用谱方法计算流体力学一些流动现象的整体稳定性,采用累计贡献率的方法，分析了该信号的时域、频域、倒谱，循环谱等。- Spectral methods of computational fluid dynamics flow of some of the overall stability of the phenomenon, The method of cumulative contribution rate Analysis of the signal time domain, frequency domain, cepstrum, cyclic spectrum, etc.