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摘要:
针对水下机械手遥操作过程中数学模型及外部干扰引起不确定问题提出了自适应双边控制策略。对主机械手模型参数与外部干扰引起的不确定，设计了基于名义模型的参考自适应阻抗控制律，根据主手力与从手力误差来调节期望模型的参考位置，利用自适应控制律补偿模型不确定性。针对从机械手的不确定性采用径向基函数（RBF）神经网络进行自适应补偿，通过设计滑模变结构控制器与鲁棒自适应控制器消除逼近误差，满足了从机械手对主机械手位置跟踪。设计了李雅普诺夫函数证明跟踪性能与全局稳定性，保证力-位置跟踪的渐进收敛性能。结果表明：整体控制在模型不确定及外部干扰条件下具有很好的力-位置跟踪能力，整体系统具有稳定性和可靠性，并且具有鲁棒性及自适应控制能力。
Abstract:An adaptive bilateral control strategy is proposed for the uncertainty of the mathematical model and external disturbances during the teleoperation of underwater manipulator. A reference adaptive impedance control law based on the nominal model is designed for the uncertainty of the parameters of the master manipulator model and the external disturbance. The reference position of the expected model is adjusted by the deviation between the force of operator and the slave manipulator, and the model uncertainty is compensated by the adaptive control law. Aimed at the uncertainty of slave manipulator, the adaptive compensation is achieved by the radial basis function (RBF) neural network, and the approximation deviation is eliminated by the design of the sliding mode variable structure controller and the robust adaptive controller, which satisfies the position tracking of the slave manipulator to the master manipulator. The tracking performance and global stability are proved by Lyapunov function, and the asymptotic convergence of force-position tracking is guaranteed. The results show that the overall controller has good force-position tracking ability under the conditions of model uncertainty and external disturbance. The whole system is stable and feasible, and has robustness and adaptive control ability.
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Key words:
- teleoperation /
- impedance control /
- neural sliding mode control /
- force-position tracking /
- robustness /
- adapation
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图 2 主手模型参考自适应阻抗控制结构
Figure 2. Structure of master manipulator model reference adaptive impedance control
图 5 遥操作参考位置、主手、从手位置跟踪曲线
Figure 5. Tracking curves of reference position and position of master and slave manipulator in teleoperation
图 6 遥操作主从手角度跟踪曲线
Figure 6. Angle tracking curves of master and slave manipulator in teleoperation
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