Effect of conformability on grasp static stability

Author

Hurtado, Jose F. ; Melkote, Shreyes N.

Author_Institution

George W. Woodruff Sch. of Mech. Eng., Georgia Inst. of Technol., Atlanta, GA, USA

Volume

2

fYear

2001

fDate

2001

Firstpage

1086

Abstract

A model to predict the effect of global and local conformability on grasp static stability is presented. Conformability is defined as the geometric similarity between a workpiece and the smallest polyhedron fit over all contacts. Two conformability metrics, C₁ and C₂, that quantify global and local conformability, respectively, are introduced. All stiffness components, including workpiece bulk stiffness, are considered in the model. The two metrics are used to analyze the effect of conformability on grasp static stability via examples. These examples show that grasp stability can increase or decrease with conformability depending on the position of the fingers with respect to the line of action of the externally applied loads. Variation in stability and conformability for different assumptions of finger and workpiece stiffness are also discussed.

Keywords

dexterous manipulators; geometry; stability; geometric similarity; global conformability; grasp static stability; local conformability; smallest polyhedron fit; stiffness; Computational geometry; Distortion measurement; Fingers; Fixtures; Humans; Robots; Rotation measurement; Scattering; Solid modeling; Stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Robotics and Automation, 2001. Proceedings 2001 ICRA. IEEE International Conference on

ISSN

1050-4729

Print_ISBN

0-7803-6576-3

Type

conf

DOI

10.1109/ROBOT.2001.932738

Filename

932738