Eigenparameter perturbation method for structural damage detection

Chun Nam Wong, Jay Chung Chen, Wai Ming To

Research output: Contribution to conferencePaperpeer-review

3 Citations (Scopus)


A methodology is developed for detecting single structural damage using the perturbation of eigenparameters. By Taylor's series expansion, the relationship between the eigenparameters perturbation and the damage parameters variations is established. The Jacobian matrix involved can be obtained by a sensitivity method or a perturbation method in different situations. The sensitivity method is demonstrated in damage detection of a cantilever beam structure. While the perturbation method is used in damage detection of a multi-bay truss. For evaluation of the capability of the algorithm, the method is applied on an experimental multi-bay truss model. The damage detection procedure is divided into two parts. The location of the damage is estimated by observing the region with the largest stiffness reduction. Then the extent of the damage is estimated by performing iterations of the damaged component. Using the first few fundamental eigenvectors, the extend of the damage converges rapidly to the exact value within several iterations.

Original languageEnglish
Number of pages10
Publication statusPublished - 1996
Externally publishedYes
EventAIAA/ASME/AHS Adaptive Structures Forum, 1996 - Salt Lake City, United States
Duration: 18 Apr 199619 Apr 1996


ConferenceAIAA/ASME/AHS Adaptive Structures Forum, 1996
Country/TerritoryUnited States
CitySalt Lake City


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