基于事件触发的采摘机械臂轨迹跟踪间歇控制

Event-Triggered Intermittent Trajectory Tracking Control for Picking Robotic manipulator

  • 摘要: 目前,机械臂广泛应用于农业采摘领域,成为农业自动化的关键组成部分。但是,采摘机械臂的连续控制策略对信息实时性要求极高,增加了控制成本,为此本文针对采摘机械臂提出了一种基于事件触发的采摘机械臂轨迹跟踪间歇控制策略。首先,利用拉格朗日力学,建立考虑外部扰动的双关节采摘机械臂的动力学模型。利用RBF神经网络估计采摘机械臂的未知动力学函数与外部干扰,基于反步法建立连续反馈轨迹跟踪自适应控制器设计方法。采用上下确界技术建立控制区与休息区的量化关系,进而提出控制区的事件触发控制器设计方案。利用李亚普诺夫稳定性理论,证明采摘机械臂系统收敛到一个有界区域,并实现预期跟踪目标。利用闭环信号的有界性原理,证明所设计的事件触发机制无Zeno行为。最后,分别考虑周期性间歇和非周期性间歇,分析本文采摘机械臂控制策略的可行性与有效性。

     

    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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