旋转剪切式磁流变液阻尼器设计及力学模型

Design and mechanical model of a rotary-mode shear MR damper

设计、制作了阻尼力可调范围大、位移不受限制的旋转剪切式MR阻尼器,进行了MR阻尼器力学性能试验,提出了MR阻尼力库仑摩擦阻尼力峰值与输入电流的玻尔兹曼函数关系。分析了MR阻尼力时程,MR阻尼力与位移、速度关系,以及振动频率、幅值和电流对MR阻尼力的影响。对比MR试验值与基于玻尔兹曼函数Bingham模型值的关系,证明了基于玻尔兹曼函数的Bingham模型是合理的。

A rotary-mode shear MR damper was designed and manufactured to gain larger continuously adjustable damping force and unrestricted displacement.The Boltzmann function formulation for the relationship between the peak of coulomb friction damping force of the MR damper and its input current was investigated based on mechanical properties test results of the MR damper.The time history of the MR damping force,the relationship between the MR damping force and the displacement,the relationship between the MR damping force and the velocity,the impact of vibration frequencies and amplitudes,and the impact of input current were analyzed.By comparing experimental results of the damping force time history,the relation of the damping force and the displacement,and the relation of the damping force and the velocity,with Boltzmann function results of those,it was further proved that the Bingham model based on Boltzmann function is reasonable.