太阳帆扰动扭矩估计与预测动量管理
Solar Cruiser Disturbance Torque Estimation and Predictive Momentum Management
AI总结：
本文提出了一种结合扰动扭矩估计的模型预测控制（MPC）框架，用于NASA太阳帆任务的动量管理。研究重点在于利用主动质量转换器（AMT）和反射率控制装置（RCDs）作为动量管理执行器，通过卡尔曼滤波实时估计未建模的扰动扭矩，提升动量管理的可靠性和性能。
摘要：
本文提出了一种结合扰动扭矩估计的模型预测控制（MPC）框架，用于NASA太阳帆任务的动量管理。太阳帆代表了大尺寸太阳帆技术的重要进展，其中包括主动质量转换器（AMT）和反射率控制装置（RCDs）作为动量管理执行器的创新应用。这些执行器的耦合特性在开发鲁棒的动量管理控制器方面带来了挑战。尽管最近的文献已经探索了MPC在太阳帆动量管理中的应用并取得了有希望的结果，但需要精确了解作用在太阳帆上的扰动扭矩。本文通过使用卡尔曼滤波来提供实时估计未建模的扰动扭矩，解决了这一问题。此外，本文中使用的动力学模型相比先前的工作具有关键的保真度增强，包括太阳帆的四反应轮组装以及其中质心与压力中心之间的偏移。此外，还进行了更现实的操作场景，包括在受姿态影响的太阳辐射力和扭矩下跟踪大角度 slew 操纵，以进一步验证所提出的方法相对于先前工作的有效性。仿真结果表明，所提出的策略在超出当前最先进方法操作范围的 slew 操纵中成功管理角动量增长。扰动扭矩估计的纳入被证明显著提高了所提出MPC方法的可靠性和性能。这项工作为太阳帆的动量管理能力设定了新的基准，并为利用AMT和/或RCDs的其他太阳帆的基于MPC的动量管理铺平了道路。
英文摘要：
This paper presents a novel disturbance-torque-estimation-augmented model predictive control (MPC) framework to perform momentum management on NASA's Solar Cruiser solar sail mission. Solar Cruiser represents a critical step in the advancement of large-scale solar sail technology and includes the innovative use of an active mass translator (AMT) and reflectivity control devices (RCDs) as momentum management actuators. The coupled nature of these actuators has proven challenging in the development of a robust momentum management controller. Recent literature has explored the use of MPC for solar sail momentum management with promising results, although exact knowledge of the disturbance torques acting on the solar sail was required. This paper amends this issue through the use of a Kalman filter to provide real-time estimation of unmodeled disturbance torques. Furthermore, the dynamics model used in this paper incorporates key fidelity enhancements compared to prior work, including Solar Cruiser's four-reaction-wheel assembly and the offset between its center of mass and center of pressure. More realistic operation scenarios involving the tracking of large angle slew maneuvers under attitude-dependent solar radiation force and torque are also performed to further validate the proposed method compared to prior work. Simulation results demonstrate that the proposed policy successfully manages angular momentum growth under slew maneuvers that exceed the operational envelope of the current state-of-the-art method. The inclusion of the disturbance torque estimate is shown to greatly improve the reliability and performance of the proposed MPC approach. This work establishes a new benchmark for Solar Cruiser's momentum management capabilities and paves the way for MPC-based momentum management of other solar sails making use of an AMT and/or RCDs.
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