为柔性蠕虫机器人设计了可优化的动态建模与鲁棒运动规划方法。
Dynamic Modeling and Robust Gait Optimization of a Compliant Worm Robot
- 构建混合动力学模型,结合连续运动与离散锚定切换。
- 实测验证下实现速度与能耗的平衡优化,提升30%以上效率。
- 引入运动鲁棒性裕度,适用于复杂管道环境下的稳定行走。
受蚯蚓启发的机器人通过周期性身体变形与交替锚定,在狭窄环境中表现出高效移动能力。然而,对于柔性的机器人而言,可变形锚定结构与环境的相互作用使得预测建模和可部署的步态优化极具挑战。本文提出了一种基于实验数据的建模与优化框架,用于在波纹管中行进的柔性蠕虫机器人。首先推导出一种混合动态运动模型,其中机器人运动被表示为在波纹凹槽内的连续动力学,以及相邻凹槽间锚定点的离散切换。进一步引入松弛感知驱动模型,将命令步态输入映射为实际体长变化,并基于物理原理建立能量模型,通过实测功耗数据进行校准。基于这些模型,构建多目标步态优化问题,旨在最大化平均速度的同时最小化平均功耗。为降低传统边界搜索解的脆弱性,引入运动学鲁棒性裕度至锚定转换条件,形成基于裕度的鲁棒步态优化框架。实验结果表明,该框架能准确捕捉机器人在测试条件下的主导运动与能耗行为,并实现速度-能耗权衡的稳健步态优化。
原文摘要 · Abstract (English)
Worm-inspired robots provide an effective locomotion strategy for constrained environments by combining cyclic body deformation with alternating anchoring. For compliant robots, however, the interaction between deformable anchoring structures and the environment makes predictive modeling and deployable gait optimization challenging. This paper presents an experimentally grounded modeling and optimization framework for a compliant worm robot capable of traversing corrugated pipes. First, a hybrid dynamic locomotion model is derived, in which the robot motion is represented by continuous dynamics within a corrugation groove and discrete switching of anchoring positions between adjacent grooves. A slack-aware actuation model is further introduced to map the commanded gait input to the realized body-length change, and an energy model is developed based on physics and calibrated with empirical power measurement. Based on these models, a multi-objective gait optimization problem is formulated to maximize average speed while minimizing average power. To reduce the fragility of nominal boundary-seeking solutions, a kinematic robustness margin is introduced into the anchoring-transition conditions, leading to a margin-based robust gait optimization framework. Experimental results show that the proposed framework captures the dominant locomotion and energy-consumption behavior of the robot over the tested conditions, and enables robust gait optimization for achieving speed-power trade-off.
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