Experimental Study And Design Of MR Damper

Magneto-Rheological(MR) damper is a controllable device with MR fluid, it has the advantages of simple structure, quick response, low power consumption large dynamic range and can be simply controlled, it makes a semi-active suspension with sensors and controllers. The sensors feedback the information of vehicle status into the controllers, and a desired damping force is determined by a suitable algorithm, a corresponding excitation current is sent to MR damper to fulfill a target of semi-active control, and it can improve ride and handing stability performance of complete vehicle. In view of the progress of MR techniques, combined with the character of semi-active suspension, a MR damper is designed and manufactured. And make experimental investigation for the MR damper. The electromagnetic field of MR damper is analyzed by the ANSYS FEM. The main work and result of this dissertation including the following aspects:â‘ The rheological equations based on the plate and axisymmetrical model are derived from N-S equation in hydromechanics by applying the Newton fluid and Bingham plastic model. The design parameters are determined by means of the plate model. A MR shock absorber is designed and it's characteristics in different velocities are calculated and simulated.â‘¡According to the working modes of MR devices, combing the automobile MR damper, the MR damper for mini-bus is manufactured, its characteristics such as the damping force vs. displacement and the damping force vs. velocity is tested. The experiments show that the damping force can be controlled continuously by applying different electric field.â‘¢Aiming at the magnetic path structure, the electromagnetic field was analyzed by the ANSYS FEM. The magnetic field distribution of the MR fluids dampers of different structural models was analyzed. The results show that, the magnetic field characteristics of double class magnetic circuit MR damper is excellent. And different structural parameter also affects the magnetic field characteristics, such as piton, work cylinder.â‘£Analyzed the advantage of different model, by contrasting and analyzing parameter model and non-parameter model. The dynamics model of MR damper is established based in parameter model. Compared with theoretic curve and experimental data, it demonstrates that, the parameter model can be reasonably accurate over a wide range of operating conditions. The dynamics model could be a control model of damper for semi-active suspension.