Determining Location and Estimating Severity of Damage Using Sensitivities of Principal Components of Frequency Response Functions

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Nabiyan, Mansoureh Sadat | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 46883 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Rahimzadeh Rofouei, Fayyaz; Esfandiari, Akbar
Abstract:
Principal component analysis (PCA) is a conventional tool for dynamic system analysis. In this paper, a new damage diagnosis method is presented based on sensitivities of principal components obtained from PCA of Frequency response functions (FRFs). Damage identification, determination of its location and estimation of the damage severity are conducted by an innovative well established sensitivity relation of PCA results. Then, sensitivity matrix is obtained by using measured frequency of damaged structure, and comparison of PCA of the intact structure with PCA from FRFs which are measured at sensors locations. Damage location and its severity are calculated by model updating procedure. This method is applied on three structures of truss, beam and frame model to demonstrate the validity and capability of proposed method
Keywords:
Singular Value Decomposition (SVD) ; Structural Health Monitoring ; Damage Detection ; Frequency Response ; Principal Component Analysis (PCA) ; Sensitivity Function

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