Design, Simulation And Test Research Of Magneto-Rheological Damper

Magneto-rheological (MR) fluid generally consists of a base solution, dispersed part and activators, with a strong magnetic field the apparent viscosity increases over two orders of magnitude in a short time (milliseconds), and present solid features, while this change is continuous and reversible. MR fluid’s engineer applications were used in the construction structure, offshore platforms, bridges and high-speed vehicles, so specifically on its applications in the field of advanced vehicle suspension system were highly concerned by domestic and foreign researchers. In this thesis, the key issues of designing small shear valve type MR damper were studied, the main contents are as follows:1. Designed and produced a shear valve mode MR damper, conducted the magnetic field test and the basic performance test under high temperature conditions of the damper. The magnetic field test data corresponding to damping channel and the damping force-displacement curve were obtained.2. Discussed about shortcomings of traditional design methods and presented a new simple design method which comprising a correction coefficient and a 3-variables optimization model for optimal volume. The optimization results are analyzed by the finite element analysis of magnetic field. The variation curves that the magnetic field intensity follows current form optimized results were obtained. Studies have shown that the proposed practical design method can effectively guide design of the double rod type shear valve type MR damper.3. Comprehensively analyzed the study on flow field of MR damper, attempted using viscoelastic constitutive equation to simulate magneto-rheological fluid flow characteristics of the damping channel. Via fluid-thermal coupling analysis, the viscosity dissipate heat generated by the damper was calculated in the non-controlled state to obtain the transient temperature rise of the damper over time.