C) round D) 订线read as follows.Engineering design is the process of devising a system, component, or process to meet desired needs. It is decision making process(often iterative),in which the basic sciences, mathematics, and engineering sciences are applied to convert resourcesoptimally to meet a sated objectives and criteria, synthesis, analysis,construction ,testing, and evaluation. The engineering design component of a curriculum must include most of the following features : development of student creativity, use of open-ended problem statement and use of modern design theory and methodology, formulation of design problem statement and specification, consideration of alternative solutions, feasibility considerations, production process, concurrent engineering design, and detailed system descriptions. Further, it is essential to include a variety of realistic constraints such as economic factors, safety, reliability, aesthetics, ethics, andsocial impact.31、what’s the main meaning of message (1)?A) Engineering design is a systematic process B) materials engineer’s mainworkC) mechanical engineer’s has good idea D) electrical engineer’ mainduty32、In the author’s opinion, the design process is very complex and should takeninto account many factors, from the message who should NOT join into the design team _______.A) environmentalists,B) sociologistsC) engineersD) Government officials33、From the message, we can know the meaning of words “ABET”(at line third paragraph) is _____.A) a set of accredits standardB) a kind of design methodC) a department of US government which responsible for engineering designD) A set of law34、It can be concluded from the passage that in the exercise and training of student, which character of the following is NOT included in the curriculum ______.A) creativityB) new materialC) ethicsD) economic factors35、The title of the message is ______.A) the roles of engineers in manufacturingB) the importance of mechanical designC) engineering designD) The process of machine designTEXT 2Working drawings are the complete set of standardized drawings specifying the manufacture and assembly of a product based on its design. The complexity of the design determines the number and types of drawings. Working drawings may be on more than one sheet and may contain written instructions called specifications.Working drawings are blueprints used for manufacturing products. Therefore, the set of drawings must:(a) completely describe the parts, both visually and dimensionally;(b)show the parts in assembly;(3)identify all the parts; and (4)specify standard parts. The graphics and text information must be sufficiently complete and accurate to manufacture and assemble the product without error.共 5 页第 2 页(1) Detail drawings of each nonstandard parts.(2) An assembly or subassembly drawing showing all the standard and nonstandard parts in a single drawing.(3) A bill of materials (BOM).(4) A title block.A detail drawing is a dimensioned, multiview drawing of a single part, describing the part’s shape, size, material, and surface roughness, in sufficient detail for the part to be manufactured based on the drawing alone. Detail drawings are produced from design sketches or extracted from 3-D computer models. They adhere strictly to ANSI standards and the standard for the specific company, for dimensioning, assigning part numbers, notes, tolerances, etc.In an assembly, standard parts such as threaded fasteners and bearings are not drawn as details, but are shown in the assembly view. Standard parts are not drawn as details because they are normally purchased, not manufactured, for assembly.For large assemblies or assembled with large parts, details are drawn on multiple sheets, and a separate sheet is used for the assembly view. If the assembly is simple or the parts are small,detail drawings for each part of an assembly can be placed on a singlesheet.TEXT 3One principle aim of kinematics is to create (design) the desired motions of the subjects’ mechanical parts and then mathematically compute the positions, velocities, and accelerations, which those will create on the parts. Since, for most earthbound mechanical systems, the mass remains essentially constant with time, defining the accelerations as a function of time then also defines the dynamic forces as a function of time. Stresses, in turn, will be a function of both applied and inertial (ma) forces. Since engineering design is charged with creating systems which will not fail during their expected service life, the goal is to keep stresses within acceptable limits for the materials chosen and the environmental conditions encountered. This obviously requires that all system forces be defined and kept within desired limits. In machinery, the largest forces encountered are often those due to the dynamics of the machine itself. These dynamic forces are proportional to acceleration, which brings us back to kinematics, the foundation of mechanical design. Very basic and early decision in the design process involving kinematic principles can be crucial to the success of any mechanical design; a design which has poor kinematics will prove troublesome and perform badly.Any mechanical system can be classified according to the number of degree of freedom (DOF) which it processes. The system’s DOF is equal to the number of independent parameters which are needed to uniquely define its position in space at any instant of time.A rigid body free to move within a reference frame will, in the general case, has complex motion, which is a simultaneous combination of rotation and translation. In three-dimensional space, there may be rotation about any axis and also simultaneous translation which can be resolved into components along three axes. In a plane, or two-dimensional space, complex motion becomes a combination of simultaneous rotation about one axis (perpendicular to the plane) and also translation resolved into components along two axes in the plane41、Kinematics research focus on the following EXCEPT ______..A) accelerations B) forceC) positions, D) velocities42、From the passage that for the design engineer the first and most important is____A) the service life of a machine B) the materials chooseC) the degree of freedom D) kinematic principles43、An mechanical system has uniquely defined position in space at any instant of time that ___.A) It should has one DOFB) It should Has two DOFC) the DOF and the number of independent parameters should equalD) It should has any DOF as want44、 which one of the following is NOT TRUE _______?.A) A rigid body free to move in three-dimensional space may rotation about anyaxisB) A rigid body free to move in three-dimensional space is a simultaneouscombination of rotation and translationC) A rigid body free to move in three-dimensional space can be resolved intocomponents along three axesD) A rigid body free to move in three-dimensional space may has complex motion45、The best title for this passage would be _______.A) kinematics B) dynamicsC) kinematics and dynamic D) the important of kinematics共 5 页第3 页1.将下列英语句子译成汉语(共5小题,每小题2分)(1)A perfectly rigid or inextensible link can exist only as a textbook type of model of a real machine member.(2)Foundations should ensure the machine’s stiffness; shock absorption and isolation are secondary considerations.(3)Thus, if a mechanical component such as a spring is subjected to repetitive or cyclical applications of stress levels much lower than the ultimate strength, it will fracture after a large number of repetitions of this stress.(4)Interchangeability means that identical parts must be interchangeable, i.e., able to replace each other, whether during assembly or subsequent maintenance work; without the need for any fitting operations.(5)A gear can be gripped axially between a shoulder on the shaft anda spacer, with torque being transmitted through a key.2、将下段英语翻译成汉语(10分)As we look around us w e see a world full of “things”, machines, devices, tools, things that we have designed, built, and used; things made of wood, metals, ceramics, and plastics. We know from experience that some things are better than others; they last longer, cost less, are quieter, or are ease to use. Ideally , however, every such itemhas been designed according to some set of “functional requirements”(5)当一个装置意外地失效后,通常需要进行研究工作,来找出失效的原因和确定可能的改正措施。

机械英语试题及答案详解

机械英语试题及答案详解

机械英语试题及答案详解一、选择题1. The term "mechanical engineering" refers to the application of engineering principles to:A. Chemical processesB. Electrical systemsC. Design and manufacture of machinesD. Software development答案:C2. What is the primary function of a bearing in a mechanical system?A. To convert energyB. To reduce frictionC. To increase efficiencyD. To absorb heat答案:B3. The process of converting a rough workpiece into a finished part is known as:A. MachiningB. WeldingC. CastingD. Forging答案:A二、填空题4. The formula for calculating the force exerted by a springis known as ________.答案:Hooke's Law5. In mechanical design, the term ________ refers to thestudy of the forces and moments acting on a body.答案:Statics6. The unit of pressure in the International System of Units (SI) is ________.答案:Pascal (Pa)三、简答题7. Explain the difference between static and dynamic friction.答案:Static friction is the force that must be overcometo start moving an object at rest, while dynamic friction is the force that opposes the motion of an object that isalready moving.8. Describe the purpose of a gear in a mechanical system.答案:A gear is used to transmit motion and force from one part of a system to another, often changing the speed and/or direction of the motion.四、计算题9. A hydraulic press has a piston with an area of 0.02 m². If the pressure applied to the piston is 5 MPa, calculate the force exerted by the piston.答案:Force = P ressure × Area = 5 × 10⁶ Pa × 0.02 m²= 100,000 N10. A lever is balanced when the product of the effort force and its distance from the fulcrum is equal to the product of the load force and its distance from the fulcrum. If the effort force is 300 N and the load force is 1200 N, and the effort is applied 2 m from the fulcrum, calculate the distance from the fulcrum to the load.答案:Let the distance from the fulcrum to the load be\( x \). According to the principle of levers, \( 300 N\times 2 m = 1200 N \times x \). Solving for \( x \) gives\( x = \frac{300 N \times 2 m}{1200 N} = 0.5 m \).五、论述题11. Discuss the importance of mechanical vibrations in the context of machinery operation and maintenance.答案:Mechanical vibrations are crucial in machinery for several reasons. They can indicate the health of a machine, with abnormal vibrations often signaling a problem such as imbalance, misalignment, or wear. Monitoring vibrations can help in predictive maintenance, preventing breakdowns and extending the life of machinery.12. Explain the concept of stress concentration in mechanical components and its implications.答案:Stress concentration occurs in mechanical components where the stress is higher than the average stress due to geometrical discontinuities or material defects. This can lead to premature failure of the component under load, as the high-stress areas are more susceptible to fatigue and cracking. Designing to minimize stress concentrations and using materials with good fatigue resistance can mitigate these effects.。

机工英语考试题库及答案

机工英语考试题库及答案

机工英语考试题库及答案一、单选题(每题2分,共40分)1. The machine is designed to operate at a speed of ________.A. 1000 rpmB. 1500 rpmC. 2000 rpmD. 2500 rpm答案:B2. The ________ of the engine is crucial for its performance.A. efficiencyB. capacityC. powerD. torque答案:A3. The ________ system is responsible for cooling the engine.A. lubricationB. exhaustC. coolingD. fuel答案:C4. The ________ is used to measure the temperature of the machine.A. thermometerB. ammeterC. voltmeterD. tachometer答案:A5. The ________ is a key component in the transmission system.A. clutchB. brakeC. gearD. belt答案:C6. The ________ is used to control the speed of the machine.A. governorB. regulatorC. controllerD. actuator答案:A7. The ________ is responsible for converting mechanical energy into electrical energy.A. generatorB. motorC. alternatorD. transformer答案:A8. The ________ is used to reduce the speed of the machine.A. pulleyB. leverC. gearD. belt答案:C9. The ________ is used to measure the pressure of the machine.A. manometerB. barometerC. voltmeterD. ammeter答案:A10. The ________ is a type of bearing that allows for rotation.A. ball bearingB. roller bearingC. plain bearingD. thrust bearing答案:A11. The ________ is used to control the flow of fuel into the engine.A. carburetorB. injectorC. pumpD. filter答案:B12. The ________ is a type of valve that controls the flow of fluids.A. gate valveB. check valveC. globe valveD. butterfly valve答案:A13. The ________ is used to measure the electrical current in a circuit.A. voltmeterB. ammeterC. ohmmeterD. wattmeter答案:B14. The ________ is a type of joint that allows for limited movement.A. riveted jointB. welded jointC. bolted jointD. pinned joint答案:C15. The ________ is used to measure the electrical resistance in a circuit.A. voltmeterB. ammeterC. ohmmeterD. wattmeter答案:C16. The ________ is a type of bearing that operates on a sliding surface.A. ball bearingB. roller bearingC. plain bearingD. thrust bearing答案:C17. The ________ is used to measure the electrical power in a circuit.A. voltmeterB. ammeterC. ohmmeterD. wattmeter答案:D18. The ________ is a type of bearing that supports a rotating shaft.A. ball bearingB. roller bearingC. plain bearingD. thrust bearing答案:A19. The ________ is used to control the temperature of the machine.A. thermostatB. regulatorC. controllerD. actuator答案:A20. The ________ is a type of valve that prevents backflow of fluids.A. gate valveB. check valveC. globe valveD. butterfly valve答案:B二、填空题(每题2分,共20分)21. The ________ is a type of bearing that supports a rotating shaft and reduces friction.答案:ball bearing22. The ________ is used to convert the linear motion of a piston into the rotational motion of a crankshaft.答案:crankshaft23. The ________ is a type of valve that controls the flow of fluids by rotating a disc.答案:butterfly valve24. The ________ is used to measure the electrical voltage in a circuit.答案:voltmeter25. The ________ is a type of bearing that operates on a rolling element.答案:roller bearing26. The ________ is used to convert the rotational motion of a crankshaft into linear motion.答案:piston27. The ________ is a type of valve that controls the flow of fluids by sliding a gate.答案:gate valve28. The ________ is used to measure the electrical current in a circuit.答案:ammeter29. The ________ is a type of bearing that operates on a sliding surface and reduces friction.答案:plain bearing30. The ________ is used to measure the electrical resistance in a circuit.答案:ohmmeter三、判断题(每题2分,共20分)31. The governor is used to control the speed of the machine. (对/错)答案:对32. The clutch is a key component in the transmission system. (对/错)答案:对33. The pulley is used to increase the speed of the machine. (对/错)答案:错34. The ammeter is used to measure the electrical current in a circuit. (对/错)答案:对35. The generator is responsible for converting electrical energy into mechanical energy. (对/错)36. The carburetor is used to control the flow of fuel into the engine. (对/错)答案:对37. The thrust bearing is used to support a rotating shaft. (对/错)答案:错38. The voltmeter is used to measure the electrical voltage in a circuit. (对/错)答案:对39. The gate valve is a type of valve that controls the flow of fluids by rotating a disc. (对/错)答案:错40. The ohmmeter is used to measure the electrical resistance in a circuit. (对/错)四、简答题(每题10分,共20分)41. Explain the function of a thermostat in a machine.答案:A thermostat is a temperature control device that regulates the temperature of a machine by controlling the flow of coolant. It maintains the engine at an optimal operating temperature by opening or closing the cooling system's flow path as needed.42. Describe the purpose of a regulator in an electrical circuit.答案:A regulator in an electrical circuit is a device that maintains a constant voltage level by adjusting the output voltage to compensate for changes in load or input voltage. It ensures that the voltage supplied to the circuit remains stable and within the desired range, preventing damage to sensitive electronic components.。

(完整版)机械专业英语期末考试题及答案,推荐文档

(完整版)机械专业英语期末考试题及答案,推荐文档

机械专业英语期末考试题及答案一.词汇翻译画法几何descriptive geometry机械制图Mechanical drawing投影projection视图view剖视图profile chart标准件standard component零件图part drawing装配图assembly drawing尺寸标注size marking技术要求technical requirements主轴spindle主轴箱headstock卡盘chuck加工中心machining center车刀lathe tool车床lathe钻削镗削bore车削turning磨床grinder基准benchmark钳工locksmith机螺纹thread电一体化mechanotronics mechanical-electrical integration精加工finish machining粗加工rough machining变速箱体gearbox casing表面粗糙度surface roughness二.将下列短语译成汉语1.the fatigue loading(疲劳载荷)2.the radial loads(径向负荷)3.the thrust loads逆负荷4.the ball bearing球轴承5.the roller bearing滚子轴承6.the single-row bearings单沟轴承7.the double-row bearing双沟轴承8.the needle bearing滚针轴承9.the bearing life轴承寿命10.The rating life额定寿命11.the axis of rotation旋转轴12.The helix angle螺旋角13.a right-hand helix 右旋14.a left-hand helix左旋15.an involute helicoids螺旋面16.an involute curve渐开线17.the shaft centerlines轴中心线18.worm gear蜗轮19.the hypoid gear准双曲面齿轮20.right angle直角21.worm gearing蜗杆传动22.the lead angle导角23.shaft angle轴线角度24.bending load弯曲载荷25.tension load张力负荷pression load压缩负载27.torsional load扭转负荷28.the bending moment弯矩29.the bending stress弯曲应力30.30.four-bar linkage(四连杆机构)三.翻译下列句子1. The simplest closed-loop linkage is the four-bar linkage, which has three moving links (plus one fixed link) and four pin joints.(最简单的封闭式的连杆机构就是四杆机构,四杆机构有三个运动构件(加上一个固定构件)并且有四个销轴。

机械专业英语试题及答案

机械专业英语试题及答案

教研室主任 (签字) 学院院长(系主任) (签字)C. degradation…corrosionD. corrosion… degradation12. Most frames _______ cast iron, weld steel, composition, or concrete.A. are made fromB. are made up ofC. was produced byD. was consist of13. Rotating shafts particularly those that run at high speeds, must be designed to avoidoperationat speeds.A . lowB .overload C. critical D. hollow14. Although cast iron is a fairly cheap material, each casting requires a .A. patternB. modelC. moldD. patent15. The term is used to describe joints with surface contact, as with a pin surrounded by a hole.A. high pairB. low pairC. surface pairD. rotary pair二、完型填空(在每个小题四个备选答案中选出一个正确答案,本大题共15小题,每小题1分,总计15分)The term shaft usually refers to a relatively long member of round cross section that rotates and transmits power. One or more members such as gears, sprockets, pulleys, and cams are usually (16) to the shaft by means of pins, keys, splines, snap rings, and other devi ces. These latter members are among the “associated parts” considered in this text, as are couplings and universal joint, which serve to (17) the shaft to the source of power or load.考生注意:考试时间 120 分钟试卷总分 100 分共 5 页第 1 页Sometimes members like gears and cams are made (28) with shaft, butmore often such members (which also include pulleys, sprockets, etc)aremade separately and then(29) shaft. The portion of the mounted memberin contact with the shaft is the hub. Attachment of the hub to the shaftis made in variety of ways. A gear can be gripped (30) between ashoulder on the shaft and a spacer, with torque being transmittedthrough a key. The grooves in the shaft and hub into which the key fitsare called keyways.16、 A) cement B) attached C) connected D) concrete17、 A) endure B) transmit C) serve D) connect18、 A) support B) meet C) satisfy D) strong19、 A) aims B) idler C) terminal D) tomb20、 A) due to B) weather C) whether D) for21、 A) elasticity B) torsional C) inertia D)acceleration22、 A) subjected B)…connect C) and D) From23、 A) deeply B) strength C) clearly understand D)long time24、 A) identify B) cross C) round D)lateral25、 A) lucrative B) objectionable C) attractable D)terrible订线read as follows.Engineering design is the process of devising a system, component, or process to meet desired needs. It is decision making process(often iterative),in which the basic sciences, mathematics, and engineering sciences are applied to convert resources optimally to meet a sated objectives and criteria, synthesis, analysis, construction ,testing, and evaluation. The engineering design component of a curriculum must include most of the following features : development of student creativity, use of open-ended problem statement and use of modern design theory and methodology, formulation of design problem statement and specification, consideration of alternative solutions, feasibility considerations, production process, concurrent engineering design, and detailed system descriptions. Further, it is essential to include a variety of realistic constraints such as economic factors, safety, reliability, aesthetics, ethics, and social impact.31、what’s the main meaning of message (1)?A) Engineering design is a systematic process B) materials engineer’s main workC) mechanical engineer’s has good idea D) electrical engineer’ main duty32、In the author’s opinion, the design process is very complex and should taken intoaccount many factors, from the message who should NOT join into the design team _______.A) environmentalists,B) sociologistsC) engineersD) Government officials33、From the message, we can know the meaning of words “ABET”(at line third paragraph)is _____.A) a set of accredits standardB) a kind of design methodC) a department of US government which responsible for engineering designD) A set of law34、It can be concluded from the passage that in the exercise and training of student,which character of the following is NOT included in the curriculum ______.A) creativityB) new materialC) ethicsD) economic factors35、The title of the message is ______.A) the roles of engineers in manufacturingB) the importance of mechanical designC) engineering designD) The process of machine designTEXT 2Working drawings are the complete set of standardized drawings specifying the manufactureand assembly of a product based on its design. The complexity of the design determines the number and types of drawings. Working drawings may be on more than one sheet and may contain written instructions called specifications.Working drawings are blueprints used for manufacturing products. Therefore, the set of drawings must:(a) completely describe the parts, both visually and dimensionally;(b)show the parts in assembly;(3)identify all the parts; and (4)specify standard parts. The graphics and text information must be sufficiently complete and accurate to manufacture and assemble the product without error.共 5 页第 2页(1) Detail drawings of each nonstandard parts.(2) An assembly or subassembly drawing showing all the standard and nonstandard parts in a single drawing.(3) A bill of materials (BOM).(4) A title block.A detail drawing is a dimensioned, multiview drawing of a single part, describing the part’s shape, size, material, and surface roughness, in sufficient detail for the part to be manufactured based on the drawing alone. Detail drawings are produced from design sketches or extracted from 3-D computer models. They adhere strictly to ANSI standards and the standard for the specific company, for dimensioning, assigning part numbers, notes, tolerances, etc.In an assembly, standard parts such as threaded fasteners and bearings are not drawn as details, but are shown in the assembly view. Standard parts are not drawn as details because they are normally purchased, not manufactured, for assembly.For large assemblies or assembled with large parts, details are drawn on multiple sheets, and a separate sheet is used for the assembly view. If the assembly is simple or the parts are small, detail drawings for each part of an assembly can be placed on a single sheet.Multiple details on a sheet are usually drawn at the same scale. If different scales are used, they are clearly marked under each detail. Also,when more than one detail is placed on a sheet, the spacing between detailsTEXT 3One principle aim of kinematics is to create (design) the desired motions of the subjects’ mechanical parts and then mathematically compute the positions, velocities, and accelerations, which those will create on the parts. Since, for most earthbound mechanical systems, the mass remains essentially constant with time, defining the accelerations as a function of time then also defines the dynamic forces as a function of time. Stresses, in turn, will be a function of both applied and inertial (ma) forces. Since engineering design is charged with creating systems which will not fail during their expected service life, the goal is to keep stresses within acceptable limits for the materials chosen and the environmental conditions encountered. This obviously requires that all system forces be defined and kept within desired limits. In machinery, the largest forces encountered are often those due to the dynamics of the machine itself. These dynamic forces are proportional to acceleration, which brings us back to kinematics, the foundation of mechanical design. Very basic and early decision in the design process involving kinematic principles can be crucial to the success of any mechanical design; a design which has poor kinematics will prove troublesome and perform badly.Any mechanical system can be classified according to the number of degree of freedom (DOF) which it processes. The system’s DOF is equal to the number of independent parameters which are needed to uniquely define its position in space at any instant of time.A rigid body free to move within a reference frame will, in the general case, has complex motion, which is a simultaneous combination of rotation and translation. In three-dimensional space, there may be rotation about any axis and also simultaneous translation which can be resolved into components along three axes. In a plane, or two-dimensional space, complex motion becomes a combination of simultaneous rotation about one axis (perpendicular to theplane) and also translation resolved into components along two axes in the plane41、Kinematics research focus on the following EXCEPT ______..A) accelerations B) forceC) positions, D) velocities42、From the passage that for the design engineer the first and most important is____A) the service life of a machine B) the materials chooseC) the degree of freedom D) kinematic principles43、An mechanical system has uniquely defined position in space at any instant of time that ___.A) It should has one DOFB) It should Has two DOFC) the DOF and the number of independent parameters should equalD) It should has any DOF as want44、 which one of the following is NOT TRUE _______?.A) A rigid body free to move in three-dimensional space may rotation about any axisB) A rigid body free to move in three-dimensional space is a simultaneous combinationof rotation and translationC) A rigid body free to move in three-dimensional space can be resolved into componentsalong three axesD) A rigid body free to move in three-dimensional space may has complex motion45、The best title for this passage would be _______.A) kinematics B) dynamicsC) kinematics and dynamic D) the important of kinematics共 5 页第3 页1.将下列英语句子译成汉语(共5小题,每小题2分)(1)A perfectly rigid or inextensible link can exist only as a textbook type of model of a real machine member.(2)Foundations should ensure the machine’s stiffness; shock absorption and isolation are secondary considerations.(3)Thus, if a mechanical component such as a spring is subjected to repetitive or cyclical applications of stress levels much lower than the ultimate strength, it will fracture after a large number of repetitions of this stress.(4)Interchangeability means that identical parts must be interchangeable, i.e., able to replace each other, whether during assembly or subsequent maintenance work; without the need for any fitting operations.(5)A gear can be gripped axially between a shoulder on the shaft and a spacer, with torque being transmitted through a key.2、将下段英语翻译成汉语(10分)As we look around us we see a world full of “things”, machines, devices, tools, things that we have designed, built, and used; things made of wood, metals, ceramics, and plastics. We know from experience that some things are better than others; they last longer, cost less, are quieter, or are ease to use. Ideally , however, every such item has been designed according to some set of “functional requirements” as perceived by thedesigners—that is, it hs been designed so as to answer the question,(5)当一个装置意外地失效后,通常需要进行研究工作,来找出失效的原因和确定可能的改正措施。

机械英语考试试题及答案

机械英语考试试题及答案

机械英语考试试题及答案一、选择题(每题2分,共20分)1. The term "mechanical engineering" refers to:A. The study of machinesB. The design and manufacture of mechanical systemsC. The operation of machineryD. The maintenance of mechanical equipment答案:B2. What is the function of a bearing in a mechanical system?A. To reduce frictionB. To increase efficiencyC. To provide powerD. To transmit motion答案:A3. The process of converting thermal energy into mechanical energy is known as:A. ElectrificationB. CombustionC. ThermodynamicsD. Hydrodynamics答案:C4. In mechanical design, the principle of "KISS" stands for:A. Keep It Simple, StupidB. Keep It Short and SimpleC. Keep It Simple and SafeD. Keep It Simple, Smart答案:A5. A gear train is used to:A. Change the direction of motionB. Increase the speed of rotationC. Decrease the speed of rotationD. All of the above答案:D6. What does CAD stand for in mechanical engineering?A. Computer-Aided DesignB. Computer-Aided DraftingC. Computer-Aided DevelopmentD. Computer-Aided Diagnostics答案:A7. The SI unit for force is:A. NewtonB. JouleC. PascalD. Watt答案:A8. What is the purpose of a flywheel in a mechanical system?A. To store energyB. To increase speedC. To reduce noiseD. To dissipate heat答案:A9. The term "hydraulics" is associated with the study of:A. Fluid dynamicsB. Solid mechanicsC. Structural analysisD. Thermal engineering答案:A10. The process of cutting a material to a specific shape is known as:A. MachiningB. CastingC. ForgingD. Extrusion答案:A二、填空题(每空1分,共10分)11. The formula for calculating the moment of a force is \( F \times d \), where \( F \) is the force and \( d \) is the_______.答案:distance from the pivot12. A _______ is a device that converts linear motion into rotational motion.答案:crank13. In a four-stroke internal combustion engine, the four strokes are intake, compression, _______, and exhaust.答案:power14. The _______ of a material is its ability to resist deformation under load.答案:stiffness15. The term "overhaul" in mechanical maintenance refers to a thorough inspection and _______ of a machine or its parts.答案:repair16. The _______ of a machine is the study of how forces act on and within a body.答案: statics17. A _______ is a type of machine that uses a screw to convert rotational motion into linear motion.答案:screw jack18. The _______ of a system is the point around which the system rotates.答案:pivot19. The _______ of a lever is the ratio of the effort arm to the load arm.答案:mechanical advantage20. The _______ is a type of bearing that allows for rotation with minimal friction.答案:ball bearing三、简答题(每题5分,共30分)21. Explain the difference between static and dynamic equilibrium in mechanical systems.答案:Static equilibrium refers to a state where the net force and net moment acting on a body are zero, resulting in no acceleration. Dynamic equilibrium occurs when the net force is zero, but the body is in motion with constant velocity.22. What is the purpose of a clutch in a vehicle?答案:A clutch is used to engage and disengage the power transmission from the engine to the transmission system, allowing the vehicle to start, stop, and change gears smoothly.23. Describe the function of a governor in an engine.答案:A governor is a device that automatically controls the speed of an engine by regulating the fuel supply or the valve settings, ensuring the engine operates within safespeed limits.24. What are the three primary types of joints in structural engineering?答案:The three primary types of joints are pinned joints, fixed joints, and sliding joints, each serving different purposes in connecting and supporting structural elements.25. Explain the。

机械专业英语试题及答案

机械专业英语试题及答案

精品文档机械工程专业英语课程考试方式(□闭卷□开卷)课程性质(□必修□限选□任选)一、选择题分,115小题,每小题(在每题四个备选答案中选出一个正确答案,本大题共分)总计15planar undergoes the system linkage move in parallel planes 1. If all points in a.motion and the linkage may be described as aD. slide B. planar linkage C. joints A. planar motion sometimes are Though 2. frame material and design should handle damping, built into frame sections to handle specific problems.D. screwC. dampers A .beams B. holesThe maximum allowable deflection of a shaft ______ determined by critical speed, 3. gear, or bearing requirements.D. is usually C. was B. must A. oftenmore generate solutions as we to _____ to better and better 4. We will have information.D. try ways B. iterating C. iterate A. repeat many timesdetermine to then examined configuration is _______ specified and 5. If a product whether the performance requirements are met.D. have beenC. temporary B. tentatively A. finallyManufacturing can be defined as the _____ of raw materials into useful products 6. through the use of the easiest and lest-expensive methods.D. transformingC. process B. processing A. transformation7. The planer and knee types of milling machine is _____ because of its flexibility.B. most popular A. used most commonlyD. most powerfulC. the most commonly usedforce _____ frequency of the vibrate result, the system will at the 8. As a regardless of the initial conditions or natural frequency of the system.D. actC. out B. excitation A. actionthe between the relationship components are assembled together, Before 9. two dimensions of the mating surfaces_______.should printed clearlyB. A. must be giving outC. must be specifiedD. should be clearly noted10. The main practical advantage of lower pairs is their better ability to trap lubricant between their ______ surfaces.D. outsideA. envelopingB. matingC. outer11. The word______ itself usually refers to the deterioration of metals and ceramics, while similar phenomena in plastics generally called ______.A. recrystallization…. corrosionB. recrystallization…degradation精品文档.精品文档D. corrosion…degradation C. degradation…corrosion12. Most frames _______ cast iron, weld steel, composition, or concrete.B. are made up ofA. are made fromD. was consist ofC. was produced by13. Rotating shafts particularly those that run at high speeds, must be designed to avoid operationspeeds.atD. hollow C. critical B .overload A . low.14. Although cast iron is a fairly cheap material, each casting requires aD. patentC. mold B. model A. patternis used to describe joints with surface contact, as with a pin surrounded by a hole.15. The termD. rotary pair C. surface pair B. low pair A. high pair15分)二、完型填空(在每个小题四个备选答案中选出一个正确答案,本大题共15小题,每小题1分,总计The term shaft usually refers to a relatively long member of round cross section that rotates andtransmits power. One or more members such as gears, sprockets, pulleys, and cams are usually (16)to the shaft by means of pins, keys, splines, snap rings, and other devices. These latter members areamong the “associated parts”considered in this text, as are couplings and universal joint, which servethe shaft to the source of power or load.to (17)A shaft can have a noround cross section, ant it need not necessarily rotate. It can be stationary anda rotating member, such as the short shafts that support the nondriving wheels of an serve to (18)(20) depending on automobile. The shafts supporting(19) gears can be either rotating or stationarythe gear is attached to the shaft or supported by it through bearings.of shafts can be subjected to various combinations axial, bending, and(21) that It isapparentloads, and that these loads may be static or fluctuating. Typically, a rotating shaft transmitting power isreversed a completely together a mean torsional stress) with a (22) to constant torque (producingbending load (producing an alternating bending stress).requirements, shafts must be designed so that deflections are within In addition to satisfying (23)cause (25) deflection acceptable limits. Excessive (24) shafts can hamper gear performance andbearings(either noise. The associated angular deflection can no-self- aligning be very destructive tomechanism. gear driven cam the can affect accuracy of a or or plain rolling). (26) deflectioncorresponding lower the (27) or the Furthermore, the greater flexibility -either lateral torsional-thespeed.100 试卷总分分钟120 考试时间考生注意:分页5 共1 第页精品文档.精品文档Sometimes members like gears and cams are made (28) with shaft, but moreoften such members (which also include pulleys, sprockets, etc)are made separately and then(29) shaft. The portion of the mounted member in contactwith the shaft is the hub. Attachment of the hub to the shaft is made invariety ofways. A gear can be gripped (30) between a shoulder on the shaft and a spacer, with torque being transmitted through a key. The grooves in the shaft and hub intowhich the key fits are called keyways.班级attached C) connected B) D) concrete 16、A) cement connect D) C) serve 17、A) endure B) transmitsupport B) meet C) satisfy 18、A) D) strong 学号idler C) terminal 19、A) aims B) D) tomb装whether C) D) for20、A) due to B) weather torsional C) inertia 21、A) elasticity B) D) accelerationsubjected B)…connect C) and 、A) D) From22姓名strength C) clearly understand 23、A) deeply B) D) long time lateral D) C) round 24、A) identify B) cross objectionable C) attractable B) D) terrible 25、A) lucrativeTorsional D) Movement C) 26、A) Moment B)Tormentcritical C) first B) D) important 27、A) highintegral C) D) simplification 、A) work B) idealization 28 mounted onto B) refers C) referring to 29、A) D) indicatesaxially D) 30、A) deformations B) bending limits C) laternal 订三、阅读理解(在每个小题四个备选答案中选出一个正确答案,填在题头的表中)(本大题共20小题,每小题2分,总计40分)Text 1Engineering design is a systematic process by which solution to the needs of humankind are obtained .The process is applied to problems(needs) of varying complexity .For example, mechanical engineers will use the design process to find an effective, efficient method to convert reciprocating motion to circular motion for the drive train in an intnternal combustion engine; electrical engineers will use the process to design electrical generating systems using falling wateras the power source; and materials engineers use the process to design ablative materials whichenable astronauts to safely reenter the earth's atmosphere.线The vast majority of complex problems in today's high technology society depend for solutionnot on a single engineering discipline, but on teams of engineers, scientists, environmentalists, economists, sociologists, and legal personnel. Solutions are not only dependent regulations and political influence. As engineers we are empowered with the technical expertise to develop new and improved products and systems, but at the same time we must be increasingly aware of the impactof our actions on society and the environment in general and work conscientiously toward the best solution in view of all relevant factors.Design is the culmination of engineering educational process; it is the salient feature thatdistinguishes engineering design is found in the curriculum guidelines of the Accreditation Boardfor Engineering and Technology(ABET).ABET accredits curricula in engineering schools andderives its membership from the various engineering professional societies. Each accredited curriculum has a well-defined design component which falls within the ABET statement on design精品文档.精品文档read as follows.Engineering design is the process of devising a system, component, or process to meet desired needs. It is decision makingprocess(often iterative),in which the basic sciences, mathematics, and engineering sciences are applied to convert resourcesoptimally to meet a sated objectives and criteria, synthesis, analysis, construction ,testing, and evaluation. The engineeringdesign component of a curriculum must include most of the following features : development of student creativity, use ofopen-ended problem statement and use of modern design theory and methodology, formulation of design problem statementand specification, consideration of alternative solutions, feasibility considerations, production process, concurrent engineeringdesign, and detailed system descriptions. Further, it is essential to include a variety of realistic constraints such as economicfactors, safety, reliability, aesthetics, ethics, and social impact.31、what's the main meaning of message (1)?A) Engineering design is a systematic process B) materials engineer's main workC) mechanical engineer's has good idea D) electrical engineer' main duty32、In the author's opinion, the design process is very complex and should taken into account many factors, from themessage who should NOT join into the design team _______.A) environmentalists,B) sociologistsC) engineersD) Government officials33、From the message, we can know the meaning of words “ABET”(at line third paragraph) is _____.A) a set of accredits standardB) a kind of design methodC) a department of US government which responsible for engineering designD) A set of law34、It can be concluded from the passage that in the exercise and training of student, which character of the following isNOT included in the curriculum ______.A) creativityB) new materialC) ethicsD) economic factors35、The title of the message is ______.A) the roles of engineers in manufacturingB) the importance of mechanical designC) engineering designD) The process of machine designTEXT 2Working drawings are the complete set of standardized drawings specifying the manufacture and assembly of a productbased on its design. The complexity of the design determines the number and types of drawings. Working drawings may be onmore than one sheet and may contain written instructions called specifications.Working drawings are blueprints used for manufacturing products. Therefore, the set of drawings must:(a) completelydescribe the parts, both visually and dimensionally;(b)show the parts in assembly;(3)identify all the parts; and (4)specifystandard parts. The graphics and text information must be sufficiently complete and accurate to manufacture and assemble theproduct without error.共5 页第 2 页精品文档.精品文档Generally, a complete set of Working drawings for an assembly includes:(1) Detail drawings of each nonstandard parts.(2) An assembly or subassembly drawing showing all the standard and nonstandard parts in a single drawing.(3) A bill of materials (BOM). (4) A title block.A detail drawing is a dimensioned, multiview drawing of a single part, describing the part's shape, size, material, and surface roughness, in sufficient detail for the part to be manufacturedbased on the drawing alone. Detail drawings are produced from design sketches or extracted from 3-D computer models. They adhere strictly to ANSI standards and the standard for the specific company, for dimensioning, assigning part numbers, notes, tolerances, etc. In an assembly, standard parts such as threaded fasteners and bearings are not drawn as details, but are shown in the assembly view. Standard parts are not drawn as details because they are normally purchased, not manufactured, for assembly.For large assemblies or assembled with large parts, details are drawn on multiple sheets, and a separate sheet is used for the assembly view. If the assembly is simple or the parts are small, detaildrawings for each part of an assembly can be placed on a single sheet.Multiple details on a sheet are usually drawn at the same scale. If different scales are used,they are clearly marked under each detail. Also, when more than one detail is placed on a sheet, the spacing between details is carefully planned, including leaving sufficient room for dimensions and notes.36. Based on the message, which of the follow is wrong?订A) standard parts needn't drawn as detailsB) for simple parts, sometimes needn't to draw the detail working drawingC) for large assemblies details may drawn on multiple sheetsD) If different scales used in a single sheet, they should clearly marked under each detail37. Working drawings for an assembly MAY NOT includes: ?A) BOM B) title blockC) An assembly or subassembly drawing D) Detail drawings of all parts.38. For detail drawing, Which one of the following statement is not true ?A) should not has different scalesB) Detail drawing can produced from design sketches or extracted from 3-D computermodels.线C) detail drawing is a dimensioned, multiview drawing of a single partD) should Adhere strictly to ANSI standards39. From the message we can infer ANSI is ?A) a set of law B) a set of notificationC) an Organization D) IEEE government40. The topic of the message is ?A) How to design working drawings.B) working drawing's character and the key influence of how to draw a working drawingC) In the design process, what should be considered?What is working drawing D)精品文档.精品文档TEXT 3One principle aim of kinematics is to create (design) the desired motions of the subjects' mechanicalparts and then mathematically compute the positions, velocities, and accelerations, which those will create onthe parts. Since, for most earthbound mechanical systems, the mass remains essentially constant with time,defining the accelerations as a function of time then also defines the dynamic forces as a function of time.Stresses, in turn, will be a function of both applied and inertial (ma) forces. Since engineering design ischarged with creating systems which will not fail during their expected service life, the goal is to keepstresses within acceptable limits for the materials chosen and the environmental conditions encountered. Thisobviously requires that all system forces be defined and kept within desired limits. In machinery, the largestforces encountered are often those due to the dynamics of the machine itself. These dynamic forces areproportional to acceleration, which brings us back to kinematics, the foundation of mechanical design. Verybasic and early decision in the design process involving kinematic principles can be crucial to the success ofany mechanical design; a design which has poor kinematics will prove troublesome and perform badly.Any mechanical system can be classified according to the number of degree of freedom (DOF) which itprocesses. The system's DOF is equal to the number of independent parameters which are needed touniquely define its position in space at any instant of time.A rigid body free to move within a reference frame will, in the general case, has complex motion, whichis a simultaneous combination of rotation and translation. In three-dimensional space, there may be rotationabout any axis and also simultaneous translation which can be resolved into components along three axes. Ina plane, or two-dimensional space, complex motion becomes a combination of simultaneous rotation aboutone axis (perpendicular to the plane) and also translation resolved into components along two axes in theplane41、Kinematics research focus on the following EXCEPT ______..A) accelerations B) forceC) positions, D) velocities42、From the passage that for the design engineer the first and most important is____A) the service life of a machine B) the materials chooseC) the degree of freedom D) kinematic principles43、An mechanical system has uniquely defined position in space at any instant of time that ___.A) It should has one DOFB) It should Has two DOFC) the DOF and the number of independent parameters should equalD) It should has any DOF as want44、which one of the following is NOT TRUE _______?.A) A rigid body free to move in three-dimensional space may rotation about any axisB) A rigid body free to move in three-dimensional space is a simultaneous combination of rotationand translationC) A rigid body free to move in three-dimensional space can be resolved into components alongthree axesD) A rigid body free to move in three-dimensional space may has complex motion45、The best title for this passage would be _______.A) kinematics B) dynamicsC) kinematics and dynamic D) the important of kinematics共5 页第 3 页精品文档.精品文档四、英译汉(共20分)1.将下列英语句子译成汉语(共5小题,每小题2分)A perfectly rigid or inextensible link can exist only as a textbook type of model of )1(a real machine member.Foundations should ensure the machine's stiffness; shock absorption and isolation )(2are secondary considerations.cyclical or spring a mechanical component such as a is subjected to repetitive Thus, (3)if large after a strength, of applications stress levels much lower than the ultimate it will fracture number of repetitions of this stress.Interchangeability means that identical parts must be interchangeable, i.e., able to replace each 4)(other, whether during assembly or subsequent maintenance work; without the need for any fitting operations.A gear can be gripped axially between a shoulder on the shaft and a spacer, with )(5torque being transmitted through a key.分)、将下段英语翻译成汉语(102As we look around us we see a world full of “things”, machines, devices, tools, things that we 订have designed, built, and used; things made of wood, metals, ceramics, and plastics. We know from experience that some things are better than others; they last longer, cost less, are quieter, or are easeto use. Ideally , however, every such item has been designed according to some set of “functional the answer to been that designers—is, it hs designed so as perceived requirements”as by themajor engineering, the world In it “exactly question, what function should perform?”the of function frequently is to support some type of loading due to weight, inertia , pressure, etc.五、英译汉(共20分)1、将下列分)25小题,每小题句子译成英语(共一个或多个诸如齿轮,链轮,皮带轮和凸轮等类的构件通常借助于销、键、)(1 线花键、卡环或其它装置连接到轴上。

英语机械制造英语30题

英语机械制造英语30题

英语机械制造英语30题1. In mechanical manufacturing, a "lathe" is used for _____.A. cuttingB. grindingC. turningD. drilling答案:C。

本题考查机械制造中“lathe”(车床)的用途。

选项A“cutting”((切割)通常不是车床的主要功能;选项B“grinding”((磨削)一般由磨床完成;选项C“turning”(车削)是车床的主要操作;选项D“drilling”(钻孔)通常由钻床进行。

2. The part of a machine that transmits power is called a _____.A. gearB. shaftC. bearingD. pulley答案:B。

在机械制造中,传递动力的部件被称为“shaft”(轴)。

选项A“gear”((齿轮)主要用于改变转速和扭矩;选项C“bearing”((轴承)用于支撑旋转部件;选项D“pulley”(滑轮)主要用于改变力的方向或传递动力,但不是直接传递动力的主要部件。

3. Which of the following tools is used for measuring dimensions accurately in mechanical manufacturing?A. RulerB. CaliperC. ProtractorD. Compass答案:B。

在机械制造中,精确测量尺寸的工具是“Caliper”(卡尺)。

选项A“Ruler”((尺子)精度相对较低;选项C“Protractor”((量角器)用于测量角度;选项D“Compass”((圆规)主要用于绘制圆和圆弧。

4. The process of shaping a metal by applying pressure is called _____.A. castingB. forgingC. weldingD. milling答案:B。

机械工程英语考试题及答案

机械工程英语考试题及答案

机械工程英语考试题及答案一、选择题(每题2分,共20分)1. The term "mechanical engineering" refers to the field that deals with the design, construction, and maintenance of machines.A. TrueB. False答案:A2. Which of the following is not a type of machine element?A. GearB. PistonC. LeverD. Circuit答案:D3. The study of forces and their effects on the motion of objects is known as:A. ThermodynamicsB. MechanicsC. Fluid dynamicsD. Electromagnetism答案:B4. In mechanical engineering, what is the SI unit for torque?A. Newton-meter (Nm)B. Pascal (Pa)C. Joule (J)D. Watt (W)答案:A5. What is the process of converting electrical energy into mechanical energy called?A. ElectromagnetismB. ElectrolysisC. Electromechanical conversionD. Electrostatics答案:C6. A system of units based on the meter, kilogram, and second is known as the:A. CGS systemB. FPS systemC. SI systemD. MKS system答案:C7. What is the primary function of a bearing in a mechanical system?A. To reduce frictionB. To increase frictionC. To generate heatD. To store energy答案:A8. The process of removing material from a workpiece to achieve the desired shape and size is called:A. CastingB. MachiningC. WeldingD. Annealing答案:B9. Which of the following materials is not typically used in mechanical engineering?A. SteelB. PlasticC. ConcreteD. Rubber答案:C10. The study of the behavior of materials under various types of applied loads is known as:A. Material scienceB. Structural engineeringC. Civil engineeringD. Mechanical engineering答案:A二、填空题(每题2分,共20分)1. The ________ is a device that converts the rotational motion of an engine into linear motion.答案:piston2. A ________ is a mechanical device that can multiply force or distance.答案:lever3. The ________ is the point where all forces acting on a body act.答案:center of gravity4. A ________ is a type of machine that uses a rotating shaft to apply torque to a workpiece.答案:lathe5. The ________ is a measure of the resistance of a material to deformation.答案:stiffness6. ________ is the process of joining two or more pieces of metal by melting and fusing them together.答案:welding7. A ________ is a machine that uses a rotating blade to move or lift substances.答案:pump8. ________ is the study of the strength and properties of materials.答案:material science9. ________ is the process of changing the shape or size of a material by applying force.答案:deformation10. ________ is the process of removing material from a workpiece by cutting.答案:machining三、简答题(每题10分,共40分)1. Explain the difference between static and dynamic equilibrium in mechanical systems.答案:Static equilibrium refers to a state where all forces acting on a body are balanced, resulting in no acceleration. Dynamic equilibrium occurs when the net force acting on abody is zero, but the body is still moving at a constant velocity.2. Describe the function of a gearbox in a mechanical system. 答案:A gearbox is a mechanical device that transmits power from a prime mover to a machine by converting rotationalspeed and torque. It changes the speed and torque of theinput shaft to the output shaft, allowing for different operating speeds and torques in various applications.3. What are the three main types of stress that a materialcan experience?答案:The three main types of stress are tensile stress, compressive stress, and shear stress. Tensile stress occurs when a material is pulled apart, compressive stress occurs when a material is compressed, and shear stress occurs when two parallel planes of a material slide past each other.4. Explain the concept of power in mechanical engineering.答案:Power in mechanical engineering is the rate at which work is done or energy is transferred. It is the product of force and velocity, and it is typically measured in watts (W). Power can be calculated as the work done per unit time, andit is an important parameter in the design and operation of mechanical systems.。

机械工程英语试题及答案

机械工程英语试题及答案

机械工程英语试题及答案一、选择题(每题2分,共20分)1. What is the function of a bearing in a mechanical system?A. To support the shaftB. To reduce frictionC. Both A and BD. None of the above2. The term "machinability" refers to:A. The ease with which a material can be machinedB. The hardness of the materialC. The cost of machining a materialD. The strength of the material3. Which of the following is NOT a type of gear?A. Spur gearB. Bevel gearC. Worm gearD. Cam gear4. The process of converting electrical energy into mechanical energy is known as:A. ElectromagnetismB. Electromechanical conversionC. Electromagnetic inductionD. Electrostatics5. What is the primary purpose of a flywheel in an engine?A. To store energyB. To increase fuel efficiencyC. To reduce vibrationsD. To increase horsepower6. The SI unit for pressure is:A. NewtonB. PascalC. JouleD. Watt7. In a hydraulic system, what does the term "pump" refer to?A. A device that generates hydraulic pressureB. A device that reduces hydraulic pressureC. A device that converts hydraulic pressure to mechanical forceD. A device that regulates hydraulic flow8. What is the main advantage of using a belt drive in a mechanical system?A. High efficiencyB. Low maintenanceC. High precisionD. Compact size9. The term "thermal expansion" refers to the:A. Increase in volume of a material when heatedB. Decrease in volume of a material when cooledC. Change in shape of a material due to heatD. Change in color of a material due to heat10. Which of the following is a measure of the hardness of a material?A. Tensile strengthB. Yield strengthC. Modulus of elasticityD. Brinell hardness二、填空题(每题1分,共10分)11. The _______ is the process of removing material from a workpiece to achieve the desired shape and size.(答案:Machining)12. In a four-stroke internal combustion engine, the _______ stroke converts the chemical energy of the fuel into mechanical energy.(答案:Power)13. The _______ is the study of the behavior of materials under load.(答案:Mechanics of materials)14. A _______ is a mechanical device that converts the linear motion of a piston into the rotational motion of a crankshaft. (答案:Crank)15. The _______ is the ratio of the output power to the input power of a machine.(答案:Efficiency)16. _______ is the process of joining two or more metal parts by heating them to their melting point and fusing themtogether.(答案:Welding)17. The _______ is a type of gear that has teeth cut diagonally rather than parallel to the axis of the gear.(答案:Hypoid gear)18. _______ is the process of cutting a workpiece by feeding it against a rotating abrasive disk.(答案:Grinding)19. The _______ is the study of the deformation and flow of materials under various forces.(答案:Rheology)20. _______ is the process of shaping a workpiece by pressing it between a punch and a die.(答案:Forging)三、简答题(每题5分,共30分)21. Explain the difference between static and dynamic friction.(答案:Static friction is the frictional force that must be overcome to start moving an object, while dynamic friction is the frictional force that opposes the motion of an object that is already in motion.)22. Describe the function of a clutch in a vehicle.(答案:A clutch is a device that engages and disengages power transmission from the engine to the transmission, allowing the driver to change gears smoothly.)23. What is the purpose of a heat exchanger in a mechanical system?(答案:A heat exchanger is used to transfer heat from one medium to another, typically to cool a system or to preheat a fluid before it enters the system.)24. Explain the concept of stress and strain in materials.(答案:Stress is the internal resistance of a material to deformation when subjected to an external force, while strain is the measure of the deformation of the material under stress.)四、计算题(。

机械英语试题及答案解析

机械英语试题及答案解析

机械英语试题及答案解析1. 机械设计中,"bearing"指的是什么?A. 轴承B. 齿轮C. 轴D. 联轴器答案:A解析:在机械英语中,"bearing"指的是轴承,它是一种允许相对运动的机械元件,用于减少运动过程中的摩擦,并支撑机械旋转体,以保持其正确的位置。

2. 什么是"mechanical advantage"?A. 机械效率B. 机械优势C. 机械功率D. 机械能答案:B解析:"Mechanical advantage"指的是机械优势,它是一个描述机械装置能够放大输入力的倍数的术语。

机械优势越高,所需的输入力就越小,从而可以更轻松地移动或举起重物。

3. "Gears"在机械英语中是什么意思?A. 齿轮B. 链条C. 皮带D. 滑轮答案:A解析:"Gears"在机械英语中指的是齿轮,它们是轮状的机械零件,边缘有齿,可以相互啮合以传递运动和动力。

齿轮在各种机械系统中用于改变速度和扭矩。

4. "Torque"在机械中代表什么?A. 扭矩B. 压力C. 拉力D. 重力答案:A解析:"Torque"在机械中代表扭矩,它是衡量旋转力的量度,表示为力与力臂(力的作用点到旋转轴的距离)的乘积。

扭矩是使物体绕轴旋转的力。

5. "Hydraulic system"是什么类型的系统?A. 电气系统B. 液压系统C. 气动系统D. 热力系统答案:B解析:"Hydraulic system"指的是液压系统,它是一种利用流体(通常是油)的压力来传递能量的系统。

液压系统广泛应用于各种工业机械中,用于执行精确的线性或旋转运动。

6. "Pneumatic system"与"hydraulic system"的主要区别是什么?A. 一个使用气体,一个使用液体B. 一个用于提升重物,一个用于快速移动C. 一个用于精确控制,一个用于大范围运动D. 一个用于高温环境,一个用于低温环境答案:A解析:"Pneumatic system"指的是气动系统,它使用压缩空气作为动力源来驱动各种机械装置。

机械英语试题及答案高中

机械英语试题及答案高中

机械英语试题及答案高中一、选择题(每题2分,共20分)1. Which of the following is not a type of mechanical motion?A. Translational motionB. Rotational motionC. Vibrational motionD. Electromagnetic motion2. The term "mechanical advantage" refers to:A. The force required to move an objectB. The ratio of output force to input forceC. The speed at which an object movesD. The efficiency of a machine3. In a simple machine, the ideal mechanical advantage of a lever is determined by:A. The length of the lever armB. The weight of the object being liftedC. The distance between the fulcrum and the loadD. The material used to make the lever4. What is the primary function of a pulley system?A. To change the direction of forceB. To increase the speed of movementC. To reduce the amount of force neededD. To decrease the distance over which force is applied5. A wheel and axle is a type of simple machine that:A. Amplifies forceB. Changes the direction of forceC. Increases speedD. Decreases efficiency6. The principle of conservation of energy states that:A. Energy can be created or destroyedB. Energy is always conserved in a closed systemC. Energy can only be transformed from one form to anotherD. Energy is lost during mechanical processes7. In mechanics, the term "work" is defined as:A. The force applied to an objectB. The distance an object is movedC. The product of force and the distance moved in the direction of the forceD. The rate at which energy is transferred8. The unit of work in the International System of Units is:A. JouleB. NewtonC. WattD. Pascal9. The law of inertia states that an object at rest will:A. Stay at rest unless acted upon by an external forceB. Move at a constant velocity unless acted upon by an external forceC. Accelerate in the direction of the applied forceD. Decelerate when no force is applied10. According to Newton's third law of motion, for every action, there is an equal and opposite:A. ForceB. MassC. MomentumD. Energy二、填空题(每题2分,共20分)1. The sum of all external forces acting on an object is known as ________.2. When an object is in equilibrium, the net force acting on it is ________.3. The unit of force in the International System of Units is the ________.4. The principle that states objects in motion tend to stay in motion and objects at rest tend to stay at rest is known as ________.5. The formula for calculating the work done by a constant force is ________.6. The formula for calculating the power is ________.7. The principle that states the forces of action and reaction between two bodies are equal and opposite is known as ________'s third law of motion.8. A machine that consists of a wheel and a rope wrapped around it is called a ________.9. The mechanical advantage of a simple machine is always________ than 1.10. The conservation of energy principle implies that energy cannot be ________ or destroyed.三、简答题(每题10分,共20分)1. Explain the difference between translational androtational motion.2. Describe how a pulley system can be used to lift a heavy object with less force.四、计算题(每题15分,共30分)1. A force of 50 N is applied to a lever with a mechanical advantage of 3. Calculate the output force.2. If a machine has an efficiency of 80% and requires an input power of 120 W to lift a 200 kg object at a constant speed, calculate the work done on the object.答案:一、选择题1. D2. B3. A4. C5. B6. B7. C8. A9. A 10. A二、填空题1. Net force2. Zero3. Newton4. Law of inertia5. Work = Force × Distance6. Power = Work / Time7. Newton8. Pulley9. Greater 10. Created三、简答题1. Translational motion refers to the movement of an object where every point on the object moves the same distance in the same direction. Rotational motion is when an object turns around a central point or axis, with each point on the object moving in a circular path.2. A pulley system can be used to lift a heavy object。

机械原理英文试题及答案

机械原理英文试题及答案

机械原理英文试题及答案1. What is the primary function of a governor in a mechanical system?A. To regulate the speed of the systemB. To increase the power outputC. To reduce frictionD. To provide lubricationAnswer: A2. In a four-bar linkage, which of the following is true?A. There are four bars connected by revolute jointsB. It is a type of lever systemC. It is a type of gear systemD. It always forms a closed loopAnswer: A3. What does the term "kinematic chain" refer to in mechanics?A. A series of interconnected linksB. A chain used for lifting heavy loadsC. A chain used in power transmissionD. A chain used for timing mechanismsAnswer: A4. Which of the following is a type of simple machine?A. PulleyB. GearC. EngineD. MotorAnswer: A5. What is the purpose of a flywheel in a mechanical system?A. To store energyB. To increase the speed of rotationC. To reduce frictionD. To provide lubricationAnswer: A6. In the context of mechanical advantage, what does the term "mechanical efficiency" refer to?A. The ratio of output power to input powerB. The ratio of output force to input forceC. The ratio of output torque to input torqueD. The ratio of output speed to input speedAnswer: A7. What is the purpose of a clutch in a mechanical system?A. To transmit powerB. To engage or disengage power transmissionC. To regulate the speed of the systemD. To provide lubricationAnswer: B8. What is the primary function of a belt drive in a mechanical system?A. To transmit powerB. To increase the speed of rotationC. To reduce frictionD. To provide lubricationAnswer: A9. In a lever system, what is the term for the point around which the lever rotates?A. Focal pointB. Center of massC. Fulfillment pointD. FulcrumAnswer: D10. What is the primary function of a cam in a mechanical system?A. To convert rotational motion to linear motionB. To increase the speed of rotationC. To reduce frictionD. To provide lubricationAnswer: A。

机械专业英语试题含答案

机械专业英语试题含答案

2010-2011第二学期专业英语试卷A答案l.Translate the following Chinese terms into English ( one point for each,20 points for all)1)汽车与工程机械automobile and construction machinery2)筑路机械road-making machine3)发电机generator4)起动马达self starter5)方向盘steering wheel6)进气门inlet valve7)齿轮泵gear pump8)机油滤清器oil filter9)差速器differential10)摩擦式离合器friction clutch11)蓄电瓶storage battery12)铲土运输机scraper13)塔式起重机tower crane14)叉车fork lift15)商业车辆commercial vehicle16)变速箱transmission box (gear box)17)带式输送机belt conveyer18)步履式挖掘机walking excavator19)颚式砸机jaw crusher20)履带和轮胎track and tire2.Translate the following English terms into Chinese (one point foreach, total 20 points)1)gasoline and diesel2)flywheel and cam3)disk brake4)mechanical vibration5)power steering6)vibratory roller7)hydraulic torque converter8)piston ring9)suspension system10)cab and chassis11)radiator12)fuel-injection system13)air compressor14)lubrication and lubricant汽油和柴油飞轮和凸轮盘式制动器机械振动动力转向振动式压路机液力变矩器活塞环悬挂系统驾驶室与底盘散热器燃油喷射系统空气压缩机润滑与润滑剂15)fine-mesh oil filter 机油细滤器16)pile driver 打桩机17)hydraulic excavator 液压挖掘机18)concrete paver 混凝土摊铺机19)truck mixer 搅拌车20)ignition system 点火系统3.Answer the following questions briefly(5 points for each, 20 pointsfor all)1)Which are included in an internal combustion engineTwo mechanisms:piston connecting rod mechanism and valve timing mechanismFive systems :fuel feed system,lubrication system,cooling system,starting system,and ignition system (only for petrol engine).2)What are included in a working member of a hydrauli excavator?Boom,arm,bucket and cylinder of the boom,cylinder of the arm,cylinder of the bucket.3)What is the function of a differential ?The differentials is a gear assembly in a motor vehicle which allows the propeller shaft or drive shaft to turn the drive wheels at different speed when the vehicle is going around a curve.4)What is the difference between a bulldozer and an angledozer?A bulldozer is mounted with a blade perpendicular to the direction of travel. And an angle dozeris mounted with a blade set an angle with the direction of travel. The former pushes the earth forward, while the latter pushes the earth forward and to one side, some blades may be adjusted their use to bulldozer or angledozer.4.Translate the following sentences into Chinese. (40 points)A.Part One (5 points for each , 20 points for all)第一部分1)真正最早上市的内燃机是名叫尼古拉斯•奥格斯特•奥托的德国人发明的。

机械专业英语试题及答案

机械专业英语试题及答案

机械专业英语试题及答案一、词汇题(每题1分,共10分)1. The process of changing a solid object into a liquid by heating is called ________.A. meltingB. evaporationC. condensationD. solidification答案:A2. A device that converts thermal energy into mechanical energy is known as a ________.A. engineB. generatorC. turbineD. pump答案:A3. The study of the forces and motion of objects is called ________.A. physicsB. mechanicsC. thermodynamicsD. fluid dynamics答案:B4. A machine that uses a rotating wheel to lift water is called a ________.A. pumpB. wheelC. turbineD. lever答案:A5. The process of removing heat from a substance is called ________.A. heatingB. coolingC. insulationD. refrigeration答案:D6. The science of measuring the properties of materials is called ________.A. metrologyB. material scienceC. thermodynamicsD. mechanics答案:A7. A machine that uses a pivot point to multiply force is called a ________.A. leverB. pulleyC. wheel and axleD. inclined plane答案:A8. The process of making a solid object by heating a liquidis called ________.A. meltingB. evaporationC. condensationD. solidification答案:D9. A machine that uses a belt and pulley system to transmit motion is called a ________.A. leverB. pulleyC. wheel and axleD. inclined plane答案:B10. The study of the behavior of materials under stress is called ________.A. mechanicsB. material scienceC. thermodynamicsD. fluid dynamics答案:B二、阅读理解(每题2分,共20分)阅读以下段落,并回答问题。

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机械专业英语期末考试题及答案一.词汇翻译画法几何descriptive geometry机械制图Mechanical drawing投影projection视图view剖视图profile chart标准件standard component零件图part drawing装配图assembly drawing尺寸标注size marking技术要求technical requirements主轴spindle主轴箱headstock卡盘chuck加工中心machining center车刀lathe tool车床lathe钻削镗削bore车削turning磨床grinder基准benchmark钳工locksmith机螺纹thread电一体化mechanotronics mechanical-electrical integration精加工finish machining粗加工rough machining变速箱体gearbox casing表面粗糙度surface roughness二.将下列短语译成汉语1.the fatigue loading(疲劳载荷)2.the radial loads(径向负荷)3.the thrust loads逆负荷4.the ball bearing球轴承5.the roller bearing滚子轴承6.the single-row bearings单沟轴承7.the double-row bearing双沟轴承8.the needle bearing滚针轴承9.the bearing life轴承寿命10.The rating life额定寿命11.the axis of rotation旋转轴12.The helix angle螺旋角13.a right-hand helix 右旋14.a left-hand helix左旋15.an involute helicoids螺旋面16.an involute curve渐开线17.the shaft centerlines轴中心线18.worm gear蜗轮19.the hypoid gear准双曲面齿轮20.right angle直角21.worm gearing蜗杆传动22.the lead angle导角23.shaft angle轴线角度24.bending load弯曲载荷25.tension load张力负荷pression load压缩负载27.torsional load扭转负荷28.the bending moment弯矩29.the bending stress弯曲应力30.30.four-bar linkage(四连杆机构)三.翻译下列句子1. The simplest closed-loop linkage is the four-bar linkage, which has three moving links (plus one fixed link) and four pin joints.(最简单的封闭式的连杆机构就是四杆机构,四杆机构有三个运动构件(加上一个固定构件)并且有四个销轴。

)2. Although the four-bar linkage and slider-crank mechanism are very useful and found in thousands of applications, we can see that these linkages have limited performance level.(虽然四杆机构和曲柄滑块机构是非常有用而且在成千上万的应用中都可找到。

但是我们还看到,这些连杆机构其性能水平的发挥已经受到限制。

)3. The process of drawing kinematic diagrams and determining degrees of freedom ofmechanisms are the first steps in both the kinematic analysis and synthesis process.(画运动图和确定机构自由度的过程,就是运动分析和综合过程的第一个阶段。

)4. The ability to visualize relative motion, to reason why a mechanism is designed the way it is, and the ability to improve on a particular design are marks of a successfulkinematician.(设想相对运动的能力,能推想出之所以这样设计一个机构的原因和对一个具体设计进行改进的能力是一个成功的机构学家的标志。

)5.Kinematic inversion is the process of fixing different links of a chain to create different mechanisms.(这个过程的动态反演是固定的,不同的连接创造出不同的机制。

)四.翻译下列短文1.A kinematic chain is a system of links, that is, rigid bodies, which are either jointed together or are in contact with one another in a manner that permits them to move relative to one another. If one of the links is fixed and the movement of any other link to a new position will cause each of the other links to move to definite predictable position, the system is a constrained kinematic chain. If one of the links is held fixed and the movement of any other link to a new position will not cause each of the other links to move to a definite predictable position, then the system is an unconstrained kinematic chain.(运动链是一个构件系统装置即若干个刚体,它们或者彼此铰接或者互相接触,方式上是允许它们彼此间产生相对运动。

如果构件中的某一构件被固定而使任何其他一个构件运动到新的位置将会引起其他各个构件也运动到确定的预期的位置上的话,该系统装置就是一个可约束的运动链。

如果构件中的某一构件仍保持固定而使任一运动到达一新的位置而不会使其他各个构件运动到一个确定的预期的位置上的话,则该系统装置是一个非约束运动链。

)2. A mechanism or linkage is a constrained kinematic chain, and is a mechanical device that has the purpose of transferring motion and/or force from a source to an output. A linkage consists of links (or bars), generally considered rigid, which are connected by joints, such as pin (or revolute) or prismatic joints, to form open or closed chains (or loops). Such kinematic chains, with at least one link fixed, become (1) mechanisms if at least two other links remain mobility, or (2) structures if no mobility remains. In other words, a mechanism permits relative motion between its "rigid links"; a structure does not. Since linkages make simple mechanisms and can be designed to perform complex tasks, such as nonlinear motion and force transmission, they will receive much attention in mechanism study.(机构或连杆构件是一个可约束的传动链而且是一个从输入到输出以传递运动和(或)力为目的的机械装置。

连杆机构是由通常被认为是刚体构件或杆组成的,它们是以销轴铰接的,例如用柱销(圆形的)或棱柱体销轴铰接,以便成形开式或闭式(回环式)的运动链。

这样的运动链在至少有一个构件被固定的条件下:(1)如果至少有两个构件能保持运动,就变为机构,(2)如果没有一个构件能够运动,则就成为结构。

换句话说,机构是允许其“刚性构件”之间相对运动,而结构则不能。

由于连杆机构做成一简单机构而且能设定实现复杂的任务,例如非线性运动和力的传递运动。

它们在机构学研究中将受到更多的关注。

)。

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