内燃机设计时,正确预示其运动件的动力特性,对控制噪声,振动和减轻内燃机的重量是十分重要的。内燃机的运动件通常由几个活塞、几根连杆,一根曲轴和一个飞轮组成。由于结构如此的复杂,直接用普通方法,如有限元素法(FEM)和传递矩阵法(TMM),是不能对其进行振动分析的。本文中用作者提出的转换阻抗法(RIM)就能分析它们的自振频率,振型和动力响应。 Internal combustion engine design, the correct prediction of the dynamic characteristics of the moving parts, to control noise, vibration and reduce the weight of the internal combustion engine is very important. The moving parts of the internal combustion engine usually consist of several pistons, several connecting rods, a crankshaft and a flywheel. Due to the complexity of the structure, it is not possible to perform vibration analysis directly using ordinary methods such as finite element method (FEM) and transfer matrix method (TMM). In this paper, the authors propose the conversion impedance method (RIM) can analyze their natural frequency, mode and dynamic response.