论文标题

带有选择性转向的多段,软生长的机器人

A Multi-Segment, Soft Growing Robot with Selective Steering

论文作者

Kübler, Alexander M., Rivera, Sebastián Urdaneta, Raphael, Frances B., Förster, Julian, Siegwart, Roland, Okamura, Allison M.

论文摘要

Everting,Ever,软化的藤蔓机器人受益于对环境的减少摩擦,这使他们能够驾驶具有挑战性的地形。藤机器人可以使用附带的空气袋进行侧向转向。但是,当所有小袋串行连接时,整个机器人只能在自由空间中执行一个常数曲率。它必须与环境接触,以通过多个转弯沿路径的障碍物导航。这项工作提出了一个多段的藤质机器人,该机器人可以在不与环境交互的情况下浏览复杂的路径。这是通过一种新的转向方法来实现的,该方法有选择地将每个小袋在尖端上绘制,从而提供了很高的自由度,几乎没有控制输入。一个小的磁阀将每个小袋连接到压力电源线。电动尖端安装座使用藤质机器人外材料上的互锁机构和电动辊。当每个阀通过尖端安装座时,尖端安装内部的永久磁铁打开阀门,因此相应的袋在同一时刻连接到压力供应线。与其他最先进的藤蔓机器人相比,新型圆柱性气动人造肌肉(CPAM)被整合到藤质机器人中,并膨胀到圆柱形形状,以改善弯曲特性。电动尖端安装座控制着连续的Eversion速度,并可以控制撤回。最终的原型能够重复生长成不同的形状并保持这些形状。我们使用模型预测路径,该模型假设沿多段藤定机器人的外部进行分段恒定曲率。提出的多段转向方法可以扩展到其他软连续机器人设计。

Everting, soft growing vine robots benefit from reduced friction with their environment, which allows them to navigate challenging terrain. Vine robots can use air pouches attached to their sides for lateral steering. However, when all pouches are serially connected, the whole robot can only perform one constant curvature in free space. It must contact the environment to navigate through obstacles along paths with multiple turns. This work presents a multi-segment vine robot that can navigate complex paths without interacting with its environment. This is achieved by a new steering method that selectively actuates each single pouch at the tip, providing high degrees of freedom with few control inputs. A small magnetic valve connects each pouch to a pressure supply line. A motorized tip mount uses an interlocking mechanism and motorized rollers on the outer material of the vine robot. As each valve passes through the tip mount, a permanent magnet inside the tip mount opens the valve so the corresponding pouch is connected to the pressure supply line at the same moment. Novel cylindrical pneumatic artificial muscles (cPAMs) are integrated into the vine robot and inflate to a cylindrical shape for improved bending characteristics compared to other state-of-the-art vine robots. The motorized tip mount controls a continuous eversion speed and enables controlled retraction. A final prototype was able to repeatably grow into different shapes and hold these shapes. We predict the path using a model that assumes a piecewise constant curvature along the outside of the multi-segment vine robot. The proposed multi-segment steering method can be extended to other soft continuum robot designs.

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