Finite element method; Singular value decomposition; Response function; System identification; Structural analysis; Vibration
Abstract :
[en] Model updating techniques using frequency response function (FRF) data are studied in this paper. The numerical techniques are discussed for implementation with a large commercial finite element (FE ) code. System equivalent reduction expansion process is adopted to reduce the complete FE solutions onto the experimental degrees of freedom. The rank-deficiency difficulty with this method is overcome using either of two numerical techniques: diagonal perturbation and singular value decomposition. This second technique is also used in solving the updating equation. Experimental FRF data are compared with the FE solutions, and the updated model parameters are obtained via an iteration procedure. A simplified frequency domain assurance criterion is proposed to evaluate the correlation between the FE model and the measured structure at the chosen frequencies. After verifying the efficiency of the methods with several benchmark tests, the program is applied to an aeroplane model test. Some conclusions are given and remaining problems illustrated.
Disciplines :
Mechanical engineering Engineering, computing & technology: Multidisciplinary, general & others
Author, co-author :
Yan, Ai-Min; Université de Liège - ULiège > LTAS - Vibrations et Identification des Structures
Golinval, Jean-Claude ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > LTAS - Vibrations et identification des structures
Language :
English
Title :
Model Updating Based on Frequency Response Functions Using A General Finite Element Code
Publication date :
2003
Journal title :
European Journal of Mechanical and Environmental Engineering
ISSN :
1371-6980
Publisher :
Belgian Society of Mechanical and Environmental Engineering, Bruxelles, Belgium
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