悬架系统振动特性的非平稳虚拟激励法研究  

Non-stationary Pseudo Excitation Method for Analyzing Vibration Characteristics of Suspension System

作　　者：张步云 戴涛 TAN Chin-An 李江 张勇 李韶华[4] ZHANG Buyun;DAI Tao;TAN Chin-An;LI Jiang;ZHANG Yong;LI Shaohua(Automotive Engineering Research Institute,Jiangsu University Zhenjiang,212013,Chhina;Department of Mechanical Engineering,Wayne State University Detroit,48202,USA;Nanjing Golden Dragon Bus Co.,Ltd.Nanjing,210000,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University Shijiazhuang,050043,China)

机构地区：[1]江苏大学汽车工程研究院,镇江212013 [2]韦恩州立大学机械工程学院,底特律48202 [3]南京金龙客车制造有限公司,南京210000 [4]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043

出　　处：《振动．测试与诊断》2022年第2期227-234,403,共9页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(51705205);江苏省政府留学奖学金资助项目(JS-2019-190);省部共建交通工程结构力学行为与系统安全国家重点实验室开放课题资助项目(KF2021-14)。

摘　　要：传统时频分析法在分析悬架系统非平稳随机振动时难以同时提高时频分辨率,无法精确分析其时频特性。针对非平稳虚拟激励法的关键问题,构造了一种新型非均匀调制函数,以提高悬架系统垂向振动特性的分析精度。利用该非均匀调制函数,建立车辆单轮非平稳虚拟激励通用模型;基于协方差等效法,解决前后轮变时差问题;建立1/2车辆动力学模型,求得车辆垂向加速度演变功率谱,获得高分辨率时频分布。仿真分析了匀速和变速两种行驶工况下悬架振动特性,并经过整车试验验证得到结论:车辆非平稳行驶时,速度的增加将扩大共振区范围。该特性可为提高车辆行驶平顺性提供理论参考。It′s hard to employ traditional time-frequency analysis methods to improve both time and frequency resolution when analyzing the non-stationary random vibration of suspension systems.Therefore,obtaining the vibrational characteristics,especially in time and frequency domain simultaneously has always been a key problem.This paper proposes a new non-uniform modulation function combined with the non-stationary pseudo excitation method to solve the previous problem.A general model of non-stationary pseudo excitation for a single wheel is established through the new non-uniform modulation function.Then,the difficulty in the time difference between the front and rear wheels is solved based on the covariance equivalence of stationary and non-stationary processes.Also,a half vehicle model is established,and the evolutionary power spectrum of the vertical acceleration is computed which shows a higher resolution distribution in time-frequency domains.Finally,two cases of vehicles traveling at constant and varying speeds are studied and the results show that when the vehicle travels at a varying speed,the increased speed will result in the expansion of the resonance range.Hence,this conclusion is of great value for improving vehicle ride comfort.

关 键 词：非平稳随机振动 虚拟激励法 非均匀调制函数 振动特性 时频分析 

分 类 号：O324[理学—一般力学与力学基础] U461.4[理学—力学]