Research On Absorber Based On Magnetic Liquid Suspension Characteristics

In order to solve the problem of low frequency vibration of long straight flexible components in space undamped environment,a new type of magnetic fluid shock absorber is designed based on the suspension characteristics of magnetic fluid.Compared with the traditional shock absorber,the magnetic fluid shock absorber has the advantages of simple structure,sensitivity to inertial force,high reliability and zero power consumption.In this paper,the magnetic fluid shock absorber is studied from three aspects:theory,simulation and experiment.The main work is as follows:(1)The suspension principle of magnetic fluid shock absorber is introduced.The suspension force equation of magnetic fluid is deduced through the motion equation,Bernoulli equation and interface equilibrium equation of magnetic fluid.(2)The mechanical model of the vibration system of the magnetic fluid shock absorber is established,and the overall structure and components of the magnetic fluid shock absorber are designed.Through COMSOL simulation,the size of the magnetic sleeve was selected,and the magnetic fluid was selected.(3)The conditions of mass stable suspension in magnetic fluid shock absorber are analyzed theoretically,and the injection range of magnetic fluid when mass stable suspension is obtained through experiments.(4)Aiming at the specific structure of the magnetic fluid damper,the equations of the axial and radial suspension forces of the mass block under different parameters are derived,and the stiffness equation of the magnetic fluid damper is obtained.The influence of different copper block heights and different injections of magnetic fluid on the axial suspension force is obtained by setting up an experimental platform of the axial suspension force,and the suspension height of the mass block when it is suspended stably is obtained by analyzing the influence of different copper block heights and different injections of magnetic fluid on the axial suspension force.The stiffness of the magnetic fluid shock absorber was obtained by setting up a radial suspension force test bench to measure the influence of the amount of magnetic fluid injected and the height of copper block on the radial suspension force at a certain suspension height.The results show that the stiffness of the magnetic fluid shock absorber decreases with the decrease of the injection amount of magnetic fluid and the increase of the height of the copper block.(5)The effects of geometric parameters,initial amplitude and stationary time on the performance of vibration reduction are studied through vibration reduction experiments.Within the range of all the parameters selected in the experiment,when the copper block is 12 mm high and the injection quantity of magnetic fluid is 25 g,the vibration reduction effect is the best,the attenuation rate is 77.4%.