针对并联机器人振动问题,提出一种自适应迭代学习控制方法,提升轨迹跟踪精度。
Iterative Learning Control with Mismatch Compensation for Residual Vibration Suppression in Delta Robots

- 基于机电耦合模型设计可变频率输入整形器,补偿结构振动
- 引入模糊逻辑估计模型偏差,实现误差迭代收敛至零
- 适用于高精度高速并联机器人控制,如装配与分拣场景
由于并联机器人的能量优化设计导致非期望振动,影响精确轨迹跟踪。本文提出一种基于输入整形的自适应迭代学习控制器,考虑了电机-机械刚柔耦合动态特性,建立包含永磁同步电机的系统模型。针对机器人配置变化引起的固有频率变化,设计基于优化的输入整形器。所提迭代学习控制器融合模型失配补偿机制,采用模糊逻辑近似失配项,并利用障碍型复合能量函数证明其收敛性,确保沿迭代轴的跟踪误差趋于零。同时设计自适应参数更新律保障收敛性。最后通过Simscape进行高保真仿真,验证了该控制策略的有效性。
原文摘要 · Abstract (English)
Unwanted vibrations stemming from the energy-optimized design of Delta robots pose a challenge in their operation, especially with respect to precise reference tracking. To improve tracking accuracy, this paper proposes an adaptive mismatch-compensated iterative learning controller based on input shaping techniques. We establish a dynamic model considering the electromechanical rigid-flexible coupling of the Delta robot, which integrates the permanent magnet synchronous motor. Using this model, we design an optimization-based input shaper, considering the natural frequency of the robot, which varies with the configuration. We proposed an iterative learning controller for the delta robot to improve tracking accuracy. Our iterative learning controller incorporates model mismatch where the mismatch approximated by a fuzzy logic structure. The convergence property of the proposed controller is proved using a Barrier Composite Energy Function, providing a guarantee that the tracking errors along the iteration axis converge to zero. Moreover, adaptive parameter update laws are designed to ensure convergence. Finally, we perform a series of high-fidelity simulations of the Delta robot using Simscape to demonstrate the effectiveness of the proposed control strategy.
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