通过调整柔性结构角度,提升机械臂采摘番茄的稳定与柔韧性能。
Hybrid Robotic Meta-gripper for Tomato Harvesting: Analysis of Auxetic Structures with Lattice Orientation Variations
- 采用刚性外框搭配可变角度的蜂窝状柔性内芯,实现自适应抓握。
- 0°至60°不同倾角中,45°配置在抓取力与能耗间表现最优。
- 结合实验与仿真,为农业机器人抓手设计提供可复用的优化框架。
农业领域正面临全球食物需求增长的挑战,而果蔬采摘等任务仍高度依赖人工,导致效率低下和采后损失。自动化,尤其是选择性采摘,成为可行解决方案,软体机器人技术为此提供了关键支持。本研究提出一种新型混合式番茄采摘夹爪,包含刚性外框与内部柔性负泊松比蜂窝结构。该六指3D笼式设计可在非结构化环境中实现轻柔且稳固的抓取。创新性地,研究系统分析了负泊松比结构单元倾角(0°、30°、45°、60°)对抓握贴合度的影响,结合2D数字图像相关(DIC)实验与非线性有限元分析(FEA)。结果表明,结构倾角显著影响柔顺性、接触力及电机扭矩需求,各角度配置各有优势。该对比框架揭示了根据任务需求定制负泊松比几何形态以优化机器人夹爪性能的新路径,为软-硬混合夹爪设计提供新思路,推动精准农业自动化发展并减少作物损伤。
原文摘要 · Abstract (English)
The agricultural sector is rapidly evolving to meet growing global food demands, yet tasks like fruit and vegetable handling remain labor-intensive, causing inefficiencies and post-harvest losses. Automation, particularly selective harvesting, offers a viable solution, with soft robotics emerging as a key enabler. This study introduces a novel hybrid gripper for tomato harvesting, incorporating a rigid outer frame with a soft auxetic internal lattice. The six-finger, 3D caging-effect design enables gentle yet secure grasping in unstructured environments. Uniquely, the work investigates the effect of auxetic lattice orientation on grasping conformability, combining experimental validation with 2D Digital Image Correlation (DIC) and nonlinear finite element analysis (FEA). Auxetic configurations with unit cell inclinations of 0 deg, 30 deg, 45 deg, and 60 deg are evaluated, and their grasping forces, deformation responses, and motor torque requirements are systematically compared. Results demonstrate that lattice orientation strongly influences compliance, contact forces, and energy efficiency, with distinct advantages across configurations. This comparative framework highlights the novelty of tailoring auxetic geometries to optimize robotic gripper performance. The findings provide new insights into soft-rigid hybrid gripper design, advancing automation strategies for precision agriculture while minimizing crop damage.
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