Algebraic Motion Approximation With NURBS Motions and Its Application to Spherical Mechanism Synthesis

[+] Author and Article Information
Q. Jeffrey Ge

Department of Mechanical Engineering, State University of New York at Stony Brook, Stony Brook, NY 11794-2300

P. M. Larochelle

Mechanical Engineering Program, Florida institute of Technology, Melbourne, FL 32901-6988

J. Mech. Des 121(4), 529-532 (Dec 01, 1999) (4 pages) doi:10.1115/1.2829493 History: Received April 01, 1998; Revised September 01, 1999; Online December 11, 2007


In this work we bring together classical mechanism theory with recent works in the area of Computer Aided Geometric Design (CAGD) of rational motions as well as curve approximation techniques in CAGD to study the problem of mechanism motion approximation from a computational geometric viewpoint. We present a framework for approximating algebraic motions of spherical mechanisms with rational B-Spline spherical motions. Algebraic spherical motions and rational B-spline spherical motions are represented as algebraic curves and rational B-Spline curves in the space of quaternions (or the image space). Thus the problem of motion approximation is transformed into a curve approximation problem, where concepts and techniques in the field of Computer Aided Geometric Design and Computational Geometry may be applied. An example is included at the end to show how a NURBS motion can be used for synthesizing spherical four-bar linkages.

Copyright © 1999 by The American Society of Mechanical Engineers
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