Parameter sensitivity analysis and optimum model of the magnetorheological damper's Bouc-Wen model

To overcome the shortcomings of the Bouc-Wen model, such as too many parameters, complex identification process, and long time consuming, the sensitivity of parameters was analyzed. A Bouc-Wen optimum model with sensitive parameters to guarantee calculating accuracy was established. First, according to the results of the magnetorheological damper's mechanical property test, the sensitivity of Bouc-Wen model's parameters was analyzed by the one-at-a-time method. Optimization of the Bouc-Wen model was completed. Second, the parameters of the Bouc-Wen optimum model were identified under three harmonic excitations. Compared with the original Bouc-Wen model, the differences of calculation accuracy were 0.0055, 0.0007, and 0.0070 respectively. And the convergence rate of the fitness function for parameter identification increased by 67.89%, 49.94%, and 67.24%, respectively. And the iteration time of 1000 iterations was shortened by 36.52%, 25.95%, and 64.11%, respectively. It indicates that the Bouc-Wen optimum model had higher efficiency and certain accuracy in parameter identification process. Then, the calculation accuracy of Bouc-Wen optimum model with independent and coupled mean parameters were analyzed respectively. Finally, the parameters of the Bouc-Wen optimum model and current were fitted by the least square method. The results showed that the Bouc-Wen optimum model can accurately and efficiently simulate the dynamic characteristics of magnetorheological dampers.