Structural damage identification based on power spectral density sensitivity analysis of dynamic responses

Structural damage identification based on power spectral density sensitivity analysis of dynamic responses
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基于动态响应功率谱密度敏感性分析的结构损伤识别

DOI:
10.1016/j.compstruc.2014.10.011
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发表时间:
2015
影响因子:
4.7
通讯作者:
J.K. Liu
J.K. Liu
中科院分区:
工程技术2区
文献类型:
--
作者:
Z. D. Zheng;Z.R. Lu;W.H. Chen;J.K. Liu

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提出了一种基于功率谱密度灵敏度分析的结构损伤位置和损伤程度识别方法。首先,采用虚拟激励法计算了结构在平稳激励和随机激励下的响应和功率谱密度。然后,得到了功率谱密度对结构损伤参数的灵敏度。最后,采用有限元模型修正方法,从计算的和模拟的实测功率谱密度识别结构损伤。两个数值例子表明,本文方法得到了满意的识别结果。
A new method is proposed to identify locations and severities of structural damages based on the power spectral density sensitivity analysis. Firstly, the structural responses and power spectral density under stationary and random excitations are calculated using pseudo excitation method. Then, the sensitivities of power spectral density with respect to the structural damage parameters are obtained. Finally, the finite element model updating method is adopted to identify the structural damages from the calculated and the simulated measured power spectral density. Two numerical examples demonstrate the satisfactory identification results obtained from the present method.
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