改进的EMD方法及大坝强震反应信号应用分析

英文篇名：Improved EMD and application in data processing of dam's strong earthquake response
中文刊名：中国水利水电科学研究院学报
英文刊名：Journal of China Institute of Water Resources and Hydropower Research
作者：许亮华 ; 郭永刚 ; 杜修力
英文作者：XU Liang-hua1 ; 2 ; GUO Yong-gang1 ; DU Xiu-li2(1.Earthquake Engineering Research Center ; IWHR ; Beijing 100048 ; China ; 2.The College of Architecture and Civil Engineering ; Beijing University of Technology ; Beijing 100124 ; China)
中文关键词：强震反应信号 ; 经验模式分解 ; 滤波处理 ; 模态混淆
英文关键词：Strong earthquake response ; empirical mode decomposition ; filtering ; Mode Mixing
出版日期：2011-09-15
机构：中国水利水电科学研究院工程抗震研究中心;北京工业大学建筑工程学院;
年：2011
期：03
出版单位：中国水利水电科学研究院学报

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。
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.

引文

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