HHT法的基本原理及其应用探讨

The Basic Principle of HHT Method and Application Discussion

以Timoshenko单跨梁为研究对象,采用回转射线矩阵法进行动力响应计算,针对Timoshenko梁的瞬态响应信号为非平稳信号,采用基于Hilbert-Huang变换原理的信号时频分析,并与FFT的处理结果进行对比分析。结果表明,HHT方法比FFT法更适合非平稳信号的分析和处理,同时,HHT方法不仅可以将瞬态信号中低频和高频部分分离出来,还可以通过Hilbert谱展示信号能量在时频域内的分布,更为深入的了解信号的本质。

Dynamic response of singlespan Timoshenko beam is calculated by rotaryray matrix method. Consider ing that transient response signal of Timoshenko beam is nonstationary signal timefrequency analysis based on HilbertHuang transformation principle is performed and is compared with the analysis based on FFF. The results showed that HHT method was more appropriate for analysis and process of nonstationary signal than FFT method.＇ HHT method not only might separate lowfrequency and highfrequency component from transient signal, but also might reflect energy distribution in timefrequency domain by Hilbert spectrum. So the nature of signal was com prehended further.