基于广义解调时频分析和瞬时频率计算的阶次谱方法在齿轮故障诊断中的应用

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (9) : 30-34.

论文

基于广义解调时频分析和瞬时频率计算的阶次谱方法在齿轮故障诊断中的应用

程军圣;李宝庆; 杨宇

作者信息 +

Application of the order spectrum method based on the generalized demodulation time-frequency analysis and the instantaneous frequency calculation to the gear fault diagnosis

Cheng Jun-sheng; Li Bao-qing; Yang Yu

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文章历史 +

摘要

针对齿轮启停过程中故障振动信号的调频特性，提出了基于广义解调时频分析和瞬时频率计算的阶次谱方法，并将其应用于齿轮瞬态信号的分析。广义解调时频分析是一种新的时频分析方法，它可以将多分量的信号分解为若干个瞬时频率具有物理意义的单分量信号，每个单分量信号可以是调幅-调频信号，因此非常适合处理多分量的调幅-调频信号。而当齿轮发生故障时，其启停过程中的振动信号就表现为多分量的调幅-调频特征。在基于广义解调时频分析和瞬时频率计算的阶次谱方法中，首先采用广义解调时频分析方法将齿轮瞬态信号分解为若干个单分量信号，然后计算各个分量的瞬时频率，再对其瞬时频率信号进行重采样，最后对重采样信号进行频谱分析得到阶次谱，从而提取齿轮振动信号的故障特征，判断齿轮的工作状态。仿真信号和实验信号的分析结果表明了该方法的有效性。

Abstract

Targeting the frequency demodulation characteristics of the gear fault vibration signal in the tart-stop process, the order spectrum method based on the generalized demodulation time-frequency analysis and the instantaneous frequency calculation is proposed and applied to the processing of the gear transient signal in this paper. The generalized demodulation time-frequency analysis approach which is a new signal processing method can decompose a multi-component signal into some single-component signals whose instantaneous frequency posse physics sense. Each single-component signal can be amplitude and frequency modulated signal. Therefore, the generalized demodulation time-frequency analysis approach is very suitable to process the multi-component amplitude and frequency modulated signals. When fault occurs in gear, the gear vibration signal in the start-stop process shows the multi-component amplitude and frequency modulated characteristics. In the order spectrum method based on the generalized demodulation time-frequency analysis and the instantaneous frequency calculation, firstly the multi-component signal is decomposed into some single-component signals by using the generalized demodulation time-frequency analysis method; secondly the instantaneous frequency of each single-component signal is calculated; thirdly each instantaneous frequency is resampled in angle-domain; finally the spectrum analysis is applied to each resampled signal and the order spectrum can be obtained. Hence, the fault characteristics of the gear vibration signal can be obtained and the gear work state can be identified according to the order spectrum. The analysis results form the simulated and experimental signals show the effectiveness of the proposed method.

导出引用

程军圣;李宝庆;杨宇. 基于广义解调时频分析和瞬时频率计算的阶次谱方法在齿轮故障诊断中的应用[J]. 振动与冲击, 2011, 30(9): 30-34

Cheng Jun-sheng;Li Bao-qing;Yang Yu. Application of the order spectrum method based on the generalized demodulation time-frequency analysis and the instantaneous frequency calculation to the gear fault diagnosis[J]. Journal of Vibration and Shock, 2011, 30(9): 30-34