Research On The Proximity Non-contact Detumbling Mechanism For Space Unmagnetized Metal Body

In aerospace activities,many tasks will involve the capture of non-cooperative targets,such as refueling satellites,assisting orbiting satellites that have not successfully entered a predetermined orbit,capturing and destroying abandoned satellites and space debris,and so on.The premise of implementing on-orbit capture is to first stop the rotation of the target,so safe and reliable detumbling technology is very critical.When the speed of space satellite debris rotation is too fast,the direct application of contact detumbling mechanism to capture debris will collide and may cause damage to the detumbling mechanism.Compared with the traditional mechanical contact detumbling technology,the non-contact detumbling technology has the characteristics of high reliability,no friction and wear,and easy control.It has wide application prospects in the aerospace field.Based on the particularity of the space environment and combined with the movement characteristics of the space metal body,this paper proposes a proximity non-contact detumbling mechanism,and explores its working principle,operating characteristics and comparative analysis of the structure,and combines the skin effect and eddy current loss,get the best parameters and structure of detumbling mechanism.First,this paper explores the working principle of the detumbling mechanism and chooses the basic structure of the electromagnetic coil.The method of finite element simulation and comparison determines the basic structure of the detumbling mechanism;The electromagnetic coil model derives the mathematical model of the excitation magnetic field and the eddy current torque,and combines with the skin effect to make the mathematical model of the eddy current torque accurate.The influence of the structural parameters of the detumbling mechanism was explored,mainly the influence of the radius of the electromagnetic coil,the number of ampere turns in the detumbling mechanism,the working distance between the detumbling mechanism and the target debris on the detumbling effect;the best parameters of the detumbling mechanism was determined by the analytical method,through the finite element simulation to parameterize the structural parameters to verify the conclusion;Finally,the article analyzes the effect of ambient temperature and target shape on the spin reduction effect.The purpose of enhancing the detumbling effect is achieved by adding iron cores of different shapes.First,a comparative analysis of various structures of the detumbling mechanism is carried out,the shape and size of the iron core in the detumbling mechanism are changed,and the size of the different iron cores is parameterized to obtain the shape of the core with the best detumbling effect;adopt the method of multi-coil joint detumbling to obtain the simulation results in the finite element software,and then obtain the effects of various excitation methods.Combined with the material properties of the target body,the influence of the skin effect was investigated.Firstly,the target body of the two material combinations is designed,and the influence of the skin effect is verified by finite element simulation;then the influence of different materials on the torque of the target body is analyzed,and the calculation software is analyzed and plotted to obtain the relationship between the material properties and the skin effect;finally,the calculation formula of the eddy current loss under the influence of the skin effect is derived,and the distribution of the eddy current loss of the target rotating body under the action of the detumbling mechanism is simulated.