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.

• 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。