渦吸着グリッパによる柔軟物把持時の渦誘起トルク:形状と空気圧パラメータの影響
Vortex-Induced Torque in Grasping Soft Objects: Influence of Geometry and Pneumatic Parameters
渦式グリッパで柔軟物を把持する際に生じる回転トルクを、供給圧力・ノズル径・表面形状・曲率の影響として実験的に定量化し、ガウス過程回帰で予測できることを示した研究。
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著者: Roman Mykhailyshyn, Tomohiro Motoda, Ivan Virgala, Ann Majewicz Fey, Yukiyasu Domae
分類: cs.RO
原文アブストラクト
Vortex grippers are commonly integrated into automated systems for handling objects with complex geometries in packaging, sorting, and assembling. However, their interaction with compliant objects remains difficult to predict, particularly with respect to the vortex-induced torque transmitted during grasping. This study investigates vortex-induced torque during the grasping of compliant objects and quantifies the coupled effects of supply pressure, tangential nozzle diameter, surface geometry, and curvature. The results show that increasing the tangential nozzle diameter primarily enhances the sensitivity of the generated torque to supply pressure rather than producing a uniformly higher torque. Surface geometry also strongly influences the rotational interaction, with dome-concave surfaces generally producing substantially greater torque than corresponding dome-convex surfaces, whereas the difference between cylindrical concave and convex surfaces is comparatively small. The strongest and most repeatable response was observed for a dome-concave surface exhibiting favorable object-gripper geometric matching. Among the evaluated machine-learning regression methods, Gaussian Process Regression provided the best overall predictive performance under repeated cross-validation, demonstrating that vortex-induced torque can be estimated from combined pneumatic and geometric parameters. These findings provide a basis for predicting and utilizing vortex-induced torque in the dexterous manipulation of soft objects.
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