汽车行驶平顺性

输出 车身传至人体的加速 悬架弹簧动挠度 车轮与路面间的动载
6.1 Response to Vibration of Human and Evaluation of Ride Performance （人体对振动的反应以及平顺性的评价） 1. Response to Vibration of Human: Response to Vibration of Human is determined by frequency频率； intensity强度； acting direction作用方向； exposure time暴露时间。 ISO2631-1:1997(E).Mechanical vibration and shock——Evaluation of human exposure to wholebody vibration－Part1:General requirement《人体承 受全身振动评价——第一部分：一般要求》 GB/T4970-2009. Method of random input running test--Automotive ride comfort 《汽车平顺性随机输入 行驶试验方法》
Generalization
Evaluation Method of Ride Performance（平顺性的评价方法) ： 1.Accoding to comfort feeling of passenger:根据乘员舒适程度评价 2. Automobile vibration system and its evaluation index:汽车振动系统及 其评价指标
Input: Road Surface Roughness, Speed
Vibration System: elastic element, damp element, mass of body,wheel
Evaluation Index: weighted acceleration root mean square value, probability of bump suspension stop block, driving safety
m/ s
2
Equivalent time curve
acceleration root mean square value
tc
m / s2
vertical direction
fc
acceleration root mean square value
horizontal direction
tc
Chapter 6 Ride Performance 汽车的行驶平顺性
Generalization （概述） 6.1 Human Response to Vibration and Evaluation of Ride Performance （人体对振动的 反应以及平顺性的评价） 6.2 Statistic Property of Road Surface Roughness （路面不平度的统计特性） 6.3 Simplify of Automobile Vibration System and Vibration of Single Mass System（汽车振动系统 的简化及单质量系统的振动）
Meanings of Ride Performance (汽车行驶平顺性 含义): Automobile Vibration caused by Road Surface Roughness. Its frequency scope is about 0.5~25HZ.(路面不平度引起的汽 车振动，频率范围0.5~25HZ。)
Output: body acceleration, dynamic deflection of suspension spring, dynamic load between wheel and road surface
输入 路面不平度 车速
振动系统 弹性元件 阻尼元件 车身、车轮质量
评价指标 加权加速度均方根值 撞击悬架限位概率 行驶安全性
Exposure Limit 暴露极限：Human is in
health and safety while vibration intensity is within Exposure Limit.
Fatigue- Work Efficiency Decrease Limit疲劳－工效降低界限：Human can be
fc
vertical direction
horizontal direction
Most sensitive frequency scope of human 人体最敏感的频率范围 • Vertical direction：4~12.5HZ 4~8HZ: sympathetic vibration of bowels 人体内脏器官产生共振 8~12.5HZ: affect chine system 影响人的脊椎系统 • Horizontal direction：0.5~2HZ horizontal vibration is the bigger influence factor while frequency scope within 3HZ.
sensitive to drive while vibration intensity is within this liBiblioteka Baiduit.
Comfort Decrease Limit舒适降低界限：
Human can eat，read and write easily while vibration intensity is within this limit.
暴露极限：当人体承受的振动强度在此界 限内，将保持人的健康或安全。它作为人 体可承受振动量的上限。 疲劳－工效降低界限：当人承受的振动强 度在此界限内时，能准确灵敏地反应，正 常地进行驾驶。它与保持人的工作效能有 关。 舒适降低界限：在此界限之内，人体对所 暴露的振动环境主观感觉良好，能顺利地 完成吃、读、写等动作。它与保持人的舒 适有关。