变速箱轴承故障诊断中小波分析方法

Wavelet Analysis Method in Fault Diagnosis of Gearbox

针对自行火炮变速箱工作时背景噪声非常大,测取的振动信号信噪比很低,被检信号常常淹没在背景噪声中,特征信号难以提取的问题,提出了采用小波形状与冲击信号非常相似的 Morlet 小波作为基小波,对变速箱振动信号进行连续小波变换,通过实例证明了此方法非常有效。

When self-propelled gun gearbox is working,the signal noise ratio(SNR)of vibration sig- nal available is very low.The signal is overwhelmed by strong background noise,so it is difficult to be picked-up.The paper brings forward Morlet wavelet as base wavelet,which is similar to impact signal. The Morlet wavelet is used to process vibration signal of gearbox.The result of a sited example proves its validity.