Optimal Design And Dynamic Performance Research Of Mr Damper Based On Multi-field Coupling Model

Magnetorheological damper(MR damper)is an excellent semi-active actuator with the advantages of fast response,large output damping force and continuous control.It is widely used in the field of transportation and other vibration reduction.In order to improve the comfort and running quality of automobile,a kind of MR damper with double output rod shear valve is designed in this paper.At the same time,in order to more accurately explore the overall performance of MR damper,the multi physical field coupling simulation analysis of the designed damper is carried out.In order to improve the dynamic performance of MR damper as much as possible under the condition of constant volume,a multi-objective optimization design method based on DOE and proxy model is proposed on the basis of coupled simulation model,and the optimal size parameter combination is found.In order to test the working performance of the designed damper before and after optimization,a dynamic performance test system is built and its experimental analysis is carried out.The main contents of this paper are as follows:1.According to the overall dimensions of a Dongfeng Nissan automobile shock absorber,a shear valve type MR damper with double rod suitable for automobile suspension is designed.Considering several design points,the material selection of each part of the damper,the structural form of the damping channel and the selection of MR fluid are discussed,and the key structural parameters,magnetic circuit analysis and calculation and mechanical model derivation are established.2.According to the designed structural parameters,the multi field coupling simulation model of MR damper is established in COMSOL software,and the coupling analysis of electromagnetic field,flow field and solid mechanics is carried out.The static magnetic field characteristics of the damper under different excitation current,the dynamic flow field characteristics of the damper under different working conditions,the stress distribution of the damper under different excitation current and the dynamic performance under different vibration excitation are obtained by simulation.The feasibility of the structural design is preliminarily verified by the simulation results.3.Based on ISIGHT and COMSOL co-simulation,a multi-objective optimization design method of MR damper based on DOE and proxy model is proposed.Under the condition of keeping the volume unchanged,the optimal combination of size parameters is found through the analysis of experimental design,the construction of surrogate model and multi-objective optimization,and the performance of the optimized damper is simulated and compared with that before optimization,so as to preliminarily verify the effectiveness of the optimal design.4.The prototype of initial and optimal MR damper is manufactured respectively,and the dynamic performance test system is also built.By applying different excitation current and vibration excitation on the dampers,the influences of different working factors on the dynamic performance of the dampers are analyzed.According to the experimental results and the comparison between simulation and experiment,the feasibility of structural design,the accuracy of multi-field coupling simulation and the effectiveness of multi-objective optimization are further verified.