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首页> 外文期刊>Journal of Sound and Vibration >A sensitivity-based structural damage identification method with unknown input excitation using transmissibility concept
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A sensitivity-based structural damage identification method with unknown input excitation using transmissibility concept

机译：基于透射率概念的基于未知输入激励的基于灵敏度的结构损伤识别方法

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摘要

Unknown input excitation and local damages universally coexist in a practical situation. Therefore, in this paper a structural damage identification method based on the transmissibility concept in state space domain is proposed without the need for input measurements. On the basis of the transformation matrix which is computed using the system Markov parameters in state space, the relationship between two different sets of acceleration response measurements can be formulated under the same input excitation. A sensitivity-based model updating approach is applied to identify the local damages by minimizing the difference between the measured response and the reconstructed response. The sensitivity of the dynamic acceleration response with respect to the elemental stiffness factors is derived analytically in the state space domain, which accelerates the process of damage identification. A numerical cantilever beam is employed to validate that the variation of structural parameters induced by the local damages can be accurately and effectively identified without the input excitation information by the proposed method even with measurement noise considered. A laboratory test is further carried out to verify the proposed structural damage identification method based on the response reconstruction technique.
机译：在实际情况下，未知的输入激励和局部损坏普遍并存。因此，本文提出了一种基于透射率概念的状态空间域结构损伤识别方法，无需进行输入测量。基于在状态空间中使用系统马尔可夫参数计算的变换矩阵，可以在相同的输入激励下公式化两组不同的加速度响应测量值之间的关系。基于灵敏度的模型更新方法可通过最小化测量响应与重构响应之间的差异来识别局部损坏。动态加速度响应相对于基本刚度因子的敏感度是在状态空间域中解析得出的，从而加快了损伤识别的过程。采用数字悬臂梁可以验证即使考虑了测量噪声，也无需输入激励信息，就可以准确有效地识别出由局部损伤引起的结构参数变化。进一步进行了实验室测试，以验证基于响应重建技术的结构损伤识别方法。

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