Vibration signal analysis of cylinder head during engine combustion process

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (13) : 210-215.

WANG Yang, CHENG Yong

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Abstract

Here, based on bench tests of single-cylinder diesel engine and simulation analysis of virtual prototype, main excitation sources and their coupling relationship of vibration acceleration signal on cylinder head surface were studied. The integrity and effectiveness of combustion excitation response signal extracted with the band-pass filtering technique and empirical mode decomposition (EMD) were discussed. The results showed that the main excitation sources of vibration acceleration signal of cylinder head surface are cylinder inner pressure and reciprocating inertia force; vibration responses of the two are overlapped in time domain and frequency one, and energy of the overlapped parts depends on working process in cylinder and engine speed; on combustion excitation response curve obtained using the band-pass filtering technique based on coherence analysis, position of feature points used to identify feature parameters of combustion process is affected by engine type and combustion state in cylinder; there is mode-mixing problem between combustion excitation response and non-combustion excitation one both obtained using EMD; the combustion excitation response signal obtained with EMD can be modified based on reciprocating inertia force excitation response signal description model to reduce the dispersion of feature points related to combustion process on combustion excitation response curve.

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internal combustion engine / vibration analysis / coherence / empirical mode decomposition (EMD)

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WANG Yang, CHENG Yong. Vibration signal analysis of cylinder head during engine combustion process[J]. Journal of Vibration and Shock, 2021, 40(13): 210-215

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