论文标题

带有球形软机器人手臂的快速可靠的选择应用程序

A Fast and Reliable Pick-and-Place Application with a Spherical Soft Robotic Arm

论文作者

Zughaibi, Jasan, Hofer, Matthias, D'Andrea, Raffaello

论文摘要

本文介绍了学习控制方法的应用,以通过球形软机器人臂实现快速可靠的选择应用。该手臂的特征是轻巧的设计,并且由于部署的软材料而符合符合性的行为。采用了柔软的连续关节,可以同时控制一个接头中一个平移和两个旋转自由度。这使我们能够在接地应用过程中轴向接近并在附加的吸入杯中挑选一个物体。引入了基于压力差和拮抗执行器配置的控制分配,从而使系统动力学解耦并简化建模和控制。确定了线性参数变化模型,该模型通过附着的载荷质量和与关节刚度有关的参数进行了参数。提出了增益制定的反馈控制器,该反馈控制器渐近地稳定机器人系统,以进行积极的调整和所考虑的参数的大变化。使用迭代学习控制方案增强了控制体系结构,以在0.3秒内(无质量)至0.6秒(附带的负载质量),可以准确跟踪涉及60度(无质量)内的固定点转换的攻击性轨迹。提出的建模和控制方法可以可靠地实现采摘应用程序,并在实验上证明。

This paper presents the application of a learning control approach for the realization of a fast and reliable pick-and-place application with a spherical soft robotic arm. The arm is characterized by a lightweight design and exhibits compliant behavior due to the soft materials deployed. A soft, continuum joint is employed, which allows for simultaneous control of one translational and two rotational degrees of freedom in a single joint. This allows us to axially approach and pick an object with the attached suction cup during the pick-and-place application. A control allocation based on pressure differences and the antagonistic actuator configuration is introduced, allowing decoupling of the system dynamics and simplifying the modeling and control. A linear parameter-varying model is identified, which is parametrized by the attached load mass and a parameter related to the joint stiffness. A gain-scheduled feedback controller is proposed, which asymptotically stabilizes the robotic system for aggressive tuning and over large variations of the parameters considered. The control architecture is augmented with an iterative learning control scheme enabling accurate tracking of aggressive trajectories involving set point transitions of 60 degrees within 0.3 seconds (no mass attached) to 0.6 seconds (load mass attached). The modeling and control approach proposed results in a reliable realization of a pick-and-place application and is experimentally demonstrated.

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