基于改进Hilbert-Huang变换的结构损伤识别方法研究

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (18) : 195-199.

论文

任宜春1，2 ，翁璞2

作者信息 +

Structural Damage Detection Based on Improved Hilbert-Huang Transform

Ren yichun1 2 ，Weng pu2

Author information +

文章历史 +

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

For the problem of mode mixing during signal analysis by Hilbert-Huang transform(HHT), an improved HHT method base on ensemble empirical mode decomposition（EEMD）is introduced. The method is applied to identification of structural damage. A three degree of freedom bilinear stiffness degradation model of shear type structure was established. Structural responses under earthquake were calculated and analyzed by improved HHT. A method to detect the location of damage based on intrinsic mode function (IMF) energy is proposed. It was shown that whether or not a structure is damaged and when the damage occurs can be decided by instantaneous frequency of structural acceleration; the location of damage is detected by variation of corresponding IMF energy to the first model frequency of structural response before and after damage. Damage of an actual engineering under earthquake was identified by the first model instantaneous frequency and the first model IMF energy.

导出引用

任宜春1，2,翁璞2. 基于改进Hilbert-Huang变换的结构损伤识别方法研究[J]. 振动与冲击, 2015, 34(18): 195-199

Ren yichun1 2,Weng pu2. Structural Damage Detection Based on Improved Hilbert-Huang Transform[J]. Journal of Vibration and Shock, 2015, 34(18): 195-199

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