Self-induced Performance And Dynamic Characteristics Experiment Research Of Displacement Differential Self-induced Magnetorheological Damper

Magnetorheological fluid is a kind of semi-active intelligence material, its liquidmobility and shear yield strength changes with the strength of magnetic field and hascharacteristics such as fast response speed, low energy consumption, continuous reversible. Atpresent, the domestic and foreign researchers designed the corresponding MRD, MR valveand MR clutch on the working medium of MRF, the research and application of MRD wasmore widely. Research of traditional MRD focused on mechanical property analysis ofdamper, but when using MRD on semi-active control system, which needed the help of thedamper displacement or speed signal as control signal source. So it often acquired thedisplacement or speed signal by external sensors. Although it satisfied the requirement ofdamper control, it increased the complexity of the whole control system and reduced thesystem stability at the same time. This paper designed a kind of displacement differentialself-induced MRD by integrating innovation the structure of shear valve type MRD in termsof the differential displacement sensor principle. Its damper force was continuous adjustablewith impressed current and it still can obtain relative displacement signal at the same time,attained the controllable damping and displacement self-induced function integration.1. Put forward the structure model of DDSMRD, established the correspondingmechanical model, and analyzed relationship of the induced electromotive force anddisplacement in differential displacement sensing principle. Detailed described design andcalculation process of components in the DDSMRD structure, analyzed the magneticresistance calculation in the magnetic circuit on the basis of the structure parameters.2. Simulated and analyzed the DDSMRD static magnetic field by using ANSYS,obtained the curve of average magnetic induction intensity of damping effective length andcurrent under different electrical. By coupling field simulation, analyzed the harmonicmagnetic field of damper under different excitation amplitude and different points, and get thecorresponding induction electromotive force amplitude. By using mechanical model and thestatic magnetic field simulation data of damper, simulated and analyzed dynamiccharacteristics of damper through the Matlab/Simulink.3. Designed DDSMRD displacement signal collection and control interface by usingLabVIEW, and combining with related experimental equipments designed damperdisplacement signal acquisition system. Through the static tensile experiment of damper, thestatic induction performance of the damper was analyzed and the practicability of thedisplacement signal acquisition system was proved. 4. Designed excitation signal generating circuit of DDSMRD piston head, builtdamper experiment test system, and analyzed the self-induced characteristics and dynamiccharacteristic of damper by experiment.