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Structural damage detection from coupling forces between substructures under support excitation

机译：根据支撑激励下子结构之间的耦合力检测结构损伤

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摘要

This paper proposes a method to identify the coupling forces between substructures from the acceleration response of a structure under support excitation, and the local structural damage is then detected from the identified coupling forces based on dynamic sensitivity analysis. The identification equation of the coupling forces is formulated in state space, and it is solved with the damped least-squares method. The sensitivity of the coupling forces between the substructures with respect to a local change in the system parameter is derived analytically. In addition, a model condensation method is used to reduce the number of coupling forces for a more practical application. A nine-bay three-dimensional truss structure serves as an example for validating the proposed method. Numerical simulations with noisy measured accelerations show that the coupling forces between substructures are very sensitive to local changes in the system parameters and the proposed method can accurately detect the location and extent of structural damage resulting from an improved computational efficiency and accuracy.
机译：本文提出了一种基于支撑激励下结构的加速度响应识别子结构之间耦合力的方法，然后基于动态灵敏度分析从识别出的耦合力中检测局部结构损伤。在状态空间中建立了耦合力的识别方程，并用阻尼最小二乘法求解。通过分析得出子结构之间的耦合力相对于系统参数局部变化的敏感性。另外，为了更实际的应用，使用模型凝结法来减少耦合力的数量。一个9托架三维桁架结构作为验证该方法的示例。带有嘈杂的测量加速度的数值模拟表明，子结构之间的耦合力对系统参数的局部变化非常敏感，并且所提出的方法可以准确地检测出由于提高的计算效率和精度而导致的结构破坏的位置和程度。

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  • 来源
    《Engineering Structures》 |2010年第8期|P.2221-2228|共8页
  • 作者

    S.S. Law; K. Zhang; Z.D. Duan;

  • 作者单位

    Civil and Structural Engineering Department, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, China;

    Civil and Structural Engineering Department, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, China School of Civil Engineering, Harbin Institute of Technology, Harbin, China;

    rnSchool of Civil Engineering, Harbin Institute of Technology, Harbin, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    damage detection; inverse problem; substructure; coupling force; sensitivity;

    机译：损坏检测;反问题子结构耦合力灵敏度;

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