Dynamics and Control of Electrodynamic Tether Systems

电动系绳系统的动力学和控制

• 批准号: 341917-2013
• 负责人: Zhu, ZhengHong
• 金额: $ 2.33万
• 依托单位: York University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=572413
• 关键词: Dynamics; Control; Electrodynamic; Tether; Systems

Electrodynamic tethers (EDTs) are an innovative approach to generate propulsion for boost and deorbit maneuver and electricity onboard spacecraft without consuming propellant. Over the past five decades, 12 out of 26 orbital and suborbital tether missions flew with EDTs. However, the system is prone to the long-term instability caused by the time-varying excitation of Lorentz force. Thus, a thorough understanding of the long-term dynamic stability of an EDT system is essential for its useful application in space. In spite of great achievements in the EDT theory and electrodynamic tethered systems, a number of interesting challenges still exists in the fundamentals of coupled EDT dynamics and long-term dynamic stability. Therefore, the objectives of this discovery program are to systematically study the coupled electro-mechanical dynamics and optimal control of the long-term stability of EDT systems. In this new approach, we will formulate a multiphysics model of dynamics of a bare and flexible EDT coupled with electricity generation by orbit motion limited theory. Based on the new multiphysics model, the parameters of EDT systems will be optimized by applying multiobjective optimization procedure for (a) fastest time in boost or deorbit maneuver or (b) maximum energy generation for given payloads onboard spacecraft, while minimizing the EDT length and end masses. The long-term dynamic stability of an EDT system will be achieved by finding an optimal balance between a stable oscillation of a time-varying EDT system and given mission objectives using the nonlinear-programming optimization procedure and the robust finite receding horizon control theory. Finally, ground testing will be conducted to validate the dynamics and control strategy. The outcome of the proposed research program will be (i) a high-fidelity multiphysics EDT model essential for EDT systems, (ii) a robust optimal control algorithm, and (iii) training of 14 HQP in an interdisciplinary and collaborative environment. It will advance our knowledge in new propulsion or power generation for future space exploration and enhance the competitiveness of Canadian space industry.

电动系绳是一种创新的方法，可以在不消耗推进剂的情况下为航天器提供助推和离轨机动的推进力和电力。在过去50年中，26次轨道和亚轨道系绳飞行任务中有12次使用了EDT。但是，由于洛仑兹力的时变激励，系统容易发生长期不稳定。因此，深入了解EDT系统的长期动态稳定性对于其在空间中的有用应用至关重要。 尽管在EDT理论和电动系留系统的巨大成就，一些有趣的挑战仍然存在于耦合EDT动力学和长期的动态稳定性的基础。因此，这个发现计划的目标是系统地研究机电耦合动力学和EDT系统的长期稳定性的最优控制。在这种新的方法中，我们将制定一个多物理模型的动力学裸和灵活的EDT耦合发电的轨道运动有限理论。基于新的多物理场模型，采用多目标优化方法对EDT系统的参数进行优化，使EDT长度和末端质量最小化的同时，（a）在最短时间内完成助推或离轨机动，或（B）在给定有效载荷下产生最大能量。利用非线性规划优化方法和鲁棒有限滚动时域控制理论，在时变EDT系统的稳定振荡和给定的使命目标之间寻求最优平衡，实现EDT系统的长期动态稳定。最后，将进行地面试验，以验证动力学和控制策略。 拟议研究计划的成果将是（i）对EDT系统至关重要的高保真多物理场EDT模型，（ii）鲁棒的最优控制算法，以及（iii）在跨学科和协作环境中培训14名HQP。它将增进我们在未来空间探索的新推进或发电方面的知识，并提高加拿大空间工业的竞争力。