Study On The Performance Of Magnetic Fluid Second-Order Buoyancy Damping Shock Absorber

For aerospace vehicles with flexible attachment structures such as solar panels for satellites and robotic arms for space stations,they usually have the characteristics of low stiffness and low damping.Under the interference of weak external vibrations,it is easy to produce lowfrequency and small-amplitude vibrations.Since the space is in a vacuum environment,the object is less damped by air when it swings,so it is difficult to eliminate vibration through its own swing,which greatly affects the stability of the spacecraft and the space station.Magnetic fluid is a new type of nano-superparamagnetic material,and its first-order buoyancy principle and second-order buoyancy principle play an important role in the field of vibration control.The magnetic fluid damping shock absorber has the characteristics of high sensitivity to vibration,small size,light weight,stable operation,no external excitation,etc.,and can be well used in the aerospace field with harsh environment and sensitive to energy consumption to solve the problems of low-frequency and small-amplitude vibration of its large-scale flexible attachment.Based on the second-order buoyancy principle of magnetic fluid,this paper uses a combination of theory,simulation,and experiment to study a new type of magnetic fluid damping shock absorber.The main work is as follows:(1)The development and application of magnetic fluid in the field of vibration reduction are reviewed.According to the development history of the magnetic fluid shock absorber,the shock absorber,vibration isolator,damper,etc.are analyzed and researched,and the magnetic fluid and the corresponding second-order buoyancy principle are briefly introduced.(2)The basic theory of the magnetic fluid second-order buoyancy damping shock absorber is studied.The motion equation,Bernoulli equation and second-order buoyancy principle of magnetic liquid are introduced,and the force equation between permanent magnets is deduced.(3)The design and simulation analysis of the magnetic fluid second-order buoyancy damping shock absorber are carried out.Based on the principle of second-order buoyancy,a new type of magnetic fluid damping shock absorber was proposed,and important parts were designed.The finite element method was used to simulate the magnetic field of the magnetic fluid damping shock absorber and the force between permanent magnets.(4)The experiment researches on the magnetic liquid second-order buoyancy damping shock absorber.The influence of the amount of magnetic fluid added on the performance of the magnetic fluid damping shock absorber,the influence of different connecting rod lengths on the performance of the magnetic fluid damping shock absorber,and the influence of different shell inner diameters on the performance of the magnetic fluid damping shock absorber are studied.