Parametric Identification of Bouc-Wen Model and Its Application in Mild Steel Damper Modeling

Bouc-Wen model is one of the most widely used parametric models of hysteresis in mechanics. In this paper, the normalized Bouc-Wen model is primarily introduced, while its parameters are illustrated by its physical meaning. Also the sensitivity of the parameters is investigated through a series of numerical simulation. For a better understanding, the Bouc-Wen model is made a contrast with bilinear model. Then an approach for identifying the parameters of the Bouc-Wen model is proposed, which is based on the least square method. And the mild steel damper is modeled by Bouc-Wen model, whose parameters are identified through the proposed approach. The accuracy and effectiveness of the approach have been demonstrated by using experimental data. Comparing the simulation and test, it is concluded that the Bouc-Wen model is capable of describing the nonlinear behavior of mild steel damper.