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The traditional method of kurtosis is calculating the kurtosis value in the time domain. The larger the obtained value is, the stronger the corresponding impact characteristic. Afterward, in order to characterize the period of the signal, the correlation kurtosis is proposed by combining the correlation coefficient and kurtosis. In this paper, the correlation kurtosis is calculated in the frequency...
As a valid method of time-frequency analysis, Wavelet transform (WT) can offer great help for gearbox fault diagnosis. However, it requires much human expertise and prior knowledge to diagnose the faulty conditions of gearbox according to the time-frequency distribution. In addition, the coupling of different failures and noise makes it hard to accurately diagnose the running conditions of the gearbox...
The bearing fault, generating harmful vibrations, is one of the main causes of machine breakdowns. Therefore, performing bearing fault diagnosis is a key point to improve the reliability of the mechanical systems and reduce the corresponding operating expense. Recently, more and more studies focus on addressing this problem through detection transient signal by means of sparse representation (SR)...
The early wear fault signal of diesel engine is weak, and the fault can be reflected better by analyzing the acceleration signal, while the signal is unstable and cyclical. In order to analyze the signal characteristics better, a method of feature level enhancement is proposed. At first, change the acceleration signal into steady state signal by order resampling. Then, the time-frequency image of...
Lower time-frequency resolution is caused by Smoothed pseudo Wigner-Ville distribution (SPWVD) in suppressing cross-terms interference, which limits its application in the processing of the non-stationary vibration signals. This paper proposes a novel fractional-order smoothed pseudo Wigner-Ville distribution (FrSPWVD) to solve the above problem. The details about step of the calculation are as follows:...
With the degradation of electrical connector performance, the intermittent failure (IF) may occur in connector when subject to vibration, thermal and humidity stress. Intermittent failure is generally a precursor to a permanent fault (PF). During the whole life cycle of the electrical connector. The dynamic parameters such as frequency and duration of intermittent failure, evolve continuously with...
To overcome the limitations of manual features and obtain the operating characteristics of the equipment in complex operation processes, different deep learning models have been utilized for industrial data, improving classification accuracy yet causing some other limitations meanwhile. In this paper, a deep hybrid model named Stochastic Convolutional and Deep Belief Network (SCDBN), which assembles...
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