A comparative assessment of gravitational field modeling methods for binary asteroid landing  

作　　者：Tongge Wen Xiangyuan Zeng Ziwen Li Yang Yu 

机构地区：[1]School of Automation,Beijing Institute of Technology,Beijing,100081,China [2]School of Aeronautic Science and Engineering,Beihang University,Beijing,100191,China

出　　处：《Astrodynamics》2024年第3期417-435,共19页航天动力学（英文）

基　　金：supported by the National Natural Science Foundation of China(Nos.12222202 and 11972075).

摘　　要：The tradeoff between accuracy and efficiency in gravitational field modeling for binary asteroid landing is one of the challenges in dynamical analyses.Four representative gravitational modeling methods are employed and compared in this study.These are the sphere-sphere model,ellipsoid-sphere model,inertia integral-polyhedron method,and finite element method.This study considers the differences between these four models,particularly their effects on the landing dynamics of a lander.A framework to simulate the coupled orbit-attitude motion of a lander in a binary system is first established.Numerical simulations are then performed on the natural landings on the second primary of the(66391)Moshup-Squannit system.The results show significant differences in the final landing dispersions,settling time,and sliding distance when applying the simplified models.On the basis of the modeling accuracy and computational efficiency,the finite element method should be chosen for future missions.

关 键 词：landing dynamics contact dynamics gravitational field modeling binary asteroid 

分 类 号：P18[天文地球—天文学]