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本文描述了振动信号分析的时频域方法，证明了时频域方法是识别滚动轴承和齿轮故障的有效方法。研究表明短时Ｆｏｕｒｉｅｒ谱和Ｗｉｇｎｅｒ分布都能用于将时域信号变换到时频域，但是对于时变信号，应用Ｗｉｇｎｅｒ分布更为适宜。
This paper describes the time-frequency domain method of vibration signal analysis and proves that time-frequency domain method is an effective method to identify rolling bearing and gear failure. The results show that both the short-time Fourier spectrum and the Wigner distribution can be used to transform the time-domain signal into the time-frequency domain, but Wigner distribution is more suitable for time-varying signals.