Abstract:Due to the parameter redundancy in the traditional Bouc-Wen model, a normalized form of the Bouc-Wen model was introduced.Then the relations between the parameters of the normalized Bouc-Wen model and the hysteretic parameters of the corresponding metallic damper were studied.A parameter sensitivity analysis was also conducted for the normalized Bouc-Wen model by using the local sensitivity analysis method based on two different sensitivity indices.A parameter fitting method was also proposed using a modified simulated annealing algorithm and verified by experiments.The results show that the initial elastic stiffness kd and the yield force Fdy are determined by the parameters kx, kw and ρ in the normalized Bouc-Wen model, the post-yield stiffness k′d is determined by the parameter kx, the yield displacement udy is determined by the parameter ρ, the relation between the shift stiffness ks and the initial elastic stiffness kd is determined by the parameter σ, and the smoothness of the transition from elastic to plastic response is determined by the parameter n.The parameters kw and ρ exhibit higher sensitivity, while σ, kx and n exhibit lower sensitivity.The modified simulated annealing algorithm is able to identify the parameters of the normalized Bouc-Wen model effectively, and the simulation hysteresis curves fit well with those by experiments.
李宗京 1,2,舒赣平 1,2. 正则化Bouc-Wen模型的参数研究及其在金属阻尼器中的应用[J]. 振动与冲击, 2018, 37(22): 128-135.
LI Zongjing1,2,SHU Ganping1,2. Parametric study of the normalized bouc-wen model and its application in metallic dampers. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(22): 128-135.
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