The Research Of Magneto.rheological Damper's Time Delay And Control

Recently, the semi-active suspension with MR damper is the suspension system research focus and one of the vital developing aspects.MRF damper is an important executive component of the semi-active suspension.The dynamic and static trait and wider tuning range of the magnetic fluid damper depends greatly on damper excellent control effect. In view of the fast response and wider tuning range,the design of the MRF damper is one of the key issues in the damper system development. Researching, designing, and developing the MRF damper is of importance in theory and practice. The main achievements involve the following aspects:â‘ It simply analyzes the current status of domestic and foreign countries of the size, control method of the damper delays. It puts forward the main research work, In this paper,it analyzes the response time and affecting factors of the MRF by hydrodynamics.The influencing factors include magnetically confining and eddy currents losses. Two structural designs to reduce the delay are put forward. The theoretic analysis demonstrates the efficiency of the designs.â‘¡To improve dynamic and static characteristics of the MRF damper, the magnetic circuit configuration designing scheme is introduced. By using finite element analysis of engineering electromagnetic field, the design of magnetic structure is validated.Finite-element analysis in electromagnetic fields shows that:the scheme will increase the damp routeway and inprove the damper static performance.â‘¢In this paper,the influence of the time-delay of MRF damper on the system dynamic characteristic are analyzed. By vibrational analysis and building the control system dynamic model, Smith fuzzy control strategies are proposed to reduce the time-delay. The simulation results confirm that above-mentioned control strategy with delay compensation is effective.