A hybrid Particle Swarm Optimization - Simplex algorithm (PSOS) for structural damage identification

Authors:
O. Begambre;J. E. Laier
Affiliations:
São Carlos Engineering School, Department of Structures, University of São Paulo, São Carlos-SP, Brazil and Escuela de Ingenieria Civil, Universidad Industrial de Santander, Bucaram ...;São Carlos Engineering School, Department of Structures, University of São Paulo, São Carlos-SP, Brazil
Venue:
Advances in Engineering Software
Year:
2009

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Abstract

This study proposes a new PSOS-model based damage identification procedure using frequency domain data. The formulation of the objective function for the minimization problem is based on the Frequency Response Functions (FRFs) of the system. A novel strategy for the control of the Particle Swarm Optimization (PSO) parameters based on the Nelder-Mead algorithm (Simplex method) is presented; consequently, the convergence of the PSOS becomes independent of the heuristic constants and its stability and confidence are enhanced. The formulated hybrid method performs better in different benchmark functions than the Simulated Annealing (SA) and the basic PSO (PSO"b). Two damage identification problems, taking into consideration the effects of noisy and incomplete data, were studied: first, a 10-bar truss and second, a cracked free-free beam, both modeled with finite elements. In these cases, the damage location and extent were successfully determined. Finally, a non-linear oscillator (Duffing oscillator) was identified by PSOS providing good results.