汽车平顺性分析中时域法和频域法的对比  

Comparison Between Time and Frequency Domain Method in Vehicle Ride Comfort Analysis

作　　者：徐中明[1,2] 周小林[2] 余烽[2] 张芳[2] 谭建林 

机构地区：[1]重庆大学,机械传动国家重点实验室,重庆400030 [2]重庆大学机械工程学院,重庆400030 [3]湖南南车时代电动汽车股份有限公司技术中心,株洲400054

出　　处：《汽车工程》2012年第4期306-310,共5页Automotive Engineering

基　　金：国家自然科学基金项目(50975296);教育部博士点基金(20100191110004)资助

摘　　要：依据国际标准ISO2631和国标GB/T4970《汽车平顺性随机输入行驶试验方法》,对某客车进行了行驶平顺性试验,重点研究了不同算法在平顺性分析中的差别。以FAMOS、VC&MATLAB为软件开发平台,在Parse-val定理基础上实现了时、频域两种算法。结果表明,各种算法计算结果差别不大但各有特点,时域法对峰值系数更加敏感,可用于从人体舒适性角度评价平顺性;频域法则适用于分析1/3倍频程各频带对人体振动的影响并为改善汽车平顺性提供依据,但存在精度较低、处理效率不高等问题。而频率法中两种谱估计法的对比结果表明,Welch经典谱估计法的一致性较差,而采用AR模型的Yule Walker估计法性能相对稳定。Based on international standard ISO2631 and national standard GB/T4970 Method of random input running test-Automotive ride comfort,the ride comfort tests are conducted on a bus with a study focused on the applicability discrepancy between different algorithms in ride comfort analysis.By applying Parseval theorem,both time and frequency domain algorithms are implemented with FAMOS and VCMATLAB software development platforms.The results show that the outcomes of calculation with different algorithms don＇t have significant differences,but each algorithm has its own distinguishing feature.The time domain algorithm is more sensitive to peak factor and can be used to evaluate the ride comfort of vehicle from the perspective of human body comfort,while the frequency domain algorithm is suitable for analyzing the influence of each frequency of one-third octave band on human body vibration and providing bases for ride comfort improvement,but with the defects in lower accuracy and processing efficiency.And in frequency domain,the results of comparison between two spectrum estimation schemes indicate that the Welch classic spectrum estimation technique has poor consistency while the Yule-Walker method using AR model has relatively stable performance.

关 键 词：汽车 平顺性 时域法 频域法 功率谱估计 

分 类 号：U461.4[机械工程—车辆工程]