Research On Multi-field Coupling Damping Characteristics Of Magnetorheological Damper With Inner Channel

With the development of artificial intelligence technology,people are demanding more and more comprehensive performance of automobiles,especially the control stability and ride comfort.The serni-active suspension with magnetorheological damper has the advantages of simple structure,wide continuously adjustable damping force,fast response speed and low energy consumption,high reliability as well as control stability and ride comfort,which become the best solution for suspension technology quickly.However,in the actual operation of MRD,there are multiple coupling effects between physical fields,which increases the difficulty of control,especially the influence of temperature field on the continuous adjustable damping force.Based on the requirements of the vibration absorption parameters of the GM8 suspension,a new type of magnetorheological damper with the inner channel is improved,and its damping characteristics under the coupling of multiple physical fields are studied.In order to promote the application and development of magnetorheological shock absorber in semi-active vibration absorption technology,some simulation and experimental data are provided for the structure optimization and practical application of MR shock absorber.The main tasks are as follows:1.Firstly,the structure design of the magnetic circuit inside the electromagnetic piston is analyzed and calculated,and the damping force of the magnetorheological damper is increased by increasing the magnetoresistance,and the range of damping adjustment is widened.According to the fluidity of the magnetorheological fluid in the damping channel,the mathematical model of the magnetorheological damper is derived.2.According to the structure parameters of magnetorheological shock absorber,the multi-physical field coupling simulation software ADINA is used for modeling,and the fluid-solid coupling simulation analysis of the magnetorheological damper is carried out.The power characteristic curve and damping force-velocity characteristic curve of the damper under different current are obtained.3.On the basis of the above work,the thermal effect model of magnetorheological shock absorber is established,and the fluid-solid-thermal three physical field coupling simulation analysis is carried out by using ADINA.The external characteristic curve and the dynamic distribution of the temperature field in the cylinder are obtained under the fluid-solid-heat coupling of the magnetorheological shock absorber of the inner flow channel of the piston.4.Finally,on the vibration test platform,the magnetorheological damper of piston inner channel is tested on the bench,and the power curve obtained by the test is approximately the same as that obtained by simulation.By comparing with the power curve of magnetorheological absorber under fluid-solid coupling without thermal coupling,it can be found that the damping force decreases obviously with the addition of thermal coupling at the same current,and the damping force decreases more obviously with the increase of current.Therefore,the effect of self-heating on damping performance should be fully considered in the design and practical use of magnetorheological shock absorbers.