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小波理论在工程中应用的特点之一是能对信号进行多维多分辨率分解及重构，能够用于提取信号的一些特征成份。基于这一优点，本文将小波包分解及重构理论应用于旋转机械冲击故障信号的处理，通过对试验数据的分析，得到了清晰、直观的系统冲击响应成份，与同时测得的声发射信号相对照，说明这一方法是有效的。
One of the characteristics of the application of wavelet theory in engineering is that it can decompose and reconstruct multi-dimensional multiresolution signals and can be used to extract some characteristic components of signals. Based on this advantage, this paper applies the wavelet packet decomposition and reconstruction theory to the processing of rotating mechanical impact fault signals. By analyzing the experimental data, the clear and intuitive system impulse response components are obtained, and the measured acoustic emission signals In contrast, that this method is effective.