HHT是HuangE等提出的新的信号处理方法，适用于非线性非平稳的信号分析，被认为是近年来对以傅立叶变换为基础的线性和稳态谱分析的一个重大突破。-The new signal processing method, proposed by Huang E et al., is suitable for nonlinear and non-stationary signal analysis, which is considered as a major breakthrough in the li