考虑导轨间隙的在轨分离动力学计算方法

赵刚练; 姜毅; 陈余军; 董晓彤

doi:10.6052/0459-1879-13-193

考虑导轨间隙的在轨分离动力学计算方法

doi: 10.6052/0459-1879-13-193

1.
北京理工大学宇航学院, 北京 100081
2. 中国空间技术研究院, 北京 100094

基金项目: 国家高技术研究发展计划资助项目(2012AA7042016).

详细信息

通讯作者:
赵刚练，博士，主要研究方向：发射动力学。E-mail：360185889@163.com

中图分类号: O313.7;V412.4
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- 被引次数: 0
出版历程
- 收稿日期: 2013-06-25
- 修回日期: 2013-08-05
- 刊出日期: 2013-11-18

COMPUTATIONAL METHOD FOR DYNAMICS SIMULATION OF PAYLOAD SEPARATION FROM SATELLITE WITH RAIL CLEARANCE

1.
School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
2. China Academy of Space Technology, Beijing 100094, China

Funds: The project was supported by the National High Technology Research and Development Program of China (2012AA7042016).

摘要

摘要: 传统在轨分离载荷动力学分析未考虑实际导轨的实时接触，无法准确分析分离时刻载荷的速度和角速度。针对半圆形双导轨，研究了空间导轨与定向器接触的特点及形式，基于分离装置的几何构型提出了一种确定发生相对轴向运动时导轨与定向器潜在接触对的方法，所提方法考虑了载荷轴线与导轨轴线的空间夹角，保证了分离后期接触检测的准确性，并可推广至多导轨接触计算。基于Lankarani与Nikravesh的连续接触力模型计算法向碰撞力，采用修正的Coulomb模型计算切向摩擦力。最后对飘浮基挠性航天器在轨分离载荷模型进行数值分析，验证了方法的有效性。结果表明导轨间隙增大了接触碰撞力，且随间隙的增大垂直于载荷分离方向的速度和角速度增大，导轨间隙使基座的转动与挠性附件强烈耦合，对航天器的稳定性造成影响。
- 挠性航天器 /
- 导轨间隙 /
- 接触 /
- 载荷分离 /
- 多体系统动力学
Abstract: Traditional researches on payload separation from spacecraft don't consider actual contacts in rail clearance, and separation velocity of payload can't be assessed accurately. According to two semicircle rails, characteristics of contacts between spatial rail and director were investigated. A method for detecting potential contact points between director and rail with relative movements was presented based on the structural features. Spatial angle between the director and the rail is calculated to detect contact exactly in the later stage of separation. The normal contact force was modeled using the continuous approach proposed by Lankarani and Nikravesh, and the tangent friction was calculated by a modified Coulomb's friction law. Validity of the methodology is proved through a free-floating flexible spacecraft model. And the results show that rail clearance causes high contact forces, and velocity vertical to the separation direction increases with clearance size. Further more, clearance aggravates the coupling between the appendages and the base, and effects spacecraft's stability.
- flexible spacecraft /
- rail clearance /
- contacts /
- payload separation /
- multibody dynamics

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