传统的振动分析常采用傅立叶分析法，对于柴油发动机某些非平稳振动信号，傅立叶分析可能给出虚假的结果，从而导致错误诊断。
As for some of the unsteady vibration signals of diesel engine, false result may be provided by using Fourier analysis, thus error diagnosis would be induced.
把小波包分析技术应用到实际非平稳振动信号分析中，取得了良好的效果，最后讨论了分析技术实现的一些具体问题并给出了结论。
The technique of wavelet packets analysis is used to analyze unsteady vibration signal, and the results are well. At last, some respects of realizing the analysis techniques are discussed.
本文研究了非平稳随机振动信号的瞬时功率谱。
The instantaneous power spectrum of nonstationary random vibration signals is discussed in this paper.
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