Spherical Mechanism Synthesis in Virtual Reality

Author:

Furlong T. J.1,Vance J. M.2,Larochelle P. M.3

Affiliation:

1. Creative Optics, Inc., Bedford, NH 03110

2. Department of Mechanical Engineering, Virtual Reality Applications Center, Iowa State University, Ames, IA 50011

3. Department of Mechanical Engineering, Florida Institute of Technology, Melbourne, FL 32901-6975

Abstract

This paper presents a new approach to using virtual reality (VR) to design spherical mechanisms. VR provides a three-dimensional (3-D) design space where a designer can input design positions using a combination of hand gestures and motions and view the resultant mechanism in stereo using natural head movement to change the viewpoint. Because of the three-dimensional nature of the design and verification of spherical mechanisms, VR is examined as a new design interface in this research. In addition to providing a VR environment for design, the research presented in this paper has focused on developing a “design in context” approach to spherical mechanism design. Previous design methods have involved placing coordinate frames along the surface of a constraint sphere. The new “design in context” approach allows a designer to freely place geometric models of movable objects inside an environment consisting of fixed objects. The fixed objects could either act as a base for a mechanism or be potential sources of interference with the motion of the mechanism. This approach allows a designer to perform kinematic synthesis of a mechanism while giving consideration to the interaction of that mechanism with its application environment.

Publisher

ASME International

Subject

Computer Graphics and Computer-Aided Design,Computer Science Applications,Mechanical Engineering,Mechanics of Materials

Reference19 articles.

1. Chen, X. Q., and Erdman, A. G., “Systematic Synthesis of Spherical Four-Bar Mechanisms,” First National Applied Mechanisms and Robotics Conference, University of Cincinnati, 89AMR-78-5, Nov. 1989.

2. Erdman, A. G., and Gustafson, J. E., “LINCAGES: Linkages INteractive Computer Analysis and Graphically Enhanced Synthesis Package,” ASME paper 77-DET-5, presented at ASME Design Engineering Technical Conference, Sept. 26–30, 1977.

3. Erdman, A., and Sandor, G. N., Mechanism Design: Analysis and Synthesis, Prentice Hall, Englewood Cliffs, New Jersey, 1991.

4. Erdman, A., and Sandor, G. N., Advanced Mechanism Design: Analysis and Synthesis, Prentice Hall, Englewood Cliffs, New Jersey, 1997.

5. Evans, P. T., Vance, J. M., and Dark, V. J., “Assessing the Effectiveness of Traditional and Virtual Reality Interfaces in Spherical Mechanism Design,” ASME JOURNAL OF MECHANICAL DESIGN, in press, 1999.

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