4.5 Article

Wavelet-based multi-scale finite element modeling and modal identification for structural damage detection

期刊

ADVANCES IN STRUCTURAL ENGINEERING
卷 20, 期 8, 页码 1185-1195

出版社

SAGE PUBLICATIONS INC
DOI: 10.1177/1369433216687566

关键词

damage detection; modal identification; model updating; multi-scale; wavelet; wavelet-based finite element model

资金

  1. National Key Research and Development Program of China [2016YF0701400]
  2. Natural Science Foundation of China [51508145]
  3. Innovation and Technology Commission of the HKSAR Government [1-BBY5]
  4. Research Institute for Sustainable Urban Development [1-ZVBN]

向作者/读者索取更多资源

Wavelet techniques enable multi-resolution analysis that can represent a function (either field or signal function) in a multi-scale manner. This article presents a damage detection method with dynamically changed scales in both temporal and spatial domains, by taking advantage of the wavelet-based multi-resolution analysis. This method combines a wavelet-based finite element model (WFEM) that employs B-spline wavelet as shape functions and wavelet-based modal identification method to detect structural damage progressively. High-fidelity modal information can be computed or identified with minimized computation cost by lifting the wavelet scales in the wavelet-based finite element model and in signal processing individually according to the actual requirements. Numerical examples demonstrate that the accuracy of damage detection is improved considerably by this lifting strategy during the damage detection process. Besides, fewer degrees of freedom are involved in the wavelet-based finite element model than those of traditional finite element method. The computational efficiency can be improved to large extent and computation resources can be utilized more rationally using the proposed multi-scale approach.

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