Sensing inaccessible damage in a structure using frequency response functions

Ser Tong Quek; Xiaoyan Hou

doi:10.1117/12.715464

19 April 2007 Sensing inaccessible damage in a structure using frequency response functions

Ser Tong Quek, Xiaoyan Hou

Proceedings Volume 6531, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2007; 653103 (2007) https://doi.org/10.1117/12.715464
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2007, San Diego, California, United States

Abstract

The use of Frequency Response Functions (FRFs) measured at some points in the accessible area of a structure to detect damage in the inaccessible area is studied, based on the difference in the normalized FRFs from a previous observed state. Numerical simulations and experiments were carried out to investigate the effectiveness of the proposed damage index. Results showed that from the indices at the first flexural resonance mode and in the vicinity of the first resonant frequency, the damage can be accurately detected and located if there is damage in the accessible area. If the damage is in the inaccessible area, the existence of the damage can be successfully ascertained although its location may not be identified accurately. For multi-damage conditions, with damage in both the accessible and inaccessible areas, the proposed method can accurately detect and locate the damage in the measurable area and detect the damage in the inaccessible area. The magnitude of the indices provides useful information with regards to the damage severity.

Citation Download Citation

Ser Tong Quek and Xiaoyan Hou "Sensing inaccessible damage in a structure using frequency response functions", Proc. SPIE 6531, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2007, 653103 (19 April 2007); https://doi.org/10.1117/12.715464

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KEYWORDS

Ferroelectric polymers

Calibration

Sensors

Numerical simulations

Structural health monitoring

Dielectrics

Aluminum

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