Damping Ratio and Frequency Identification Based on Particle Swarm Optimization

Abstract

This paper proposes a novel approach for structure modal parameter identification. The approach changes the identification problem to an optimal one. The global optimal solutions for the required parameters, including frequency, damping ratio, amplitude and phase of the structure can be obtained by taking the advantage of the Partical Swarm Optimization. The results of numerical simulation studies showed that the accuracy of this method is comparatively higher, and the adjacent modal coupling has no effect on its accuracy. The FIR lowpass has effect on the phase’s identification.