小波分析在水力发电机组振动信号去噪中的应用

Application of Wavelet Analysis in Vibration Signal De-noise of Hydropower Unit

振动是水力发电机组的常见现象 ,其影响水电机组的稳定运行及安全运行。因此 ,振动的监测与诊断就显得十分重要。但是 ,振动传感器采集的信号受到机组运行现场的各种噪声污染 ,不能准确的反映机组运行状态。应用小波分析技术可以对噪声严重污染的振动信号进行去噪处理 ,精确地恢复原信号 。

Vibration is a common phenomenon of hydropower unit, which has effect on the stability and safety of hydropower unit operation. Hence, it is very important to monitor and diagnose the vibration. However, the signal collected by various kinds of vibration sensors is often polluted by the noises created on the site of unit operation, and it doesn′t exactly reflect the status of the unit vibration. The authors employ wavelet analysis in de_noising the vibration signal polluted by noise, and exactly recovering the original signal, which is proved to have good effect by trial.