基于共振区幅值-相位解调技术的早期齿轮齿根裂纹故障检测

EARLY DETECTION OF GEAR TOOTH CRACKING FAULT BASED ON RESONANCE BAND AMPLITUDE-PHASE DEMODULATION TECHNIQUE

常用齿轮故障诊断方法中窄带解调分析存在低频干扰的问题,共振解调分析不涉及相位调制信息。针对传统方法的不足,提出了一种以共振频率作为载波的共振区幅值-相位解调技术。方法首先通过快速谱峭度算法寻找齿轮振动信号的共振区,然后在共振区中通过幅值最大搜索法获得共振频率,并以该共振频率为载频进行解调分别得到幅值和相位调制信号。该方法结合共振区对弱信号的放大以及对低频干扰的隔离作用,可有效提取齿轮的故障信息。仿真及试验研究表明,所提出的共振区幅值-相位解调技术可以有效检测早期齿轮齿根裂纹故障信息,是对传统方法的有效补充。

Several traditional gear diagnosis methods are reviewed. The narrow band demodulation method is often accompanied with low-frequency interference and the resonance demodulation technique is limited in amplitude demodulation.According to the pros and cons of the traditional methods,the resonance band amplitude-phase demodulation technique was proposed for local gear fault detection to compensate the current gear diagnosis methods. It＇s a method that taking the resonance frequency as carrier frequency instead of meshing harmonics,hence the low-frequency interference can be suppressed. Amplitude demodulation incorporated with phase demodulation will make the diagnosis more accurate. In this scheme,the fast kurtogram is firstly used to find out the resonance band. Then take the resonance frequency as carrier frequency and implement the resonance band amplitude-phase demodulation program gets both the amplitude and phase modulation functions,which would indicate the gear fault. Simulation and experiment studies indicated that the proposed method is an effective tool for early gear tooth cracking fault detection.