曲轴轴系的动特性分析  

Analysis of Dynamic Characteristics of Crankshaft System

作　　者：刘永红[1] 任工昌[1] 王步康[1] 张优云[1] 

机构地区：[1]西安交通大学润滑理论及轴承研究所,陕西西安710049

出　　处：《内燃机学报》2003年第5期351-355,共5页Transactions of Csice

基　　金：国家自然科学基金资助项目(59990472);"863"计划资助项目(2001AA411310)。

摘　　要：以4缸内燃机为例,在建立三维装配实体的基础上,采用有限元法对曲轴轴系和机体进行了动特性分析。在建模中充分考虑了实际约束条件,并对关键部件的接触问题做了处理。计算采用系统级的动特性分析方法获得了曲轴轴系的扭转、弯曲、伸缩振动及其复合振动,显示出了曲轴轴系和机体各部件振动特性。结果表明该系统的模态密集,频率范围很宽,对于发动机工作过程中产生的宽带激励信号,比较容易引起曲轴轴系的振动。The 3D assembly model of a fourcylinder engine with the crankshaft system and block is established, actual restrictions and contact areas of key parts have been considered in model construct, and then the dynamic characteristics of system level have been carried out by FEM method. The calculation about the torsion, bend, flexibility and compound vibration shows vibration characteristics of the crankshaft system and block, and it indicates that the system has dense modes and broadly frequency response, giving rise to the vibration of the crankshaft system with the broad band input signal.

关 键 词：4缸内燃机 曲轴轴系 动特性分析 宽带激励信号 曲轴 

分 类 号：TK403[动力工程及工程热物理—动力机械及工程]