Research On The Mechanical Characteristic Of Maganetorheological Fluid Damper In The Multi-physical Field

Engineering mechanics is subject to study the rule of material macroscopic motion, the main research work including particle and geostatic, solid mechanics, fluid mechanics, rheologic mechanics, soil mechanics and rock mass mechanics etc. The solid mechanics is including material mechanics, structural mechanics, elastic mechanics, plastic mechanics, complex material mechanics and fracture mechanics, e.g. The research of this thesis is belong to complex material mechanics.Magnetorheological fluid (MR) damper is an excellent semi active control device, which has large output force, long adjustable range, wide temperature adaptability, fast response speed and low power consumption, etc. With little power input, the MR damper can regulate and generate large damping force, which overcomes the disadvantages of active control device, e.g., high cost, high power consumption and complexity of structure. The MR damper is now in application for vibration and shock resistance of structure progressively.The mechanical characteristics of MR damper in multi-physical fields, e.g., electromagnetic field and flow field etc., are researched in this thesis. After the analysis of variation of magnetic density of MR fluid gap of damper under different current strength is analyzed by the commercial software, the two-dimensional FEM model of MR damper is built. The relationship between current density and magnetic induction intensity in the damping passage is obtained. The comparison between the experimental data and the simulation results indicates the availability and effectiveness of this FEM method.Damper gap is analyzed using flow FEM model by non-Newtonian fluid Herschel-Bulkley model when the stress force from electromagnetic simulation on MR damper gap in flow field. With this method the coupling of multi-physical fields is analyzed. With the analysis of Tider_MR₆ MR Damper, the simulation model of MR damper is built based on Matlab/Smilulink, which can predict the damper characteristics of MR damper quantitatively, including the curves of force with velocity and force with displacement. According to the comparison with the experimental data, the numerical data are in good agreement, approving the effectiveness of this method.