Analysis And Experimental Research On Temperature Field Of Magnetorheological Fluid Dynamometer

Magnetorheological fluid(MRF)is a kind of intelligent material whose rheological property changes with magnetic field changing,and the change is continuous,reversible,be controlled easily.It shows a Newton fluid characteristic about fine flowability and low viscosity without magnetic field,but its apparent viscosity shows a Bingham fluid characteristic about low flowability and high viscosity in milliseconds when a magnetic field was applied.The high yield stress,low viscosity,fast response characteristics of MRF make it widely used in transmission,vibration,polishing,sealing etc..At present,many domestic and foreign scholars are committed to the research of magnetorheological fluid and magnetorheological transmission device.There is a close relationship between the working stability of the magnetorheological transmission device and the temperature.The stability of the magnetorheological transmission device depends on the characteristics of the magnetorheological fluid.Temperature is an important factor affecting the characteristics of magnetorheological fluid.If it is too high,the apparent viscosity and stability of the magnetorheological fluid is reduced,and it affects the normal operation of the transmission device.So,the temperature field research of magnetorheological fluid dynamometer plays a very important role.According to the development of the magnetorheological fluid and its research status,the main performance parameters of magnetorheological fluid and the influencing factors of the parameters are analyzed and studied.With reference to the research of magnetorheological transmissions at home and abroad,firstly,the test bench of magnetorheological fluid dynamometer is set up.Then the temperature field test is carriedout and the experimental data are analyzed and processed by Excel and MATLAB.The performance parameters of magnetorheological fluid dynamometer and the relationship between the temperature and the speed of the test point are obtained,which provide the basis for the follow-up experiment and research.Secondly,the dynamometer model is simplified,the 3D model of magnetorheological fluid dynamometer is created by CATIA software,and the mesh module of ANSYS is imported to get the finite element model of dynamometer.The finite element model was introduced into FLUENT to calculate and post-process the temperature field of the dynamometer.The temperature field and temperature of the test point under different working conditions were obtained.The test value and the simulation value of the test point were obtained by MATLAB software.The maximum relative error is 7.8%,which verifies the correctness of the temperature field model of magnetorheological fluid dynamometer.Finally,a new structure model is established by using the validated temperature field model of the magnetorheological fluid dynamometer,and the optimization of the magnetorheological fluid dynamometer is realized through the software analysis.