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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2510.25520 |
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| _version_ | 1866910024272445440 |
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| author | Zhang, Shengyao Zhang, Yiyuan Zhang, Chenrui Li, Yiming Xin, Wenci Liufu, Yuliang Ng, Hong Wei Laschi, Cecilia |
| author_facet | Zhang, Shengyao Zhang, Yiyuan Zhang, Chenrui Li, Yiming Xin, Wenci Liufu, Yuliang Ng, Hong Wei Laschi, Cecilia |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_25520 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Octopus-like Reaching Motion: A Perspective Inspired by Whipping Zhang, Shengyao Zhang, Yiyuan Zhang, Chenrui Li, Yiming Xin, Wenci Liufu, Yuliang Ng, Hong Wei Laschi, Cecilia Robotics Biological Physics 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. |
| title | Octopus-like Reaching Motion: A Perspective Inspired by Whipping |
| topic | Robotics Biological Physics |
| url | https://arxiv.org/abs/2510.25520 |