质量质心及转动惯量一体化测试系统设计
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II来自哈尔滨工业大学硕士学位论文
Keywords: Center of mass; Moment of inertia; Gas bearing; Multipoint weighing method; Torsional pendulum method
III
哈尔滨工业大学硕士学位论文
目录
摘要 ........................................................................................................................... I Abstract ..................................................................................................................... II 目录 ........................................................................................................................ IV 第 1 章 绪论 ............................................................................................................ 1
1.2.1 多点称重法 .................................................................................... 1 1.2.2 非平衡力矩法 ................................................................................ 2 1.3 转动惯量测量的国内外研究现状 ........................................................... 3 1.3.1 扭摆法 ............................................................................................ 3 1.3.2 落体法 ............................................................................................ 4 1.3.3 三线摆法 ........................................................................................ 5 1.3.4 复摆法 ............................................................................................ 5 1.4 课题主要研究内容 ................................................................................... 6 第 2 章 系统总体设计 ............................................................................................ 7 2.1 引言 ........................................................................................................... 7 2.2 系统总体组成 ............................................................................................ 7 2.3 硬件部分 ................................................................................................... 9 2.4 软件部分 ................................................................................................. 10 2.5 测量原理分析 ......................................................................................... 12 2.5.1 质心测量原理分析 ...................................................................... 12 2.5.2 转动惯量测量原理分析 .............................................................. 14 2.6 测量流程设计 ......................................................................................... 15 2.6.1 平台工作位置设计 ...................................................................... 15 2.6.2 质量质心测量流程 ....................................................................... 17 3.4.3 转动惯量测量流程 ...................................................................... 19 2.7 本章小结 ................................................................................................. 21 第 3 章 气浮轴承设计 .......................................................................................... 23 3.1 引言 ......................................................................................................... 23 3.2 气浮轴承基本计算方法 ......................................................................... 23
1.1 课题背景及研究意义 ............................................................................... 1 1.2 质量、质心测量的国内外研究现状 ....................................................... 1
哈尔滨工业大学硕士学位论文
Abstract
The center of mass and moment of inertia directly affect the accuracy of the spacecraft orbit and attitude control, however modern aircraft performance is so advanced, structure is extremely complex, theoretical calculation is difficult to accurately get its center of mass and moment of inertia. The main method to get center of mass and moment of inertia is based on experimental method, which uses the instruments to the center of mass and moment of inertia of the actual measurement. The vast majority of cases, the center of mass and moment of inertia measurement is time-sharing with different equipments, this will greatly increase the workload, and is likely to introduce additional measurement error. Aiming at this situation, this paper puts forward a new type of thrust gas bearing and cylinder bearing the integration of center of mass and moment of inertia measurement system to solve this problem.
Gas bearing is the key component of this measurement system, so its structure and parameter design is crucial. In this paper, using the membrane gas bearing capacity and stiffness as a design standard, carry on the design. Unlike regular gas bearing, the gas bearing adopts integrated design of this system, namely thrust bearing and cylinder bearing close 2 in 1, it won’t be able to adopt the method of conventional rough estimates on its bearing capacity. Solution is to use the finite element method, the gas film block, and then using the river basin, the 2 d flow into a one-dimensional flow, get the pressure distribution formula of the bearing is acquired using numerical solution of the carrying capacity of the gas film stiffness.
First, this article embarks from the system overall scheme, design of the system of basic hardware and software. Hardware mainly includes the mechanical structure of the test bed sections corresponding to the function, software composition is mainly discussed the realization of the software technology and basic functions. System on the basis of overall scheme, analysis the basic measuring principle, design of test bed four basic points, and measurement process based on the basic location of the system.
In addition to the gas bearing, this article also other structure design and analysis of the system, mainly including general structure analysis and supports the design and analysis of bedplate, roll ring tooling design analysis, lift - support system design analysis, horizontal torsional pendulum system design, vertical torsional pendulum system design analysis and the analysis of the standard sample design.
The system error was analyzed mainly including quality measurement error, the center of mass measurement error and moment of inertia measurement error.
Keywords: Center of mass; Moment of inertia; Gas bearing; Multipoint weighing method; Torsional pendulum method
III
哈尔滨工业大学硕士学位论文
目录
摘要 ........................................................................................................................... I Abstract ..................................................................................................................... II 目录 ........................................................................................................................ IV 第 1 章 绪论 ............................................................................................................ 1
1.2.1 多点称重法 .................................................................................... 1 1.2.2 非平衡力矩法 ................................................................................ 2 1.3 转动惯量测量的国内外研究现状 ........................................................... 3 1.3.1 扭摆法 ............................................................................................ 3 1.3.2 落体法 ............................................................................................ 4 1.3.3 三线摆法 ........................................................................................ 5 1.3.4 复摆法 ............................................................................................ 5 1.4 课题主要研究内容 ................................................................................... 6 第 2 章 系统总体设计 ............................................................................................ 7 2.1 引言 ........................................................................................................... 7 2.2 系统总体组成 ............................................................................................ 7 2.3 硬件部分 ................................................................................................... 9 2.4 软件部分 ................................................................................................. 10 2.5 测量原理分析 ......................................................................................... 12 2.5.1 质心测量原理分析 ...................................................................... 12 2.5.2 转动惯量测量原理分析 .............................................................. 14 2.6 测量流程设计 ......................................................................................... 15 2.6.1 平台工作位置设计 ...................................................................... 15 2.6.2 质量质心测量流程 ....................................................................... 17 3.4.3 转动惯量测量流程 ...................................................................... 19 2.7 本章小结 ................................................................................................. 21 第 3 章 气浮轴承设计 .......................................................................................... 23 3.1 引言 ......................................................................................................... 23 3.2 气浮轴承基本计算方法 ......................................................................... 23
1.1 课题背景及研究意义 ............................................................................... 1 1.2 质量、质心测量的国内外研究现状 ....................................................... 1
哈尔滨工业大学硕士学位论文
Abstract
The center of mass and moment of inertia directly affect the accuracy of the spacecraft orbit and attitude control, however modern aircraft performance is so advanced, structure is extremely complex, theoretical calculation is difficult to accurately get its center of mass and moment of inertia. The main method to get center of mass and moment of inertia is based on experimental method, which uses the instruments to the center of mass and moment of inertia of the actual measurement. The vast majority of cases, the center of mass and moment of inertia measurement is time-sharing with different equipments, this will greatly increase the workload, and is likely to introduce additional measurement error. Aiming at this situation, this paper puts forward a new type of thrust gas bearing and cylinder bearing the integration of center of mass and moment of inertia measurement system to solve this problem.
Gas bearing is the key component of this measurement system, so its structure and parameter design is crucial. In this paper, using the membrane gas bearing capacity and stiffness as a design standard, carry on the design. Unlike regular gas bearing, the gas bearing adopts integrated design of this system, namely thrust bearing and cylinder bearing close 2 in 1, it won’t be able to adopt the method of conventional rough estimates on its bearing capacity. Solution is to use the finite element method, the gas film block, and then using the river basin, the 2 d flow into a one-dimensional flow, get the pressure distribution formula of the bearing is acquired using numerical solution of the carrying capacity of the gas film stiffness.
First, this article embarks from the system overall scheme, design of the system of basic hardware and software. Hardware mainly includes the mechanical structure of the test bed sections corresponding to the function, software composition is mainly discussed the realization of the software technology and basic functions. System on the basis of overall scheme, analysis the basic measuring principle, design of test bed four basic points, and measurement process based on the basic location of the system.
In addition to the gas bearing, this article also other structure design and analysis of the system, mainly including general structure analysis and supports the design and analysis of bedplate, roll ring tooling design analysis, lift - support system design analysis, horizontal torsional pendulum system design, vertical torsional pendulum system design analysis and the analysis of the standard sample design.
The system error was analyzed mainly including quality measurement error, the center of mass measurement error and moment of inertia measurement error.