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分别研究了用平滑Wigner分布和小波变换分析跌落零件冲击信号的方法，比较了各种分析方法的特点。结果表明，这些时频域分析方法有很多优越性，但是也存在一些有待进一步研究的问题。
The method of analyzing the impact signal of the drop part by using the smoothed Wigner distribution and the wavelet transform is studied respectively, and the characteristics of the various analysis methods are compared. The results show that these time-frequency analysis methods have many advantages, but there are some problems to be further studied.