Stiffness and Mass Matrices Identification of a Beam Structure with Defect
| Autor: | Pei-Hsin Hsu, 許培信 |
|---|---|
| Rok vydání: | 2002 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 90 Stiffness and Mass Matrices Identification of a Beam Structure with Defect Student : P. H. Hsu Advisor : S. T. Jenq This thesis is concerned with the damage identification of a simple beam structure in order to monitor the structural health condition. The damaged structural stiffness and mass matrices are to be identified based on the specified loading and measured response signals. The finite element beam model is simplified to a substructure model according to the Guyan reduction method and substructure method. The orthogonal polynomials approach is then used to extract the proposed distributed parameter model in question with structural response data. The identified structural stiffness and mass matrices for the reduced model with or without damage are furthermore transformed to the parameters which correspond to the global unreduced structural model by means of the back-propagation artificial neural network scheme or simple genetic algorithm. Based on the identified damaged structural stiffness and mass matrices, the damage locations and the degree of damage of the beam structure in question are then determined. Through the numerical validation, current identification process is capable of monitoring the structural health condition by using the time domain input and output signals. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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