基于有限元法的动力总成悬置系统解耦方法研究  

Decoupling Analysis of Powertrain Mount Systems based on Finite Element Method

作　　者：孙秋 雷刚[1] 吕鑫阳 马洋洋 SUN Qiu;LEI Gang;LV Xinyang;MA Yangyang(The Key Laboratory of Manufacture and Test Techniques for Automobile Parts,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆理工大学汽车零部件制造及检测技术教育部重点实验室

出　　处：《噪声与振动控制》2019年第3期78-82,186,共6页Noise and Vibration Control

摘　　要：传统的动力总成悬置系统解耦方法通常是基于6自由度刚体-悬置数学模型得到与6自由度相关的解耦率。这种方法忽略动力总成悬置系统与车身、轮胎等子系统的耦合作用,难以反映实车状态下的解耦情况。为此,采用一种基于有限元法对动力总成悬置系统进行解耦的新方法。算例一用此方法对动力总成悬置系统有限元模型进行解耦,并与传统6自由度刚体-悬置数学模型解耦得到的解耦率进行对比,结果表明两种方法输出的模态解耦率矩阵结果基本一致,证明新方法的正确性与可行性。算例二基于整车有限元模型,用有限元法进行解耦,得到与整车13自由度相关的真实解耦率,证明新方法的收益性。Traditional powertrain mounting system decoupling method is usually based on the 6-DOF rigid-suspension mathematical model to obtain the decoupling rate associated with 6 degrees of freedom.This method ignores the coupling effect between the powertrain suspension system and the subsystems such as the BIW and the tire,and it is difficult to reflect the decoupling situation in the real vehicle state.For this reason,a new method of decoupling the powertrain mounting system is proposed based on finite element method.In the first example,the finite element model of the powertrain suspension system is decoupled and its decoupling rate is compared with that obtained by decoupling the traditional 6-DOF rigid-suspension mathematical model.The results show that the modal decoupling matrixes of the two methods are basically the same,which proves the correctness and effectiveness of the new method.In the second example,the whole vehicle model is decoupled with the finite element method to obtain the real decoupling rate associated with the 13-DOF vehicle.The profitability of the new method is verified.

关 键 词：振动与波 振动解耦 有限元分析 悬置系统 

分 类 号：U260.331.5[机械工程—车辆工程]