基于解耦及广义力传递率的轻卡动力总成悬置刚度参数优化 Optimal Design of Powertrain Mounting Stiffness Parameters of Light Trucks for Decoupling Ratio and Generalized Force Transmissibility

Abstract

本文以某国产轻卡为研究对象，建立了其动力总成悬置系统六自由度振动力学模型。利用Matlab计算出其固有频率、主振型、能量分布矩阵和广义力传递率。以悬置系统的解耦及广义力传递率为优化目标，并对系统的固有频率范围及刚度参数上下限加以约束，用遗传算法对悬置刚度、安装位置同时进行了优化设计，使悬置系统在怠速工况下的隔振效果大大提高。 In this paper a six-degree freedom vibration mechanical model of the powertrain mounting system of a light truck made in China is set up. The natural frequency, principal mode, energy distribution matrix and generalized force transmissibility are counted by Matlab. We take decoupling and generalized force transmissibility of powertrain mounting systems as the optimization goals, restrict the natural frequency range and the limit of stiffness parameters, and have optimized the design of mounting stiffness parameters and mounting positions through genetic algorithm. As a result, the isolation effect of the powertrain mounting system at idle speed is greatly improved.