A Study On The Hysteretic Behaviour And Controller In Magnetorheological Damper

Mangentorheological(MR) fluids are widely used in industry for its rheological behavior, and the MR damper, that is generated by it, is paid attention to which is used in vibration control area with the advantage of strong temperature adaptability, rapid response and low power consumption. However, as a result of MR damper Magnetic, the hysteresis effect of the phenomenon appeared, which makes the relationship between speed and damping force hysteresis and the output power and speed are not in one to one relationship. This hysteresis is a kind of nonlinear structure hysteresis, which you can not unfold by way of Taylor series linearization. Moreover, hysteresis is also related to the rate of load change, and it's difficult to active or semi-active control the device and structure of MR fluid or maybe in poor effect. In order to achieve design control strategy and to obtain good control effect, it is essential to establish an accurate description of properties of MR fluid dynamic model, and it also plays an important role in promoting the application of MR fluid.The first chapter introduces the development of MR damper conditions and application research, which elaborates on the purpose, significance and main content of it in detail.The second chapter mainly introduces certain research status regarding quo of the MR damper dynamic model, analyzing relative merits of various models and its impacts when analysis of controlling designs to the MR damper. According to nonlinear hysteretic behavior of MR damper, it selectively analyzes the second order ordinary differential equation model, which expressed the damper hysteretic dynamic behavior as a form of nonlinear ordinary differential equations. By numerical simulation analysis, it indicates that hysteresis loop can change depending on parameters.The third chapter first does experiment to the MR damper, and gets F-S access damper and F-V curves through test, which is base to of studying Hysteretic behavior of the nonlinear. Secondly, it focuses on the determination of the initial value of parameters that is to use experimental data and least square method to determine the initial value. Finally, experimental studies have shown that the simulation results of the model is consistent with the experimental results, and established model can accurately simulate the damper's dynamic behavior.Chapterâ…£firstly introduces Research of the MR damper control strategy. Secondly, according to the second order ordinary differential equation model, it generates two kinds of control strategy through changing the incentives and input current. Focusing on analysis of changing exciting current that is in the situation of input external loads, it makes the damper damping force expressed as the only formula with the excitation current and analyzed the impact on the damping force. The results show that the hysteresis curve of damping force and velocity have a good consistency with experimental data curve. According to the result, we can control the damping force through controlling current.