基于有限元与多体动力学仿真的发动机失火故障特征提取研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (9) : 18-23.

论文

基于有限元与多体动力学仿真的发动机失火故障特征提取研究

杜灿谊1，2 , 丁康1, 杨志坚1

作者信息 +

Feature Extraction of Engine Misfire Fault Based on Finite Element and Multi-body Dynamics Simulation

DU Can-yi1,2 ，DING Kang1，YANG Zhi-jian1

Author information +

文章历史 +

摘要

提出基于多体动力学和有限元计算的故障仿真方法，通过分析比较振动信号变化来提取故障特征。利用AVL EXCITE平台，建立一个高质量带悬置的四缸发动机动力总成有限元多体动力学仿真模型，以发动机失火故障为例，设置相关参数模拟失火状态运行，求解发动机稳态转速和加速工况的缸体和缸盖位置振动加速度响应信号，经频谱、阶次和小波等分析，对比正常状态和故障状态的差异，提取故障特征。通过实车失火故障试验进行对比，发现仿真结果与试验结果有较好的一致性。利用多体动力学有限元模型进行故障仿真分析的结果，可用于指导实际发动机故障诊断。

Abstract

Fault simulation method based on multi-body dynamics and finite element calculation is proposed, and fault features can be extracted by the analysis and comparison of vibration signals. In AVL EXCITE platform, a high quality finite element and multi-body dynamics model of four-cylinder engine with mounts is designed. Misfire fault is taken as example, vibration signals of engine block or head could be gained under steady and acceleration operating conditions through setting related parameter for simulation. By spectrum, order, and wavelet analysis, differences between normal and fault state are extracted as fault features. The result of experiment show that simulation result is consistent with experimental result, therefore, fault simulation and feature extraction by using the multi-body dynamics and finite element model can guide the engine fault diagnosis.

导出引用

杜灿谊;;丁康; 杨志坚 . 基于有限元与多体动力学仿真的发动机失火故障特征提取研究[J]. 振动与冲击, 2012, 31(9): 18-23

DU Can-yi;;DING Kang;YANG Zhi-jian . Feature Extraction of Engine Misfire Fault Based on Finite Element and Multi-body Dynamics Simulation[J]. Journal of Vibration and Shock, 2012, 31(9): 18-23