Suppressing damage identification errors from selected natural frequencies and mode shape points

Suppressing damage identification errors from selected natural frequencies and mode shape points
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抑制所选固有频率和模态振型点的损伤识别错误

DOI:
10.1080/17415977.2011.589902
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发表时间:
2012-10
影响因子:
1.3
通讯作者:
Longqi Wang
Longqi Wang
中科院分区:
工程技术4区
文献类型:
--
作者:
Zhihai Xiang;Masheng Zhou;Longqi Wang

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提出了一种基于结构固有频率和振型点的损伤识别方法。根据该方法的适定性分析,提出了一种求解固有频率和振型点最优组合的算法。然后,提出了一种由最优点选取、损伤识别和测量噪声更新组成的综合方案。这样,由于测量噪声的损伤识别错误可以大大抑制。数值算例表明,虽然结构损伤参数对测量噪声特别是固有频率噪声非常敏感,但只要合理选取固有频率和振型点,该方法就能可靠地识别出结构损伤参数。
This article presents a damage identification method based on structural natural frequencies and mode shape points. According to the well-posedness analysis of this method, an algorithm is proposed to find the optimal combination of natural frequencies and mode shape points. Then, an integrated scheme that consists of the optimal point selection, the damage identification and the measurement noise updating is presented. In such a way, the damage identification errors due to measurement noises can be greatly suppressed. Numerical examples demonstrate that although structural damage parameters are very sensitive to the measurement noises, especially the noises in natural frequencies, they can be reliably identified if the natural frequencies and mode shape points are properly selected using the proposed method.
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