基于等效分析模型的发动机悬置系统优化设计

THE OPTIMIZATION OF ENGINE MOUNTING SYSTEM BASED ON AN EQUIVALENT MODEL

利用ANSYS有限元分析软件建立发动机悬置系统等效分析模型,将发动机动力总成悬置系统等效为一个惯性体和一个弹性体的复合体,各悬置元件简化为沿其3个弹性主轴方向的弹簧,并可准确体现动力总成的质量,转动惯量和激励力加载位置。利用ANSYS完成该模型的模态分析,并进行了能量解耦度和谐振频率的优化计算,结果表明,该等效建模方法是正确和可行的。该模型为在ANSYS中进行悬置系统模态分析优化和动力响应分析与隔振率优化提供了新的切实可行的简捷建模方式。

An equivalent analysis model for an engine mounting system is built with the ANSYS software. The engine powertrain is idealized to an equivalent composite body composed of one inertial body and one elastic body. Every mounting component is simplified as one spring along its three principal elastic axes and the powertrain mass, and rotational inertia and exciting-force loading locatiosn are accurately embodied. The modal analysis, optimization of energy decoupling degree and resonant frequency of an equivalent model were carried out in ANSYS. Results show that the equivalent modeling method is valid and feasible. For an engine mounting system, this model provides a new simplified modeling method for the modal analysis and optimization of dynamic response and vibration isolation rate in ANSYS.