基于EEMD及敏感IMF的再制造发动机振动模式研究  

Vibration mode of remanufactured engine based on EEMD and sensitive IMF

作　　者：陈成法[1,2] 李树珉[2] 张建生[2] 张英锋[2] 孙长库[1] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072 [2]军事交通学院,天津300161

出　　处：《振动与冲击》2014年第2期117-121,共5页Journal of Vibration and Shock

基　　金：总装"十一五"预研项目(40402020102)

摘　　要：为更好提取再制造发动机的振动特征,采用总体平均经验分解模式(Ensemble Empirical Mode Decomposition,EEMD)对信号进行分解,并用于再制造发动机振动模式研究中。在对振动信号分解基础上,利用相关系数计算IMF分量与其原始信号间相关性及原始信号IMF分量敏感因子;利用敏感IMF进行Hilbert变换。研究结果表明,采用EEMD分解算法所得IMF分量能反映再制造发动机的振动特征,基于敏感IMF的边际谱能区分再制造发动机不同部件的振动模式,并将再制造发动机部件分为缸壁、缸盖、曲轴三种振动模式,对提高发动机再制造水平具有重要意义。In order to extract the vibration feature of remanufactured engine, the vibration signal was decomposed by ensemble empirical mode decomposition （EEMD） , and the method was also applied to study the vibration mode of remanufaetured engine. Based on the decomposition of vibration signal, correlation coefficient was introduced to study the correlation between IMF （intrinsic mode function） components and original signal. Sensitive factors of IMF components were calculated using the correlation coefficients. Hilbert transform was made on sensitive IMF components. The study results show that vibration features of remanufactured engine are hidden in IMF components decomposed by EEMD, the vibration modes of remanufactured engine can be differentiated by Hilbert-Huang spectrum and marginal spectrum based on sensitive IMF components. According to vibration features, the the vibration modes of cylinder wall, cylinder cover or crankshaft level of engine. vibration state of remanufactured engine is divided into , which are important to improve the remanufacturing level of engine.

关 键 词：EEMD分解 敏感IMF 振动模式 再制造发动机 

分 类 号：TK426[动力工程及工程热物理—动力机械及工程]