By using multiple overlapped SPWVD Windows, the effect of cross-term interference in the time-frequency analysis was minimized.

通过将多个时频分析的窗口重叠来克服时频分析中交叉项的影响。

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Analysis based on the failure characteristics indicates that the nylon gum on bottom of dovetail and the long term operation can significantly reduce the natural frequency of blade.

故障分析表明：经长期使用的叶片在修理厂大修时，为满足叶片摆动量要求在榫头底面涂尼龙胶，会使叶片自振频率有较大幅度下降；

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