中文摘要：

采用磁流变阻尼器（MRdamper）进行半主动控制分析时，建立较为精确的MRdamper力学计算模型是关键因素之一。目前常用的MRdamper力学计算模型有Bingham模型、Sig—moid模型、双Sigmoid模型与通用Sigmoid模型等，但这些力学计算模型均不能同时描述MRdamper的惯性效应、剪切稀化现象和蓄能器刚度影响等。基于此，提出了一个新的MRdamper力学计算模型——可调Sigmoid模型，并与现象模型试验结果进行对比研究。仿真计算结果表明：可调Sigmoid模型简单易理解，且能很好地描述MRdamper的惯性效应和剪切稀化现象，在描述低速区和高速区的非线性滞回特性时，所运用的物理概念更为清晰，具有很强的可调通用性。

英文摘要：

Magnetorheological （MR） damper was often used in the semi-active suspension system to attenuate the unwanted vibrations. However, it is important to establish a more accurate mechanical model for MR damper when it was applied in this situation. At present, Bingham model, Sigmoid model, double-Sigmoid model and general- ized Sigmoid model are the commonly used mechanical models for MR dampers. However, these models can not describe the phenomena that existed in the MR dampers, such as, the inertial effect, the shear-thinning phenome- non and the influence of the accumulator stiffness. Based on this, a new mechanical model, i.e. , the adjustable Sigmoid model was proposed. Meanwhile, the simulation results and experimental results of phenomenological model were also Conducted and compared. The simulation results demonstrate that the adjustable Sigmoid model can effectively describe the behavior of MR damper. It can embody perfectly the inertial effect and shear-thinning phenomenon of MR damper. When this model describes exactly the nonlinear hysteretic characteristics in the low- speed area and high-speed area, the applied physical concept becomes clearer. In a word, this adjustable Sigmoid mechanical model has a stronger applicability and adaptability as compared to the existed models.