STUDY ON QUANTITATIVE DIAGNOSIS METHOD OF VALVE CLEARANCE BASED ON CYLINDER HEAD VIBRATION SIGNAL OF DIESEL ENGINE
Zhangming Peng1, 2, 3, Guojin Chen1, 2, Shaohui Su1, 2
1Hangzhou Dianzi University, Hangzhou, China
2Zhejiang Provincial Key Laboratory of Ship and Port Machinery Equipment Technology, Hangzhou, China
3Yangfan Group CO., LTD, Yangfan Ship Design & Research Institute, Zhoushan, China
The vibration signal of cylinder head contains abundant performance information of diesel engine, and it is inseparable from injection advance angle and valve timing in time domain, so it is easy to separate the response signal of each exciting force from vibration signal. In this paper, the vibration signals of the exhaust valve closing were cut out by extract time interval sampling, and the energy information of feature frequency range was extracted by HHT transform, the corresponding relationship between valve clearance and energy information was established after normalization, so that it is realized to quantitatively diagnose the valve clearance.