论文标题
固定时间积分滑动模式控制机器人操纵器的接收控制
Fixed-time Integral Sliding Mode Control for Admittance Control of a Robot Manipulator
论文作者
论文摘要
本文提出了一种新型的固定时间积分滑动模式控制器，以用于增强物理人类机器人协作。提出的方法结合了遵守入学控制的外部力量和对整体滑动模式控制（ISMC）不确定性的高度鲁棒性的好处，以便该系统可以在不确定的环境中与人类伴侣合作。首先，在ISMC中应用固定时间滑动表面，以使系统的跟踪误差在固定时间内收敛，而无论初始条件如何。然后，将固定的后台控制器（BSP）集成到ISMC中，作为标称控制器，以实现全局固定时间收敛。此外，为了克服奇异性问题，设计并集成到控制器中，这对于实际应用很有用。最后，提出的控制器将用于具有不确定性和外部力量的两连锁机器人操纵器的验证。结果表明，在跟踪误差和收敛时间的意义上，所提出的控制器在共享工作区中符合人类运动。
This paper proposes a novel fixed-time integral sliding mode controller for admittance control to enhance physical human-robot collaboration. The proposed method combines the benefits of compliance to external forces of admittance control and high robustness to uncertainties of integral sliding mode control (ISMC), such that the system can collaborate with a human partner in an uncertain environment effectively. Firstly, a fixed-time sliding surface is applied in the ISMC to make the tracking error of the system converge within a fixed-time regardless of the initial condition. Then, a fixed-time backstepping controller (BSP) is integrated into the ISMC as the nominal controller to realize global fixed-time convergence. Furthermore, to overcome the singularity problem, a non-singular fixed-time sliding surface is designed and integrated into the controller, which is useful for practical application. Finally, the proposed controller is validated for a two-link robot manipulator with uncertainties and external human forces. The results show that the proposed controller is superior in the sense of both tracking error and convergence time, and at the same time, can comply with human motion in a shared workspace.
