A two-step approach for crack identification in beam
A two-step approach for crack identification in beam
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DOI：
10.1016/j.jsv.2012.08.025
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发表时间：
2013-01
影响因子：
4.7
通讯作者：
X. B. Lu;J. Liu;Zhengqi Lu
中科院分区：
文献类型：
--
作者：
X. B. Lu;J. Liu;Zhengqi Lu
提出了一种基于振型曲率和响应灵敏度分析的梁结构裂纹识别的两步法。在第一步中，通过修正裂纹和完整梁的振型曲率之差来识别裂纹的位置。第二步，利用基于响应灵敏度的模型修正方法对裂纹位置和深度进行精确识别。通过对单裂纹和多裂纹的识别，验证了该方法的有效性。识别出的裂纹参数与真实值吻合较好。数值模拟结果表明，该方法对单裂纹和多裂纹的识别具有通用性，且对测量噪声不敏感。
A two-step approach based on mode shape curvature and response sensitivity analysis for crack identification in beam structures is presented in this paper. The location of the crack is identified from a modified difference between the mode shape curvatures of cracked and intact beams in the first step. Then, a response sensitivity based model updating method is utilized to identify the crack location and crack depth precisely in the second step. The proposed method is verified with both single crack and multiple cracks identification. The identified crack parameters are found to be in good agreement with the true values. Numerical simulations in this study show that the proposed method is versatile for both single crack and multiple cracks identification and it is insensitive to measurement noise.