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面向在軌捕獲的空間機器人路徑規劃與控制綜述

A review on planning and control of space robots for on-orbit capture

  • 摘要: 隨著航天技術的快速發展,空間機器人逐漸被廣泛應用于空間碎片清除、故障航天器維修、失控衛星捕獲等在軌服務中. 在這類任務中,空間機器人的末端執行器需要跟蹤預設軌跡到達捕獲點,完成空間目標的捕獲以及后續操作. 然而,復雜的太空環境和空間機器人固有的動力學特性使路徑規劃和控制面臨諸多挑戰. 本文首先回顧了世界主要航天國家在空間機器人領域的研究現狀,介紹了空間機器人基于廣義雅可比矩陣(Generalized Jacobian matrix, GJM)的運動學模型和基于拉格朗日法的動力學模型,以說明空間機器人的動力學特性. 在此基礎上,結合在軌捕獲任務需求、復雜太空環境及動力學特性,歸納了空間機器人路徑規劃和控制領域的最新研究進展,展示了地面試驗技術及其在路徑規劃與控制驗證中的研究成果. 最后,總結了當前空間機器人技術中存在的問題,并展望了未來可能的研究方向.

     

    Abstract: With the rapid development of space technology, space robots are playing an important role in on-orbit services, such as refueling, debris removal, and malfunctioning satellite repair. These space robots typically consist of a base spacecraft and n degrees-of-freedom (n-DOF) manipulators. The manipulators could be equipped with different end-effectors to capture space objects and perform various operations. In the precapture phase, space robots are required to follow a preplanned trajectory to the designated capture points. However, the dynamic characteristics of space robots introduce challenges in path planning. First, dynamic singularity might occur when solving the inverse kinematics in task-space path planning. Unlike fixed-base manipulators, the motion of the base spacecraft could be influenced by the manipulator’s movements due to dynamic coupling. Thus, base disturbance minimization becomes a key consideration while planning the trajectory of the manipulator. In addition to dynamic factors, practical concerns such as obstacle avoidance as well as input and velocity constraints should be satisfied to ensure the success of the mission. Furthermore, for some complicated space missions involving dual-arm space robots, coordination between two arms should be considered. Once the desired trajectory is planned, a tracking control strategy is designed to drive the end-effector to the capture points. However, the high nonlinearity, multidimensionality, and strong coupling of the space robot system increase the difficulty of tracking control. During on-orbit capture, the relative motion between the space robot and the target limits the available operational time, requiring the end-effector to quickly reach the capture points along the desired trajectory. In addition, the controller design should guarantee both steady-state and transient performance, such as slight overshoot, small steady-state error and short transient time. Working in a complex space environment, space robots are inevitably subjected to unknown external disturbances and parametric uncertainties, which could negatively affect the control accuracy and require compensation. Consequently, the proposed control strategy should ensure overall system stability, fast convergence, and strong robustness against disturbances and uncertainties. Before deployment, comprehensive ground-based verifications are important to evaluate the performance of the system. The effectiveness of ground-based verifications in accurately reflecting real space motions depends on the simulations of the space environment, particularly the microgravity environment. To address these technological challenges, this paper provides an overview of recent advancements in path planning and tracking control, with a focus on the inherent dynamic characteristics of space robots and the complexities of the space environment. The application of intelligent methods in multiobjective optimization and disturbance rejection control is also introduced in light of the rapid development of artificial intelligence. Additionally, relevant ground-based verification technologies are discussed. Finally, this paper presents the existing limitations and potential future developments in the field of space robots.

     

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