Study On Magnetorheological Transmission Technology And Devices

Intellectual material and devices is an important field in researching hightechnology and functional material.Magnetorheological Fluid (MRF) is an intellectualmaterial with unique magnetorheological effect, good rheological characteristics. Thedevices based on MRF have a promising application prospect, and the MRFtechnology is considered as a potential and new class intellectual material in the fieldof materials science. In the last decade, the MRF technology is favored by USA, Japan,British and Germany, and is invested large quantity financial and human resources.Based preparation, rheological mechanics and some engineering applications of MRF,the paper brings MRF technology into the field of transmission engineering, andstudies systematically the MRF transmission technology and control techniqueincluding magnetorheological effect, transmission mechanic of MRF, the theory,structure, and design principle of Magnetorheological Fluids TransmissionDevices(MRTD), finally, the characteristic and the regulating speed theory of theMRTD are studied experimentally by the specimen. All above mentioned aims atincubating new type MRF transmission technology, commercialization of the MRF anddeveloping of MR devices. The dissertation is divided into six chapters: 1. The present state and trend of development of MRF and devices technology areproposed at first. On the basis of analyzing and rheological model, the prospective andsignificance of this study is exposited. Finally, the goals and contents of thisdissertation have been put forward briefly. 2. Based discussing magnetorheological effect, ingredient and preparation of MRF,and analysis influencing factors of characteristic of MRF, distributing experiments invarious magnetic densities are done by optical Analytical ferrograph. 3. Referencing the working mode of MRF, the design rule and theory of a doubleshell MRTD adopted shearing mode are proposed. The theoretical torque calculationequation is deduced by Bingham model. Various working clearance magnetic densitiesare emulated with the FEA method, and accurate numerical solutions are achieved. Inresponse to those solutions, computing goal torques of emulated structures of MRTD,settling puzzles relation to magnetic circuit, processing of product structure, seal ofMRF and elimination of heat, etc. Mention above laid a foundation for developing andanalysis of MRTD. Finally, a serial of MRTD are designed and fabricated. V重庆大学博士学位论文 4. To analyzed the characteristic and transmission parameters of MRTD, Such asthe performance of torque Vs exciting current, slip power, temperature rise anddynamic response, and so on, are test by a modified experimental bench from classicalmagnetic transmission bench and the experimental results are researched. 5. According to the theory of electromechanical transmission, methods of speedregulation with MRTD are studied. Varied regulation methods and scopes ofapplication are introduced against various working machines, a speed regulationsystem is proposed with single MRTD. Speed regulating experiment of MRTD iscontrast with Magnetic Particle Transmission Apparatus (MTA), and a powerconservation experiment for Industrial fan is done. Finally, various energy savingregulating methods including hydrodynamic coupling, MRTD and frequency controlare compared theoretically. A controllable constant-current source for MRTD is studiedprimarily. 6. Some conclusions and prospects are given in sixth chapter. The maininnovative achievements of the dissertation are summed up.