Dissertation/Thesis Abstract

Shape For Contact
by Rodriguez Garcia, Alberto, Ph.D., Carnegie Mellon University, 2013, 54; 3575524
Abstract (Summary)

Given a desired function for an effector, what is its appropriate shape? This thesis addresses the problem of designing the shape of a rigid end effector to perform a given manipulation task. It presents three main contributions: First, it describes the contact kinematics of an effector as the product of both its shape and its motion, and assumes a fixed motion model to explore the role of shape in satisfying a certain manipulation task. Second, it formulates that manipulation task as a set of constraints on the geometry of contact between the effector and the world. Third, it develops tools to transform those contact constraints into an effector shape for general 1-DOF planar mechanisms and general 1-DOF spatial mechanisms, and discusses the generalization to mechanisms with more than one degree of freedom.

We describe the case studies of designing grippers with invariant grasp geometry, grippers with improved grasp stability, and grippers with extended grasp versatility. We further showcase the techniques with the design of the fingers of the MLab hand, a three-fingered gripper actuated with a single motor, capable of exerting any combination of geometrically correct enveloping or fingertip grasps of spherical, cylindrical, and prismatic objects of varying size.

Indexing (document details)
Advisor: Mason, Matthew T.
Commitee: Choset, Howie, Kumar, Vijay, Srinivasa, Siddhartha
School: Carnegie Mellon University
Department: Robotics
School Location: United States -- Pennsylvania
Source: DAI-B 75/02(E), Dissertation Abstracts International
Source Type: DISSERTATION
Subjects: Mechanical engineering, Robotics
Keywords: Effector function, Grippers, Rigid end effectors, Robotic manipulation
Publication Number: 3575524
ISBN: 978-1-303-53641-0
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