摘要
A hybrid of ensemble empirical mode decomposition and empirical mode decomposition (EEMD-EMD) is introduced to diagnose the valve-slap vibration signal,which is relative to the dominant combustion knock vibration signal given out by a diesel engine around the top dead center (TDC).The time-frequency representations of intrinsic mode functions (IMFs) decomposed by EEMD-EMD are obtained by adaptive generalized S transform (AGST).A type 493 diesel engine was used for the experiment,and the result indicates that the valve-slap of the diesel engine is serious,and the vibration frequencies are higher than the combustion knock.With EEMD-EMD-AGST approach,the valve-slap can be identified by the vibration analysis of the diesel engine.
A hybrid of ensemble empirical mode decomposition and empirical mode decomposition （EEMD-EMD） is introduced to diagnose the valve-slap vibration signal, which is relative to the dominant combustion knock vibration signal given out by a diesel engine around the top dead center （TDC）. The time-frequency representations of intrinsic mode functions （IMFs） decomposed by EEMD-EMD are obtained by adaptive generalized S transform （AGST）. A type 493 diesel engine was used for the experiment, and the result indicates that the valve-slap of the diesel engine is serious, and the vibration frequencies are higher than the combustion knock. With EEMD-EMD-AGST approach, the valve-slap can be identified by the vibration analysis of the diesel engine.
作者
ZHENG Xu
HAO Zhiyong
郑旭;郝志勇(Department of Energy Engineering,Zhejiang University,Hangzhou 310027,China)
基金
Supported by National Key Technology Research and Development Program of China (No.2011BAE22B05)
