Investigation On The Performance Of Magneto-rheological Fluid Damper

Magneto-rheological fluid (MRP) damper is a new-style semi-active damping controlled device, and its working medium is magnetor-rheological fluid. As a kind of new intelligent material, MRF is made up of micron magnetic particles, carrier liquid and additives. MRF damper can produce different damping force under different current excitation to deal with complex load condition outside world. MRF damper has the advantages of fast response speed, reversible reaction and low power consumption, and it will have a good application prospect.This paper carried out a research into the following several aspects:(1) By using viscoplastic model of Bingham fluid, this paper researched the effect of parameters on damping force, and then established a damping force calculation mode ofl MRP damper, then used numerical methods to study the relationship between damping force and the applied magnetic field, cutting gap. The investigation proveded a theoretical basis for MRF damper design.(2) This paper designed a new type of MRF damper and sealing structure. Effects of Magnetic circuit, piston and other parameters were analyzed; By using finite element analysis software, the simulation research was conducted on the internal magnetic field, and the relationship between internal magnetic field and impressed current was got to provide theoretical basis for the research of MRF damper’s performance.(3) By using lead screw transmission system, force sensor, stepper motor and data acquisition, a test platform was set up for the research of MRP damper performance.(4) This paper researched the effect of working gap on damping force by changing the size of damper piston, it also researched the effect of current on damping force by changing the current strength of excitation coil output. All of these would be used to provide experiment basis for further popularization and application.