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Analysis on Stable Grasping based on Three-dimensional Acceleration Convex Polytope for Multi-fingered Robot

3차원 Acceleration Convex Polytope를 기반으로 한 로봇 손의 안정한 파지 분석

  • 장명언 (국방과학연구소) ;
  • 이지홍 (충남대학교 BK21 메카트로닉스사업단)
  • Published : 2009.01.01

Abstract

This article describes the analysis of stable grasping for multi-fingered robot. An analysis method of stable grasping, which is based on the three-dimensional acceleration convex polytope, is proposed. This method is derived from combining dynamic equations governing object motion and robot motion, force relationship and acceleration relationship between robot fingers and object's gravity center through contact condition, and constraint equations for satisfying no-slip conditions at every contact points. After mapping no-slip condition to torque space, we derived intersected region of given torque bounds and the mapped region in torque space so that the intersected region in torque space guarantees no excessive torque as well as no-slip at the contact points. The intersected region in torque space is mapped to an acceleration convex polytope corresponding to the maximum acceleration boundaries which can be exerted by the robot fingers under the given individual bounds of each joints torque and without causing slip at the contacts. As will be shown through the analysis and examples, the stable grasping depends on the joint driving torque limits, the posture and the mass of robot fingers, the configuration and the mass of an object, the grasp position, the friction coefficients between the object surface and finger end-effectors.

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Cited by

  1. Grasp stability analysis based on acceleration convex polytopes for multi-fingered robot hands vol.7, pp.2, 2009, https://doi.org/10.1007/s12555-009-0211-y