General Parameterized Synchrosqueezing Transform and Its Application in Rotating Machinery Vibration Signal

doi:10.3901/JME.2019.11.149

Abstract

Abstract: Though general parameterized time-frequency analysis is able to improve the energy concentration of time-frequency (TF) representation by the matched parameterized kernel, restricted by the structure of window function in short term Fourier transform, the energy diffusion phenomenon always occurred in the instantaneous frequency (IF). Synchrosqueezing transform can squeeze the diffused TF energy into the IF. However, it only works on the purely harmonic signal. To enhance the concentration of TF energy distribution, a general parameterized synchrosqueezing transform by combining the merits of both TF techniques is proposed. Considering the rotating vibration signal can be mostly viewed as a multi-component signal, an iterative technique is used to analyze the TF energy distribution of each mono-component and then a superposition of the TF energy distribution of each mono-component is viewed as the final TF representation of rotating machinery. The effectiveness of the proposed method is validated by numerical simulated signal, rotor misalignment and bearing outer race fault vibration signal under speed-varying condition.

Key words: general parameterized synchrosqueezing transform, general parameterized time-frequency transform, rotating machinery vibration signal, synchrosqueezing transform

CLC Number:

TH17

YU Kun, LUO Zhitao, LI Hongfei, MA Hui. General Parameterized Synchrosqueezing Transform and Its Application in Rotating Machinery Vibration Signal[J]. Journal of Mechanical Engineering, 2019, 55(11): 149-159.

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