客车车身结构的随机应力分析

本文以BJ-633A型旅行车车身为研究对象,在海南试车场及一般公路上进行了动态测试,将获取的随机信号在CF-500频谱分析仪、SW-160和SD-142应力波分析仪上进行了数据处理,着重分析了该车以不同车速在各种道路上行驶时,车身结构动应力的随机特性以及对车身结构强度的影响。指出路面不平度和车速是强化车身结构可靠性试验的重要因素。

Stochastic Stress Analysis of Automobile Bodv Structure

This article emphasizes the analysis of the stochastic character of dynamic stresses on the BJ-663 van's body structure in different speeds and on different paths during testing. The test was carried out at Hai Nan Experimental Ground and ordinary highways. CF-500 Frequency spectrum analyzer, SW-160 and SD-142 stress wave analyzer were used for data processing. It is concluded as follow: The speed as well as the roughness of highway was of the important function in the intensive reliability test and the stress responses of the element of the body structure presented a low frequency narrow band so that during the body analysis,the low exponents in main mode can be calculated and high exponents neglected. When the van was driven on different paths, sensibilities of stress response on each measuring point of the elements of the body according to positions were quite different so that the strength test of the body must be taken on different paths for overall exam etc.