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双星系统L1点悬停探测控制器设计与仿真
张永隆, 刘华缨, 曾祥远
北京理工大学 自动化学院, 北京 100081
摘要:
双小行星系统探测具有重要的科学意义,受其复杂动力学环境影响,探测任务极具挑战。利用球谐函数法对双星系统进行引力场建模,求解双星系统平动点,并选取其内部共线平动点L1点作为双星系统悬停探测目标位置。采用航天探测实际任务中常用的脉冲推力式发动机,设计了一种原理简单、便于工程实现的常值切换bang-bang控制器。以69230 Hermes双星系统为例,将Hermes近似为双椭球系统,仿真分析航天器在Hermes双星系统L1点悬停飞行的控制效果,验证所提控制策略有效性。
关键词:  双星系统;悬停探测;bang-bang控制;Hermes
DOI:10.15982/j.issn.2095-7777.2018.3.010
分类号:V448
基金项目:国家自然科学基金青年基金资助项目(11602019),中国科协青年人才托举工程资助项目(2016QNRC001),北京理工大学优秀青年教师资助计划资助项目(2015YG0605)
Controller Design and Simulation of Hovering Flight Around L1 in a Binary Asteroid System
ZHANG Yonglong, LIU Huaying, ZENG Xiangyuan
School of Automation, Beijing Institute of Technology, Beijing 100081, China
Abstract:
Binary asteroid explorations are of great scientific significance. It is extremely challenging for exploring binary asteroids because of the complex dynamical environments. Spherical harmonics method is adopted to represent the gravitational field of the binary asteroid. Five equilibrium points of binary asteroid system are obtained. The inner collinear equilibrium point L1 is selected as the target point of the hovering flight. By considering the characteristic of impulsive thrusters, a kind of bang-bang controller which is simple and easily implemented for engineering operation is designed. This paper takes 69230 Hermes as an example, models it with two ellipsoids. Hovering flight over the point L1 of the binary asteroid Hermes is numerically simulated to verify the effectiveness of the proposed method.
Key words:  binary asteroid system;hovering flight;bang-bang control;69230 Hermes