Spacecraft will be affected by vibration in the process of operation.On the one hand,vibration will affect the stability of spacecraft operation,even lead to space accidents.On the other hand,the existence of vibration makes the spacecraft in microgravity environment,which leads to inaccurate results of space experiments.As a new kind of material,magnetic liquid has both magnetism and fluidity.Therefore,the damper developed with magnetic fluid has the advantages of simple structure,long service life and high sensitivity.And it can effectively suppress the low frequency and small amplitude vibration of spacecraft in space.In this paper,a new type of magnetic liquid damper was designed and studied.The main contents of this thesis include:(1)This paper classified the vibration of spacecraft in space and explained the necessity of vibration reduction research.The advantages of magnetic liquid damper applied in space environment were obtained by comparing the existing damping forms.Based on the comprehensive analysis of the research status of the damping method,the research status of the suspension characteristics of the magnetic fluid and the research status of the magnetic fluid damper,the development trend of the magnetic fluid damper was obtained.(2)The Bernoulli equation of magnetic fluid was derived according to the basic law of ordinary fluid mechanics,and the magnetization process of magnetic fluid and the basic principle of second-order suspension characteristics were studied.The magnetic field of the cylindrical permanent magnet was calculated and the influence of the axial diameter ratio of the cylindrical permanent magnet on its magnetic field distribution was studied.The suspension characteristics of permanent magnet under different filling modes of magnetic liquid were discussed.(3)The new damper shell was designed and optimized.By comparing the material properties,the material of the damper shell was selected and the type of magnetic fluid used was finally determined.The inertial mass was designed.The energy consumption formula of damper was derived.(4)Based on the study of the ability of the permanent magnet to adsorb the magnetic liquid,the diameter range of the inertia mass was preliminarily determined.The rheometer was used to study the influence of the diameter on the performance of the damper and determine the final diameter of the inertia mass.Through the simulation of ANSYS and COMSOL,the effects of magnetic and non-magnetic materials as connecting masses on the performance of damper were compared.(5)Optimized the structure of the damper inertia mass.On this basis,the performance change of the damper with different amount of magnetic liquid was studied.65 figures,3 tables,50 references. |