摘要
经验模态分解法虽然有许多优点,也已在一些领域取得了应用,但是,其本身可能还存在着一些问题,阻碍了它的进一步应用。文章探讨信号的位置敏感性问题,即两个信号随着它们叠加时相对位置的不同,使用经验模态分解后所得的结果是不同的。然后从基本原理出发,给出了信号的幅值、频率、相位和位置对分解能力影响的关系式,并用实验验证了这一关系式。
Although EMD(Empirical Mode Decomposition) is of many advantages and has been applied in many scientific fields,some of its defects become obstacle to further applications.The paper discusses its position-sensitive characters,namely that the decomposing results by EMD would be very different due to phase difference if the original superposed signal components are taken at different positions. According to EMD's basic principle,the influences of the amplitude,frequency,phase and position on the decomposition ability are investigated.Experiments were done and the results support the idea.
出处
《振动与冲击》
EI
CSCD
北大核心
2007年第2期21-24,共4页
Journal of Vibration and Shock
