Valve clearance fault detection based on wavelet packet analysis

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (12) : 64-68.

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Valve clearance fault detection based on wavelet packet analysis

Si Jing-ping1; Ren Qing-shuang1; Liang Hong-bo2; Zhang Bao-wei1

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Abstract

Taking the DA462 engine as the object, this research adjusted the valve clearance artificially to different values to simulate the fault of abnormal engine valve clearance, and obtained cylinder head vibration signals in normal and abnormal states separately, in order to do analysis in time domain. Also, this research decomposes the combustion excitation signals and the exhaust valve shut excitation signals through wavelet packet. The frequency bands of the excitation signals were determined by calculating the Root Mean Square (RMS) values of vibrational energy of reconstruction frequency bands. In order to achieve satisfying results, this research determine whether the valve clearance is normal or not, by comparing the RMS values.

Key words

valve clearance / wavelet packet / fault diagnosis / signal process

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Si Jing-ping;Ren Qing-shuang;Liang Hong-bo;Zhang Bao-wei. Valve clearance fault detection based on wavelet packet analysis[J]. Journal of Vibration and Shock, 2011, 30(12): 64-68