基于有限元法的动力总成悬置系统解耦方法研究

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。

Decoupling Analysis of Powertrain Mount Systems based on Finite Element Method

The 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 rear vehicle state. For this reason, a new method of decoupling the powertrain mounting system based on the finite element method is proposed. In the first example, the finite element model of the powertrain suspension system is decoupled and compared with the decoupling rate obtained by decoupling the traditional 6-DOF rigid-suspension mathematical model. The results show that the results of the modal decoupling matrix output by the two methods are basically the same, which proves the correctness and effectiveness of the new method. Based on the finite element model of the vehicle, the second example is decoupled with the finite element method to obtain the real decoupling ratio associated with the 13 degrees of freedom of the vehicle, and the profitability of the new method is verified.