Research On Evolution And Space Environment Engineering Model Of Ejecta

Ejecta, also known as secondary debris,is one of the main source of space debris,produced by reverse ejecting after small debris’ hypervelocity impact to the spacecraft.Ejecta belongs to tiny debris which small than1mm, without enough energy topenetrate the surface of spacecraft. It can bring cumulative damage to the neighborhoodof the impact point of spacecraft components, degrading the spacecraft surface material,disturbing the photoelectric detecting signal, causing arc discharge and disturbingcommunication, etc. In the early1990s, foreign researchers began to study ejectingprocess, harm and environment engineering model of ejecta. In recent years, ourcountry also gradually carries out research of tiny pieces, but limited to the research ofthe harm to spacecraft. Research of ejecta orbital evolution and engineering modelingfalls behind. Aiming at this problem, this paper study ejecta orbital evolution, analyze ofejecta environment modeling method. This paper is theoretically and practicallyvaluable in perfecting the space debris environment engineering model and protectingthe space environment.This article mainly includes three parts:Firstly, as the basis of the full simulation analysis, a detailed study of ejecta sourcemodel is done. The applicable scope of the ejecta source model, physical significanceand relationship of parameters is analyzed. According to the characteristics of thecomplex space environment and space debris, disturb motion of debris is studied, orbitprediction model is confirmed.Secondly, the simulation is preceded, with orbital evolution rule analyzed. Ejectaevolution model is established, including the orbital elements of the target satellite,setting of ejecta characteristic parameter and simulation time. Ejecta cloud cluster underdifferent parameter conditions is calculated using MATLAB. Ejecta evolution data isobtained. By statistically analyzing the simulation results, revolution rule of ejecta cloudcluster and influence of initial parameters is summarized. Thirdly, ejecta modeling method is studied. Method of absorbing ejecta into spaceenvironment engineering model is analyzed combining space debris environmentengineering model research status based on the simulation above.