arXiv:2606.26188cs.ROphysics.app-ph2026-06

为螺旋形软机械臂设计了自适应控制框架,实现精准稳定操作。

Morphology-Specific Closed-Loop Control of Logarithmic-Spiral Continuum Arms via Online Jacobian Error Compensation

  • 基于螺旋形态构建分段肌腱驱动模型,结合在线雅可比误差补偿。
  • 相比传统方法,轨迹跟踪误差降低,姿态漂移抑制,估计误差有界。
  • 适合高欠驱动软体机械臂的精准控制,适用于复杂抓取与协同任务。

对数螺旋在生物附肢中广泛存在,为具备抓握与缠绕能力的连续体机械臂提供了理想形态。近期报道的对数螺旋机器人实现了可扩展制造和多样化抓取,但缺乏逆运动学与闭环控制。本文首次提出针对对数螺旋连续体臂的形态特异性闭环任务空间控制框架。在MuJoCo中构建具有中心线主干和等边肌腱布局的分段肌腱驱动模型,以捕捉锥形柔性和接触动力学。从对数螺旋运动学直接推导出解析的任务空间雅可比矩阵,并结合布罗伊登拟牛顿更新与卡尔曼滤波估计实现在线雅可比误差补偿,持续修正非线性变形、接触及几何不匹配引起的建模误差。通过平面与空间仿真验证了该框架的性能,涵盖轨迹跟踪、姿态调节、扰动抑制、三维位置跟踪以及位置-姿态协同控制。与分段恒曲率(PCC)基线相比,所提方法始终降低跟踪误差,抑制姿态漂移,并保持雅可比估计误差有界。控制器进一步应用于形态赋能的操纵任务,包括障碍物辅助的抓取-缠绕-释放、全臂自适应抓取和多臂协同操作。结果表明,将对数螺旋形态与在线雅可比补偿相结合,可实现高欠驱动连续体机械臂的精确、鲁棒且可扩展控制。该框架为未来硬件实现与学习增强型软体机器人控制奠定了物理基础。

原文摘要 · Abstract (English)

Logarithmic spirals are ubiquitous in biological appendages and provide an attractive morphology for continuum manipulators capable of reaching, wrapping, and grasping. Recently reported logarithmic-spiral robots demonstrated scalable fabrication and versatile grasping but lacked inverse kinematics and closed-loop control. This work presents the first morphology-specific closed-loop task-space control framework for logarithmic-spiral continuum arms. A segmented tendon-driven model with a centerline backbone and equilateral tendon routing is developed in MuJoCo to capture tapered compliance and contact dynamics. An analytical task-space Jacobian is derived directly from the logarithmic-spiral kinematics and combined with online Jacobian error compensation using a Broyden secant update and Kalman-filter estimation. The resulting controller continuously corrects modeling errors arising from nonlinear deformation, contact, and geometric mismatch. The framework is validated through planar and spatial simulations, including trajectory tracking, attitude regulation, disturbance rejection, three-dimensional position tracking, and simultaneous position-orientation control. Compared with a piecewise-constant-curvature (PCC) baseline, the proposed method consistently reduces tracking errors, suppresses attitude drift, and maintains a bounded Jacobian estimation error. The controller is further applied to morphology-enabled manipulation tasks, including obstacle-assisted reach-wrap-release motions, adaptive whole-arm grasping, and cooperative multi-arm object handling. Results demonstrate that combining logarithmic-spiral morphology with online Jacobian compensation enables accurate, robust, and scalable control of highly underactuated continuum manipulators. The proposed framework establishes a physics-grounded baseline for future hardware implementation and learning-augmented soft robotic control.

软体机器人闭环控制螺旋形态雅可比补偿

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