一种振动信号新变换法的研究

该文借助振动信号模型直观地阐明瞬时频率的物理意义，引出固有模态的及其应满足的条件；介绍Norden.E.Huang等人提出的关于固有模态瞬时频率的求法^1]，关于信号组成的创造性假设及Hilbert-Huang变换信号分析法的主要内容，经验模态分解的过程和希尔伯特谱，边际谱的概念等；分析Hilbert-Huang变换的有效性，先进性和目前急需解决的问题，给出Hilbert-Huang变换的计算机实现流程图，最后通过分析实例检测HibertHuang变换的有效性和优越性。

Study on a New Transform Method for Vibration Signal

In this paper, one directly clarifies the physical meaning of IF and educes the concept of intrinsic mode and the conditions that it should satisfy by the vibration signal modes. one introduce the method of obtaining IF of the intrinsic mode, the creationary hypothesis published by Norden E. Huang et al on the compose of signal, the main content of the HHT, the procedures of the Empirical Mode Decomposition (EMD), the concepts of Hilbert spectral and marginal spectral and so on. One analyzes the validity, advantages and the present key issue of the HHT. One gives the flow chart of the HHT that can be used to program on the computer. Finally, one demonstraets the validity and advantages of the HHT by analyzing some examples.