发动机机体结构振动模态分析

Structural Vibration Modal Analysis of Engine Blocks

目的 建立某发动机的有限元模型 ,并进行模态分析 ,为研究机体的优化和动力匹配作准备工作 .方法 用 Ansys5.4有限元分析软件 ,对一 1 2缸 V型发动机进行自由模态分析 ,其中采用 1 0节点 4面体单元构造出较详细的机体离散模型 .结果 求解了机体的自由模态参数 ,与试验模态分析所得到的模态参数相对照 .结论 表明有限元方法对复杂结构的动力分析是一种有效方法 ,为进一步研究机体的优化。

Aim\ To build a finite element model and analyze the normal model of an engine for the study of the engine optimization and dynamic matching. Methods\ Analyze the normal modal of a V type engine with 12 cylinders by using Ansys5.4 finite element software.In addition, builded a detailed disperse model of engine blocks by 10 node points tetrahedron unit. Results\ The calculated modal parameters of the block using the finite element method is compared to the experimental values coming from the modal test method to ensure the validity of the finite element model. Conclusion\ The finite element model valid enough to dynamic analysis of complex structure, and settled bases for the engine optimization dynamic matching and dynamic response.