【摘要】 基于经验模态分解(EMD)的希尔伯特黄变换(HHT)方法能够较好地分析非平稳和非线性的信号。在EMD分解过程中易产生模态混淆现象,影响了信号分析结果的准确性。本文通过对EMD分解过程进行改进,在分解进程中增加滤波手段有效抑制了模态混淆现象,应用仿真信号实例进行对比分析表明抑制效果明显。最后,应用该改进方法对大坝强震反应信号进行分析,研究大坝在强震下特性变化规律。更多还原

【Abstract】 Hilbert huang transform(HHT) based on empirical mode decomposition(EMD) is considered more effective in dealing with non-stationary and non-linear signal.Thus the mode mixing phenomenon is often generated in the process of EMD,which affects the accuracy of analytical results.In this paper,the mode mixing phenomenon can be restrained effectually by adding filters in the process of EMD.Examples of simulation signal analysis verified the effect.Finally,the strong earthquake response data of dam were analyzed to study the seismic response laws of dam through the practical application of the improved HHT method.更多还原