某重卡排气系统模态分析与悬挂点位置的确定方法

Modal Analysis of a Heavy Truck Exhaust System and the Method of Determining the Suspension Point

为了使某重卡排气系统传递给车架的振动能量最低,提高排气系统使用寿命,文章通过建立该排气系统的有限元模型,在发动机激励频率范围内对其进行自由模态分析,得到了排气系统各阶固有频率与振型,之后在此基础上使用平均驱动自由度位移法(ADDOFD)得到了悬挂点的最优位置,为排气系统的设计优化提供了理论基础。

In order to minimize the vibration energy transmitted by a heavy truck exhaust system to the frame and improve the service life of the exhaust system,this paper establishes a finite element model of the exhaust system to perform free modal analysis in the engine excitation frequency range.The natural frequencies and modes of each order of the exhaust system are used,and then the average driving freedom displacement method(ADDOFD)is used to obtain the optimal position of the suspension point,which provides a theoretical basis for the design optimization of the exhaust system.