用鞭子原理模拟章鱼触手伸展，发现水环境是关键。
Octopus-like Reaching Motion: A Perspective Inspired by Whipping
- 用柔性材料在水中做鞭状摆动实验，模拟章鱼触手运动。
- 150 rpm驱动下，触手弯曲传播与真实章鱼相似。
- 水的阻力让鞭动产生生物特性，适合仿生机器人研究。
章鱼触手的典型伸展运动因其对高度可变形体的高效控制而受到广泛关注。先前研究指出，其特征性的弯折传播可能与鞭子的动力学具有共同原理。本文探究了水中鞭状被动动力学能否复现生物伸展中的运动学特征及其异同。通过系统改变材料刚度和驱动速度，在水和空气中进行了基于平台的鞭动实验。基于图像的量化分析显示，由Ecoflex Gel 2制成的触手在150 rpm（电机转速）下实现了与章鱼伸展相似的曲率传播。然而，其弯折点速度呈单调下降趋势，而非生物体中观察到的类钟形分布，表明章鱼伸展并非单纯的被动鞭动行为。空气中无传播现象进一步凸显了周围介质在形成章鱼式伸展运动中的关键作用。该研究为理解生物伸展运动提供了新视角，并为未来水动力学研究提供潜在平台。
原文摘要 · Abstract (English)
The stereotypical reaching motion of the octopus arm has drawn growing attention for its efficient control of a highly deformable body. Previous studies suggest that its characteristic bend propagation may share underlying principles with the dynamics of a whip. This work investigates whether whip-like passive dynamics in water can reproduce the kinematic features observed in biological reaching and their similarities and differences. Platform-based whipping tests were performed in water and air while systematically varying material stiffness and driving speed. Image-based quantification revealed that the Ecoflex Gel 2 arm driven at 150 rpm (motor speed) reproduced curvature propagation similar to that observed in octopus reaching. However, its bend-point velocity decreased monotonically rather than exhibiting the biological bell-shaped profile, confirming that the octopus reaching movement is not merely a passive whipping behavior. The absence of propagation in air further highlights the critical role of the surrounding medium in forming octopus-like reaching motion. This study provides a new perspective for understand biological reaching movement, and offers a potential platform for future hydrodynamic research.
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