宇航学报 ›› 2017, Vol. 38 ›› Issue (1): 1-9.doi: 10.3873/j.issn.1000-1328.2017.01.001

• 飞行器设计与力学 • 上一篇    下一篇

柔性线缆连接的分离式卫星动力学建模

庞岩,李静,刘磊   

  1. 1. 大连理工大学航空航天学院,大连116024;2. 工业装备结构分析国家重点实验室,大连116024;
    3. 西北工业大学航天学院,西安710072
  • 收稿日期:2016-08-10 修回日期:2016-11-23 出版日期:2017-01-15 发布日期:2017-01-25
  • 基金资助:

    国家自然科学基金(11402044,51675430,11302132);可靠性与环境工程技术重点实验室开放基金(KHZS20143003);中央高校基本科研业务费(DUT16QY23)

Dynamics Modeling of the Separated Satellite with Flexible Cable

PANG Yan, LI Jing, LIU Lei   

  1. 1. School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024, China;
    2.State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian 116024 China;
    3. School of Astronautics, Northwestern Polytechnical University, Xi’an 710072, China
  • Received:2016-08-10 Revised:2016-11-23 Online:2017-01-15 Published:2017-01-25

摘要:

基于拉格朗日法建立柔性线缆连接的分离式磁耦合卫星刚柔耦合动力学模型,并基于该模型研究柔性线缆对分离式卫星隔振性能以及指向性能的影响。仿真结果表明,柔性线缆将明显降低分离式卫星对服务模块低频扰动的隔振性能,由于柔性线缆的存在,低频扰动将使载荷模块稳态时的姿态精度和稳定度大幅下降。柔性线缆也会影响载荷模块的指向控制精度,采用相同的PD控制器,有柔性线缆时载荷模块指向稳态误差大于无柔性线缆时载荷模块指向稳态误差4个数量级。柔性线缆对载荷模块性能影响明显,所建动力学模型对提高分离式卫星建模和控制精度有重要意义。

关键词: 分离式卫星, 柔性线缆, 拉格朗日法, 刚柔耦合动力学

Abstract:

The rigid-flexible coupling dynamics model of a separated satellite with flexible cable is derived using Lagrange method. Based on the proposed model, the flexible cable effect on the vibration isolation performance and pointing control of the satellite is investigated. The simulation result indicates that the flexible cable decreases the vibration isolation performance at low frequencies. Furthermore, the low frequency disturbances from the support module dramatically degrade the attitude accuracy and stability of the satellite. The flexible cable also has significant effect on the pointing control performance of the payload module. Using the same PD controller, the steady-state error of the payload module with flexible cable is 4 orders of magnitude larger than that of the payload module without flexible cable. It can be concluded that the performance of the payload module is seriously degraded by the flexible cable. The dynamics model in this paper is important on how to improve the modeling and control accuracy of the separated satellites.

Key words: Separated satellite, Flexible cable, Lagrange method, Rigid flexible coupling dynamics

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