Study On Magnetorheological Fluids Preparation And Power Transmission Technology

Magnetorheologcial Fluids (MRF), which is composed of soft magnetic particlessuspended in carrier fluid and stabilizer, is a new type intelligent material with attractiverheological properties upon the application of an external magnetic field, and has awidespread use in the occasions of damping control and power transmission,Magnetorheological Transmission Device (MRTD), with superior transmissionperformance and application prospect, is an important application of MRF. According to theexisting problems, the following aspects are thoroughly researched in the dissertation.According to the special requirements of transmission MRF, of which each componentis chosen and the performance is analyzed. A variety of MRF is prepared by the method ofcarrier fluid displacement. The influence rule of surfactant type and content on MRFsedimentation stability and apparent viscosity is researched, and the effect of singlesurfactant is obtained.According to the application effect of single surfactant, the surfactant compoundtechnology is put forward, and the influence rule of compound sequence, process andcontent on compound effect is studied, the more excellent preparation process andcompound content relation is obtained, and then, the transmission MRF is prepared by themethod obtained above, the various components of the thermal properties, particle thermalmagnetic properties, thermal oxidation characteristics, MRF and silicone oil thermalexpansion characteristics, sedimental stability of MRF processed by high temperature areall studied.The method of testing yield stress of MRF is summarized, and the problems existingin the process of testing yield stress are pointed out. A disk type yield stress measurementinstrument with temperature control function is designed, and the simulation andexperimental analysis on the magnetic circuit of the instrument is performed. What’s more,the wall characteristic of MRF is tested in the instument by the method of yield stressmearsurement for different transmission disks with different groove number, groove widthand groove density. On the basis of research results of wall characteristics, the moreexcellent transmission wall is adopted to test the shear yield stress of MRF in normal andhigher temperature.A multiplate MRTD with water flowing channel is designed, of which the magneticcircuit and temperature field are analyzed by the FEM software. And then, the multiplatemagnetorheological transmission experimental set-up is established, the related studies on the transmission characteristic, dynamic response performance, temperature risecharacteristic and heat dissipation of MRTD are developed. The research results play aguiding role in the thorough research on MRF and MRTD technology, and providetechnical support for the design of MRTD and application and popularization of MRTDtechnology.