MR damper based on a variable stiffness and damping of semi-active suspension control

With the auto industry, when people ride vehicles, ride comfort and handling stability and other properties put forward higher requirements. As an important influence on car performance car suspension design has become an important issue, and semi-active suspension with its low price, energy consumption, simple structure, and its performance is close to the advantages of active suspension of a suspension a top priority. The suspension stiffness is difficult to control, most of the current domestic and international research has focused on changing the semi-active suspension damping, and the simultaneous change of suspension stiffness and damping less. This article established a new type of semi-active suspension model, to achieve semi-active suspension stiffness and damping, while adjustable, were used to switch the damping control and fuzzy: Block simulation of the model system is obtained that the model can effectively improve Ride Comfort of the theoretical basis. On this basis, adding damper, further variable stiffness and damping properties of semi-active suspension. Firstly, access to wealth of information about the suspension on the basis of research literature, systematic analysis of domestic and semi-active suspension with magnetorheological Development and Research; the same time, the development of automotive suspension control technology to do some elaboration. Secondly, in the traditional semi-active suspension based on the addition of a parallel damper and spring system, by changing the system to achieve damping force adjustable suspension stiffness in order to establish the stiffness and damping can also change the semi-active suspension single degree of freedom 1 / 4 vehicle model. Off Damping controller design and fuzzy controllers, using the MATLAB software, the suspension of the two models under the control of the simulation analysis Evaluation ride through the suspension, in the frequency domain and time domain simulation results with both the passive suspensionThe simulation results were compared and analyzed using different control strategies to improve the ride comfort of vehicles on the merits. Again, the establishment of variable stiffness and damping of two degrees of freedom semi-active suspension 1 / 4 vehicle model, design the damping controller and fuzzy controller switch. White noise road input and sinusoidal input under the control of two semi-active suspension, respectively, the simulation analysis, and simulation results with the passive suspension and active suspension simulation results compared. Finally, in the semi-active suspension vehicle model added damper, MR damper through to achieve variable damping vehicle model.Establishment of MR damper dynamic model of Bouc-Wen amended, and the model were added to the switch control and the model degrees of freedom under the control of variable stiffness and damping of the second semi-active suspension, in both frequency and time domain aspects of the simulation results with the passive suspension and active suspension simulation results were compared to further verify the analysis by adding the variable MR damper semi-active suspension stiffness and damping performance. 

Key words: semi-active suspension, variable stiffness, variable damping, switch control, fuzzy control, MR damper