The Research On Theory And Experiment Of Magnetic Fluid Damper

In the field of aerospace, the impact of the external environment and the operation of various equipment will produce various kinds of vibration. These vibrations will cause the dynamic response of the spacecraft structure and system, and influence the normal operation of the instruments and equipment. In this paper, two new type magnetic fluid dampers based on the second-order buoyancy rule of magnetic fluid and the viscous energy dissipation rule of the magnetic fluid are proposed to solve the vibration problem of the long and straight objects on the spacecraft. In this paper, the theoretical vibration model of the magnetic fluid damper is analyzed, and the structural factors affecting the magnetic fluid damper are studied.The key work of this paper is as follows:1. The theoretical basis of the magnetic fluid damper is analyzed. The hydrodynamic characteristics of the magnetic fluid, the second-order buoyancy rule of the permanent magnet in the magnetic fluid, the viscosity of the magnetic fluid and the factors affecting the viscosity of the magnetic fluid are studied;2. Through the mechanism research, two new type magnetic fluid dampers are proposed:housing-filled magnetic fluid damper damper and magnetic fluid damper damper with magnetic restoring force. The structure of two kinds of magnetic fluid dampers are designed, the materials of the structure, the permanent magnet, magnetic fluid are chosen;3. The experimental platform of magnetic fluid damper and the platform of measuring force are established;4. The vibration model of magnetic fluid damper is analyzed, and the key parameters of the vibration differential equation:the equivalent damping coefficient and the restoring force of the permanent magnet of the magnetic fluid damper are studied;5. Experiments are made to study the effects of shell’s inner diameter, shell length and oscillation amplitude on the damping effect of the housing-filled magnetic fluid; the effect of shell’s inner diameter, shell length, the magnetic fluid absorption and oscillation amplitude on the damping effect of magnetic fluid damper with magnetic restoring force.