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基于事件觸發的采摘機械臂軌跡跟蹤間歇控制

Event-Triggered Intermittent Trajectory Tracking Control for Picking Robotic manipulator

  • 摘要: 目前,機械臂廣泛應用于農業采摘領域,成為農業自動化的關鍵組成部分。但是,采摘機械臂的連續控制策略對信息實時性要求極高,增加了控制成本,為此本文針對采摘機械臂提出了一種基于事件觸發的采摘機械臂軌跡跟蹤間歇控制策略。首先,利用拉格朗日力學,建立考慮外部擾動的雙關節采摘機械臂的動力學模型。利用RBF神經網絡估計采摘機械臂的未知動力學函數與外部干擾,基于反步法建立連續反饋軌跡跟蹤自適應控制器設計方法。采用上下確界技術建立控制區與休息區的量化關系,進而提出控制區的事件觸發控制器設計方案。利用李亞普諾夫穩定性理論,證明采摘機械臂系統收斂到一個有界區域,并實現預期跟蹤目標。利用閉環信號的有界性原理,證明所設計的事件觸發機制無Zeno行為。最后,分別考慮周期性間歇和非周期性間歇,分析本文采摘機械臂控制策略的可行性與有效性。

     

    Abstract: Currently, robotic manipulators are widely used in the field of agricultural harvesting, becoming a key component of agricultural automation. However, the continuous control strategy of picking robotic manipulators requires high real-time information, which increases control costs. To address this, this paper proposes an event-triggered intermittent control strategy for trajectory tracking of picking robotic manipulators. Firstly, a dynamic model of a two-joint picking robotic manipulators considering external disturbances is established using Lagrangian mechanics. An RBF neural network is used to estimate the unknown dynamic functions and external disturbances of the robotic arm. Based on the backstepping method, an adaptive control design for continuous feedback trajectory tracking is developed. Upper and lower bound techniques are used to establish a quantifiable relationship between the control and rest zones, leading to the design of an event-triggered controller for the control zone. Using Lyapunov stability theory, the stability of the picking robotic manipulators system is proven, ensuring the expected tracking performance. The boundedness of closed-loop signals in the picking robotic manipulators system is used to prove that the event-triggered mechanism avoids Zeno behavior. Finally, by considering both periodic and non-periodic intermittent cases, the feasibility and effectiveness of the proposed control strategy for picking robotic manipulators are analyzed.

     

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