Research On Magnetorheological Damping Technology With Dual Annular Flow Channels For Vehicle Seats

As the ground vibration excitation,the vehicle seat suspension is transferred to the last link in the passenger path.The effectiveness of its performance is the key to reduce vibration and directly affects driving comfort.According to the current design status of magnetorheological shock absorber and the requirements and particularity of seat suspension shock absorber design,this paper proposes a double-annular flow magnetorheological shock absorber as an executive device of semi-active seat suspension system to improve the ride comfort of the car seat and attenuating the vibration intensity passed to the human body in the process of vehicle driving Through the principle analysis,theoretical calculation,parameter design and optimization,device test,system simulation analysis and test of the magnetorheological shock absorber,the effectiveness of the design of the double-annular inner bypass MR shock absorber and the better suppression effect of the MR seat suspension on vibration transmission are explored.The main work of this paper consists of the following aspects:(1)The principle analysis and theoretical calculation of the dual annular flow channel magnetorheological shock absorber have been established.The design principle of the ring structure analysis and its mechanical model was established.The design principle of the bypass hole structure has been analyzed and the calculation model has been deduced.Considering the design requirements of space size and output damping characteristics of passive shock absorber in practical application,the piston with double annular structure and inner bypass hole structure was applied to the design of magnetorheological shock absorber,and the theoretical design formula of damping force was derived.(2)The parametric design and optimization of the dual annular flow channel magnetorheological shock absorber are implemented.The design requirements of the passive shock absorber and the material properties of the actual magnetorheological fluid MRF-G28 are obtained through experiments.According to the actual processing conditions,combined with the boundary conditions of the structural design parameters and the optimization goals and design requirements,the processing plan is obtained.Considering other design factors such as assembly conditions and matching dimensions of standard parts,a more economical solution is selected for processing.(3)The prototype of the dual toroidal magnetorheological damper was tested.In order to analyze the performance of the shock absorber,the mechanical properties of the shock absorber under different working conditions are tested.The shock absorber is tested through the MTS device and data is collected for analysis to verify the correctness of the theoretical analysis and compare the design requirements to analyze the effectiveness of the design.The hyperbolic tangent model is established based on the test results of the magnetorheological shock absorber to provide preparation conditions for the subsequent simulation analysis of the semi-active seat suspension.(4)The magnetorheological semi-active seat suspension is simulated and tested.The dynamic model of the car seat suspension system was established to verify the damping effect of the dual annular flow channel magnetorheological shock absorber.The timedomain signal and fuzzy control strategy of the random road surface are introduced,and the dynamic simulation model is built by MATLAB/Simulink for simulation analysis to verify the effectiveness of the magnetorheological semi-active seat suspension.At the same time,the seat system test under fixed current was implemented to verify the controllability of the magnetorheological semi-active seat suspension under different currents.