标题：Modified RMS Calculation Formulae for Vehicle Vibration Responses and Their Engineering Application [改进的车辆振动响应均方根值计算公式及其工程应用]
作者：Yu, Yuewei ;Zhao, Leilei ;Zhou, Changcheng
作者机构：[Yu, Yuewei ;Zhao, Leilei ;Zhou, Changcheng ] School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo; 255000, China
来源：Qiche Gongcheng/Automotive Engineering
关键词：Calculation formulae; Filtered white noise; Overe-stimation; Root mean square value; Vehicle vibration responses
摘要：In order to effectively solve the problem of over-estimation of the existing formulae for calculating the root mean square (RMS) of vehicle vibration responses in practical engineering applications, the filtered white noise road spectrum is used as the road input model of vehicle system, and by using the random vibration theory and the integral solving method of complex variable function and based on quarter vehicle model, the RMS calculation formulae for the car body vertical vibration acceleration, the suspension dynamic deflection, and the wheel dynamic load are derived and verified by real vehicle test. The comparative analysis with the calculation results of traditional white-noise road spectrum input model indicates that the calculation formulae derived can more truly reflect the actual vibration of vehicle, while the traditional calculation model overestimates the vehicle vibration responses under high-speed operation. The formulae can be effectively applied to the estimation of vehicle driving vibration responses, the prediction of road grade, and the estimation of suspension damping ratio in vehicle initial design. © 2019, Society of Automotive Engineers of China. All right reserved.