A two-step bearing fault diagnosis strategy under variable speed based on symplectic geometry modal decomposition and practical fault feature extraction framework

Author:

Huang Shuai,Li JunxiaORCID,Wang Yandong,Qin Zhixiang

Abstract

Abstract Strong noise interference can lead to failure of bearing fault diagnosis techniques. This paper proposes a two-step fault diagnosis strategy to address the challenge of weak fault feature extraction in bearing fault diagnosis using acoustic or vibration data at varying speed. Firstly, the paper introduces a short-time symplectic modal decomposition (stSGMD) method that utilizes fractional Fourier transform (FrFT). This method involves signal processing with short-time windowing to extract fault-sensitive components. The window is then expanded to obtain the complete component through fractional Fourier domain (FrFD) narrow-band filtering based on energy concentration in the FrFD. A novel entropy index, named standard deviation discrete entropy (SDDE), is introduced to quantify the intensity of fault shocks in non-stationary signal and is used to select components in the stSGMD. Subsequently, a fault feature extraction framework called global objective deconvolution (GOD) is presented for extracting instantaneous fault features at varying speed. This method establishes a global objective matrix for the extraction process. The GOD is utilized to deconvolute the complete fault-sensitive component, followed by envelope order analysis for demodulating the fault feature order. Numerical simulations and experimental studies on acoustics and vibration are performed. The results demonstrate that stSGMD improves the demodulation capability of SGMD, while GOD effectively extracts fault features. It is expected that the presented method will be effectively utilized for fault feature extractions in bearings operating under linear variable speed conditions.

Funder

National Natural Science Foundation of China

Central Guidance on Local Science and Technology Development Fund of Shanxi Province

Science and Technology Innovation Leading Talent Team Program of Shanxi Province

Key Scientific and Technological Research and Development Plan of Jinzhong City

Publisher

IOP Publishing

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