整车载荷相关性分析方法与道路模拟试验优化应用

Vehicle Load Correlation Analysis Method and Optimization Application of Road Simulation Test

整车多通道道路模拟试验是快速验证服役条件下车辆结构强度的重要试验方法,如何准确、高效地模拟车辆复杂结构多通道随机载荷谱是试验的关键难题。提出了基于载荷相关性分析的整车多通道载荷谱模拟的通道优选与调控方法。以试验车辆试验场实测载荷谱数据为基础,基于载荷谱频域相干系数分析方法,研究了在试验场特定道路工况条件下轮心六分力载荷谱与整车结构关键部位应变谱的相关性,总结了试验场特征道路工况下的轮心六分力损伤主导载荷谱,确定了迭代试验中多通道载荷模拟的优先级,实现了载荷模拟工作的降维。最后依据以上方法建立了整车多通道道路模拟试验,达到了较好的载荷模拟效果。论文研究成果可为整车及关键零部件多通道道路模拟试验的高效执行提供一定的借鉴。

Vehicle multi-channel road-load-simulation test is a key method for fast validating vehicle structure strength under service condition.How to accurately and effectively simulate multi-channel random load spectra of the complicated vehicle structures is a crucial problem.In this paper,a load correlation analysis based optimized and control method for vehicle multi-channel load spectra simulation was proposed.Based on the proving ground recorded load spectra of test vehicle,a load spectra frequency-domain coherence analysis method was applied to study the correlation between the wheel hub six-component force loads spectra and the critical structure strain spectra under the proving ground specific road condition.The damage dominant loads spectra of wheel hub six-component forces under the proving ground specific road condition were identified.Therefore,the priority loads channels simulation of iteration test was determined,and dimensionality reduction of loads simulation work was realized.Finally,the vehicle multi-channel road-load-simulation test was conducted according to the present method,and well loads simulation effect was acquired.The research can provide reference for effectively implementation of other vehicle and components multi-channel road-load-simulation test.