Nonlinear modeling of a rotational MR damper via an enhanced Bouc-Wen model

作者：Miah Mohammad S^*; Chatzi Eleni N; Dertimanis Vasilis K; Weber Felix

来源：Smart Materials and Structures, 2015, 24(10): 105020.

DOI：10.1088/0964-1726/24/10/105020

• magnetorheological damper
• nonlinear hysteretic response
• Bouc-Wen type models
• sigmoid function
• vibration mitigation

The coupling of magnetorheological (MR) dampers with semi-active control schemes has proven to be an effective and failsafe approach for vibration mitigation of low-damped structures. However, due to the nonlinearities inherently relating to such damping devices, the characterization of the associated nonlinear phenomena is still a challenging task. Herein, an enhanced phenomenological modeling approach is proposed for the description of a rotational-type MR damper, which comprises a modified Bouc-Wen model coupled with an appropriately selected sigmoid function. In a first step, parameter optimization is performed on the basis of individual models in an effort to approximate the experimentally observed response for varying current levels and actuator force characteristics. In a second step, based on the previously identified parameters, a generalized best-fit model is proposed by performing a regression analysis. Finally, model validation is carried out via implementation on different sets of experimental data. The proposed model indeed renders an improved representation of the actually observed nonlinear behavior of the tested rotational MR damper.

• 出版日期2015-10