调制边频带不对称性及对齿轮故障诊断影响的研究

Research on Asymmetry of Modulation Sideband and Its Influence on Gear Fault Diagnosis

从齿轮啮合频率作为载频信号出发,深入阐述调制边频带的产生机理及边频带在齿轮故障诊断中的重要意义。以齿轮极端断齿故障为例,进一步探讨调制边频带不对称性在齿轮故障诊断中的消极影响,为避免设备故障诊断中的漏判或误判造成设备损坏,综合采用细化频谱、时域波形、解调、倒谱等多种手段有效故障特征识别。通过实例证明了调制边频带不对称分布现实存在的影响,运用和总结其他多种故障诊断方法,消除齿轮故障诊断中边频带不对称性影响,对大量齿轮故障特征识别提供借鉴和指导意义。

Starting from gear meshing frequency as carrier frequency signal,the generation mechanism of modulation sideband and the significance of sideband in gear fault diagnosis were studied.Taking the gear extreme broken tooth fault as an example,the negative influence of modulation sideband asymmetry in gear fault diagnosis was further studied and discussed.In order to avoid the equipment damage caused by missing or misjudgment in equipment fault diagnosis,the fault feature recognition was effectively realized by using a variety of means,such as refining spectrum,time domain waveform,demodulation,cepstrum and so on.The influence of asymmetric distribution of modulation sideband with examples was proved.It is instructive to use and summarize other fault diagnosis methods to eliminate the influence of asymmetric distribution of sideband in gear fault diagnosis,which provides reference and guidance for a large number of gear fault feature recognition.