南京航空航天大学学报（英文版）2021，Vol.38Issue(2)：333-343,11.
基于时频谱的变速行驶车辆悬架系统动态共振频域特性研究
Dynamic Resonant Frequency Bands of Suspension System of Vehicles with Varying Speeds Based on Time-Frequency Spectrum
摘要
Abstract
The dynamic responses of suspension system of a vehicle travelling at varying speeds are generally non-stationary random processes,and the non-stationary random analysis has become an important and complex problem in vehicle ride dynamics in the past few years. This paper proposes a new concept,called dynamic frequency domain (DFD),based on the fact that the human body holds different sensitivities to vibrations at different frequencies,and applies this concept to the dynamic assessment on non-stationary vehicles. The study mainly includes two parts,the first is the input numerical calculation of the front and the rear wheels,and the second is the dynamical response analysis of suspension system subjected to non-stationary random excitations. Precise time integration method is used to obtain the vertical acceleration of suspension barycenter and the pitching angular acceleration,both root mean square(RMS)values of which are illustrated in different accelerating cases. The results show that RMS values of non-stationary random excitations are functions of time and increase as the speed increases at the same time. The DFD of vertical acceleration is finally analyzed using time-frequency analysis technique,and the conclusion is obviously that the DFD has a trend to the low frequency region,which would be significant reference for active suspension design under complex driving conditions.关键词
非平稳随机过程/悬架系统/车辆建模/动态频域/平顺性Key words
non-stationary random process/suspension system/vehicle modeling/dynamical frequency domain (DFD)/ride comfort分类
数理科学引用本文复制引用
张步云,曾发林,TAN Chin-An..基于时频谱的变速行驶车辆悬架系统动态共振频域特性研究[J].南京航空航天大学学报（英文版）,2021,38(2):333-343,11.基金项目
This work was supported by the Na-tional Natural Science Foundation of China(No.51705205). （No.51705205）
