Design And Experiment Of The Pumping Magnetorheological Damper

The performance of the automobile suspension is one of the most important features to automobile’s quality. It affects the automobile’s ride comfort, steering stability and driving safety. Suspension is for minimizing the impact of the excitation from the road to the body. The traditional passive damper can’t produce change according to the external conditions, which has certain limitations in practice.The semi-active suspension system characteristics can be dynamically adjusted according to the motion of the vehicle and road conditions and so on. Because of fast response, good robustness, low energy consumption and easy to control, the magnetorheological damper can provide good semi-active vibration control ability, and becomes the focus of the present study. In order to adapt to the demand for higher performance of magnetorheological damper, people pay more and more attention to the design of magnetorheological damper.This article is based on the existing magnetorheological dampers’ characteristics at home and abroad and the structure problems, such as the damping force of the adjusting range is not enough and inconvenient assembly, putting forward a new type of pump magnetorheological damper, which has a simple structure, coil replaceable, good heat dissipation, high reliability, large adjustable ratio, etc. So this damper can effectively improve vehicle’s performance.This paper makes the following several parts of the job:1. Optimization and design of the magnetic field supply systemUsing FEMM and Matlab joint simulation method. Sensitivity analysis is carried out on the related parameters. A semi-empirical model of magnetic field intensity is set up. The agreement of the model results with the simulation results shows that this model is reasonable and feasible.2. Establishment of pump magnetorheological damper mechanical modelSetting up a parallel plate movement differential equation; a magnetorheological damper damping force formula is set up based on Bingham fluid model and the shock absorber structure, which helps designing and manufacturing shock absorber samples.3. Design of pump magnetorheological damper sampleA sample of the pump magnetorheological damper is designed and made; The shock absorber dynamometer tests have been carried out, which verifies the validity and practicability of the model.4. Control of the semi-active suspensionA 1/4 vehicle vibration model is established; The semi-active suspension is controlled by skyhook-add control algorithm; The sample is installed to the target vehicle and has bench tests and the test results show that the damper can well improve the comfort of the vehicle.