动力总成悬置系统固有频率、解耦率和动力响应优化分析  

Optimization Analysis of Natural Frequency, Decoupling Rate and Dynamic Response of Powertrain Mount System

作　　者：李雅喆 郑钰馨 LI Yazhe;ZHENG Yuxin

机构地区：[1]上汽大众汽车有限公司,上海201805

出　　处：《上海汽车》2022年第3期43-49,共7页Shanghai Auto

摘　　要：通过建立简化的动力总成悬置系统物理模型和动力学模型,得到了系统隔振性能频率范围要求以及系统固有频率和解耦率的计算方法,发现某三点式动力总成悬置系统的固有频率和解耦率都不符合车辆的减振性能要求,通过采用Fgoalattain算法对系统进行了优化,优化后的系统固有频率处于系统隔振要求的19 Hz以下,6个自由度上的解耦率都大于90%,通过系统优化前后时域曲线和频域曲线对比分析,发现优化后系统各方向上的振动幅值明显降低,系统隔振效果明显提高。By establishing a simplified physical model and a dynamic model of powertrain mount system,the frequency range requirement of system vibration isolation performance and the calculation method of system natural frequency and decoupling rate are obtained. It is found that the natural frequency and decoupling rate of a three-point powertrain mount system do not meet the requirements of vehicle vibration damping performance. By using Fgoalattain algorithm,the natural frequencies of the optimized system are all below the requirement of system vibration isolation 19 Hz,and the decoupling rate in six degrees of freedom are all greater than 90%. Through a comparative analysis of time-domain curve and frequency-domain curve before and after system optimization,it is found that the vibration amplitude in all directions of the optimized system are significantly reduced,so the vibration isolation effect of the system is significantly improved.

关 键 词：固有频率 解耦率 动力响应 Fgoalattain算法 优化 动力总成悬置系统 

分 类 号：U464.13[机械工程—车辆工程]