Design and performance analysis of full fluid channel magnetorheological damper with built-in valve
Aiming at the problems of large volume and small output damping force of magnetorheological damper(MRD)in MR prosthesis,a full fluid channel MRD with built-in valve was designed.Firstly,the magnetic flux lines were guided through all fluid flow channels by arranging arranged with magnetically conductive wedge rings and a magnetically separating ring,and the magnetic circuit analysis and derivation of mathematical model of output damping force were carried out.Secondly,the electromagnetic field of the damper was simulated by ANSYS software.Thirdly,the structural parameters of the MRD were optimized by using the multi-objective genetic algorithm,and the average magnetic flux density and the output damping force of the damper before and after optimization were simulated and compared.Finally,the damper prototypes were machined before and after the optimization of structural parameters,and the dynamic performances were tested and analyzed.The results showed that the volume of the piston head was reduced by 24.4%and the maximum output damping force was increased by 24 N after optimization.When the current was 2 A,the simulated value of maximum output damping force before optimization was 295.38 N,and the experimental value was 309.76 N,with an error of 4.6%;the simulated value of maximum output damping force after optimization was 307.77 N,and the experimental value was 333.76 N,with an error of 7.6%.The designed full fluid channel MRD with built-in valve had smaller volume,larger output damping force and higher utilization rate of fluid flow channel space.The research results can provide reference for the design of MRD in MR prosthesis.
万方数据
维普
