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磁流变液减振器作为一种阻尼力可调的减振器,具有反应迅速,能适用于振动系统的实时控制等特点。由于磁流变液不仅有牛顿流体的特征,而且有塑性流体的特征,使得磁流变液减振器的阻尼力呈非线性特点。应用迟滞黏性模型来表示磁流变液减振器阻尼力特性;在此基础上模拟计算了用于车辆座椅系统的磁流变液减振器在不同控制状态下的座椅特性,结果显示不加电压时的磁流变液减振器(soft)座椅在B、C级路面整个振动频率的加速度的RMS(均方根)值较小,而相对位移的RMS值较大。施加3V电压时的磁流变液减振器(hard)座椅表现出较大的等效黏性阻尼;此时B、C级路面整个振动频率的加速度的RMS值较大,而相对位移的RMS值较小。采用半主动减振器的磁流变液减振器(on-off)座椅表现出较优的减振特性;此时整个振动频率的加速度的RMS值较小,相对位移的RMS值也较小。
Magnetorheological fluid damper as a damping force adjustable shock absorber, with rapid response, can be applied to the vibration control system and other real-time characteristics. Magneto-rheological fluid not only has the characteristics of Newtonian fluid but also has the characteristics of plastic fluid, making the damping force of magnetorheological fluid damper nonlinear. The hysteresis viscosity model is used to represent the damping force characteristics of MR damper. Based on this, the seat characteristics of MR damper for vehicle seat system under different control conditions are simulated. The results The RMS (root mean square) value of the acceleration of the magnetorheological soft seat without voltage at the entire vibrational frequencies on the B and C road surfaces is smaller, while the RMS value of the relative displacement is larger. The magnetorheological fluid (hard) seat exhibits a large equivalent viscous damping when a voltage of 3V is applied. At this time, the RMS values of the accelerations of the entire vibrational frequencies of road surface B and C are larger, while the relative displacement RMS value is smaller. The magnetorheological fluid on-off seat with semi-active shock absorber shows better vibration damping characteristics; at this time, the RMS value of the acceleration of the whole vibration frequency is smaller and the RMS value of the relative displacement is also smaller small.