Stress Analysis And Experimental Research On Passive Damping Technology Based On Magnetic Fluid

Magnetic fluid or ferrofluid is the only liquid magnetic material with commercial use,which both has the liquidity of liquid and magnetic properties of solid materials. Theinternal fluid pressure associated by the magnetic field. There is a theory that we callsecond order buoyancy principle, it means when the permanent magnet is immersed inmagnetic fluid, besides the function of the buoyancy that the magnetic fluid as the generalfluid produces, the permanent magnet is also affected by the magnetic pressure, themovement of the permanent magnet will prevented by the magnetic pressure. The flowresistance of the Magnetic fluid will dissipate the kinetic energy of the system.Based on the above principle, the magnetic fluid damper structure is simple,lightweight, does not require an external magnetic field or any incentive for spacecraftsome longer objects (such as a satellite antenna, etc.) local frequency damping in theaerospace has a good application prospect and research significance. By use the finiteelement method, this paper analyzes restoring force of the permanent magnet, and thefactors affecting the restoring force, also draw the curve of the restoring force, and find thebest size of the permanent magnets. In this paper we also analyzes the loss of the energyand the relationship between the size and the energy loss. In the end we draw the force ofthe shock absorber hysteretic curve, also the damping energy loss curve. Compared with theexperimental, analyzes the reasons for the error, obtained permanent magnet size anddamper performance relationship.