短时傅立叶变换在大型水轮发电机组振动分析中的应用

针对水轮发电机组工作环境的特殊性、引起振动原因的多元性及复杂性,根据短时傅立叶的线性时频变换特性,将时频分析理论应用于水轮发电机组的振动分析.以实际工程中的水轮发电机组为例,应用短时傅立叶变换分析机组的振动信号,结果图清晰直观地表现了机组的振动情况,为水轮发电机组的故障诊断提供了理论和现实依据.

Application of short-time Fourier transform in the vibration analysis of the large hydroelectric machine

Due to the particularity of the running environment of large hydroelectric machines, the reasons leading to vibration are various and complex. According to the linear time frequency transform characteristic of the short-time Fourier transform, the time frequency theory is applied to the vibration analysis of the large hydroelectric machine. A hydroelectric machine used in practical engineering is taken as an example. The vibration response signals of the hydroelectric machine are analyzed by the short-time Fourier transform, and the results of achieved figures illustrate the vibration conditions of the hydroelectric machine cle.arly and directly. The presented method provides a theoretical and practical basis for the fault diagnosis of hydroelectric machines