基于改进Hilbert-Huang变换的结构损伤识别方法研究

发布时间：2018-03-22 19:32

本文选题：Hilbert-Huang变换　切入点：总体经验模态分解　出处：《振动与冲击》2015年18期 　论文类型：期刊论文

【摘要】：针对Hilbert-Huang变换(HHT)在信号处理中存在的模态混叠的问题,引入总体经验模态分解(EEMD)对HHT方法进行改进,并将改进的HHT方法应用于工程结构损伤识别中。建立一个三自由度剪切型结构模型,结构刚度退化模型采用双线性刚度退化模型,计算结构在地震作用下的响应,对结构加速度响应进行改进的HHT分析,提出了利用损伤前后结构响应一阶固有模态函数(IMF)特征能量比识别结构损伤位置的方法。结果表明:通过结构响应瞬时频率的变化可以判断结构是否损伤和出现损伤的时间,根据损伤前后各层一阶IMF能量比的变化可以识别损伤的位置。将改进的HHT应用到对实际工程的强震记录分析中,通过提取一阶瞬时频率和一阶IMF特征能量比较好地识别了结构在强震作用下的损伤。
[Abstract]:Based on Hilbert-Huang transform (HHT) mode exists in the signal processing of the aliasing problem, introducing the overall empirical mode decomposition (EEMD) of the HHT method is improved, and the improved HHT method is applied to structural damage detection. The establishment of a three DOF shear structure model, the structural stiffness degradation model a bilinear stiffness degradation model, the analysis of structure response under earthquake, response to the acceleration of the structure analysis of improved HHT, put forward the structure before and after damage response of intrinsic mode function (IMF) with characteristic energy ratio identification method. The damage location of the node. The result indicates that the structure changes in response to the instantaneous frequency can determine the structure whether the injury and injury time, according to the injury changes before and after each layer of the first-order IMF energy ratio can identify the damage position. The improved HHT is used to record the actual project of strong earthquakes In the record analysis, the damage of the structure under strong earthquake is identified by extracting the first order instantaneous frequency and the first order IMF characteristic energy.

【作者单位】：长沙理工大学桥梁工程湖南省高校重点实验室;长沙理工大学土木与建筑学院;
【基金】：桥梁工程湖南省高校重点实验室(长沙理工大学)开放基金资助项目
【分类号】：TU317

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