动力总成悬置系统国内研究情况基于动力总成质心位移及转角控制的悬置系统优化设计

导读作者简介作者：吕兆平本文首发于汽车NVH云讲堂（SGMW-NVH）公众号与技术邻平台，技术邻CAE学院授权转载。吕兆平，主任工程师，擅长动力学仿真，悬置系统....

作者简介

作者：吕兆平

本文首发于汽车NVH云讲堂（SGMW-NVH）公众号与技术邻平台，技术邻CAE学院授权转载。

吕兆平，主任工程师，擅长动力学仿真，悬置系统开发，汽车动力底盘NVH控制。

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【摘要】使用多目标遗传优化算法，在悬置刚度基本不变的情况下，以悬置安装角度为主要变量，并以各自由度方向的解耦率最大以及传递到车身侧的动反力最小为目标，对某车型发动机悬置系统进行优化设计。对优化结果制作样件并进行测试。测试结果表明，该方法可以有效控制动力总成在垂直方向的振动和绕曲轴的扭转振动，减少悬置支撑点动反力幅值，从而减少车身振动和降低车内噪声。

关键词:发动机悬置系统；解耦率；多目标优化；动力总成质心位移及转角控制

The Optimization Design of The EngineMount System Base on TheDisplacement and Angle control of The Powertrain COG

【Abstract】A vehicle engine mount system is optimized using themulti-objective genetic optimization algorithm, where the mount installation angleis chosen as main variables with essentially unchangedtheengine mount stiffness,and the maximization of decoupling rate of 6 DOFs and the minimization of thedynamic reaction force transmit to vehicle body is considered as the objectives.TheCalculation formula for determining the dynamic displacements of a powertraincenter ofgravity (c. g. ) and the dynamic reaction forces of each mount in a enginemount system was deduced and Matlab program was compiled.The road excitationand the torque stimulation around the direction of the crankshaft was appliedto the simulation model.The powertrain centroid displacement and Angle iscompared before and after optimization.Finally, some optimized samples weremade and tested. The test results demonstrate that the amplitudes of apowertrain c. g. in bounce mode and roll mode (around enginecrankshaft) andreaction forces in each mounts of a PMS are reduced greatly by using thismethod, thus reducevibrations ofthe car body and interior noise.

Keywords:Engine Mount System;DecouplingRate;The Multi-objective GeneticOptimization Algorithm ;The Displacement and Angle Control of The Powertrain COG

1 前言

目前动力总成系统振动控制方法很多：例如固有频率控制法，解耦率方法，悬置动反力最小法等。例如通过调节系统固有频率，使激励频率高于相应固有频率的 倍，并尽量使各个振动模态解耦