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    • Extraction of Features of Diesel Engine Faults Under Transient Operations Based on Order Tracking and Variational Mode Decomposition
    DOI：10.13949/j.cnki.nrjgc.2018.04.009
    Key Words:order tracking  variational mode decomposition(VMD)  transient operation  engine  feature extraction
    Author NameAffiliation
    REN Gang, JIA Jide, MEI Jianmin, JIA Xiangyu, HAN Jiajia，WEI Lantian 1.Fifth Cadet Brigade， Army Military Transportation University， Tianjin 300161， China
    2.Projection Equipment Support Department    ， Army Military Transportation University， Tianjin 300161， China；3.Auto College, Wuhan University of Technology, Wuhan 430070， China 
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    Abstract:A method based on the order tracking and variational mode decomposition(VMD) was proposed to solve the problem of non-smoothness of and big background noise in engine vibration signal. For the vibration signals of diesel engine crankshaft bearing fault and gasoline engine connecting rod bearing fault, a non-smooth signal in the time domain was converted into a pseudo smooth signal in the angular domain based on the order tracking. Then the converted signal was decomposed into several components with VMD, and the components that contain fault information were selected. The three dimensional spectral array of order, speed and power spectrum of the selected components was calculated, and the fault feature was extracted. The effectiveness of the proposed method was verified by simulation and experiment.
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