中文摘要：

频率分辨率是Hilbert时频谱表征信号的一个重要参数，即便对同一信号来说不同的频率分辨率会造成Hilbert时频谱有较大差异，并直接影响分析结果的准确性。但如何确定最佳的Hilbert时频谱频率分辨率，当前还鲜有研究。为了获取最佳Hilbert谱频率分辨率，提出了一种新的频率分辨率评价方法，建立冲击信号Hilbert时频谱频率分辨率的性能评价模型，以此为依据来获得最佳的Hilbert时频谱频率分辨率。最后，通过信号分析来验证此方法的有效性。

英文摘要：

The frequency resolution is a very important parameter of Hilbert time-frequency spectrum analysis. Different frequency resolutions will lead to different analysis results for the same signal. But how to determine the best frequency resolu- tion of Hilbert time frequency spectrum is seldom investigated by researchers. To determine the best Hilbert spectrum fre- quency resolution, a new performance estimation model is put forward for impact signal analysis in this paper. It can be used to determine the best frequency resolution of Hilbert time-frequency spectrum. In the end, signal analysis is used to testify the effectiveness of this model.