摘要汽车振动是影响汽车性能的重要因素，这种振动会影响汽车的整体平顺性、操纵稳定性、以及其安全性。在车辆的减振中，起主要作用的是汽车的悬架系统，而减振器是汽车悬架系统的重要组成部分，所以如何提升减振器的整体性能成为了研究中主要内容。而减振器的性能效果的提高依赖于其测试技术的发展，本课题中采用的是电液伺服式双动试验台，并应用LabVIEW软件对信号的发生和采集进行编程，通过测控系统产生试验信号，经过放大和调节，输出电流信号，使液压缸活塞按要求的方向和速度运动，并带动减振器运动，位移、速度、力和加速度通过各类传感器获取，作为实验所需的信号，经过一定的调理和分析，得到要求的减振器性能曲线。试验台采用计算机通过测控系统进行试验过程的自动控制、数据采集，并自动生成减振器的示功特性和速度特性曲线。基于虚拟仪器的测控系统能方便的进行数据的处理和在线存储和打印。49447

毕业论文关键词：减振器；双动试验台；测控系统；虚拟仪器；电液伺服

ABSTRACT An important factor which impact automobile performance is vibration, and vehicle riding and handling stability performance and the fatigue life of automotive components is impacted badly by this vibration. In automotive vibration reducing, suspension acts the main part, and as a part of suspension, damper plays domiciliary. So it is very important significance to study and improve damper performance, and it depends on the development of testing technique. This experiment is used in electrohydraulic servo type test stand. By programming to simulate the test signal and collect data in LabVIEW software. When the action signal is send out by computer, it is amplified and modulated. Output is electric current signal which make hydraulic autuator moving according to required direction and velocity, meanwhile the damper move according to the actuator movement. The displacement, velocity, force and acceleration is measured by the sensor respectively. The singles are input to AD converter, required damper characteristic spot is gained by processing these data. Computer and measure & control system is used in test bench to automatic control test processing, and acquire test data, and make force-displacement and force-velocity plot of damper. The data and plot is saved and printed conveniently.

Keywords: damper；double acting pneumatic test rig；measure&control system；Virtual instrument；Electro-hydraulic servo

目录

第一章  绪论 1

1.1 课题来源 1

1.2 国内外研究现状 2

1.3 本课题的研究内容 3

第二章 电液伺服试验台试验方法 4

2.1 汽车减震器的台架试验方法 4

2.2 汽车减震器的性能试验方法 4

2.2.1 示功特性试验方法 4

2.2.2 速度特性试验方法 5

2.2.3 温度特性试验方法 6

2.2.4 减震器抗泡沫性测试 7

2.3 减震器耐久特性试验 8

2.4 本章小结 10

第三章 控制系统硬件设计 11

3.1 试验台工作原理 11

3.2 液压系统元件的选择 11

3.2.1 液压源的选择 12