Abnormal vibration diagnosis of diesel engine transmission mechanism based on PAVME

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (1) : 143-150.

FAULT DIAGNOSIS ANALYSIS

Abnormal vibration diagnosis of diesel engine transmission mechanism based on PAVME

ZHOU Qidi*, ZHANG Zhongwei, WANG Genquan, WANG Yanrong, ZHANG Limin, XU Chunguang

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Abstract

The vibration signal transmission mechanism has strong coupling, strong impact, and strong interference characteristics for diesel engine. Accurate signal characteristic extraction is the key to identifying and suppressing vibration sources. To address the issues of adaptability and accuracy of the Variational Mode Extraction (VME) method in handling diesel engine vibration signals, the peak frequency of the vibration signal was taken as the initial value of the center frequency, the correlation between the decomposed signal and the original signal was considered, and the peak to peak value, root mean square value, and peak factor of the decomposed components were used as the judgment indicators, the parameter adaptive variable mode extraction (PAVME) was proposed, and the accuracy and applicability of PAVME was verified by constructing simulated signals of diesel engine vibration characteristics in low signal to noise ratio environments. the abnormal vibration source of the gearbox was identified as gear meshing excitation based on PAVME and Power Spectral Density Function (PSD). Taking into account both the source of excitation and the transmission path, a scheme for suppressing the vibration of the transmission mechanism through shaft torsional vibration control was proposed.

Key words

Parameter Adaptive Variational Mode Extraction / Vibration / Diesel engine / Transmission Mechanism

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ZHOU Qidi, ZHANG Zhongwei, WANG Genquan, WANG Yanrong, ZHANG Limin, XU Chunguang. Abnormal vibration diagnosis of diesel engine transmission mechanism based on PAVME[J]. Journal of Vibration and Shock, 2025, 44(1): 143-150

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