RESEARCH PAPERS: Design Theory and Methodology Papers

Computations with Imprecise Parameters in Engineering Design: Background and Theory

[+] Author and Article Information
K. L. Wood, E. K. Antonsson

Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA 91125

J. Mech., Trans., and Automation 111(4), 616-625 (Dec 01, 1989) (10 pages) doi:10.1115/1.3259045 History: Received February 01, 1988; Online November 19, 2009


A technique to perform design calculations on imprecise representations of parameters has been developed and is presented. The level of imprecision in the description of design elements is typically high in the preliminary phase of engineering design. This imprecision is represented using the fuzzy calculus. Calculations can be performed using this method, to produce (imprecise) performance parameters from imprecise (input) design parameters. The Fuzzy Weighted Average technique is used to perform these calculations. A new metric, called the γ-level measure, is introduced to determine the relative coupling between imprecise inputs and outputs. The background and theory supporting this approach are presented, along with one example.

Copyright © 1989 by ASME
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