Geometric Tolerancing in Mechanical Design Using Fractal-Based Parameters

Author:

Srinivasan R. S.1,Wood Kristin L.1

Affiliation:

1. ETC 5.160, The University of Texas, Austin, TX 78712-1063

Abstract

The submacrogeometric (tolerance) variations of mechanical components have an important impact on product function. The problem of combining tolerance assignment in engineering design with tolerance control in manufacturing and quality assurance presents a continuing challenge to researchers. This paper illustrates the feasibility of using fractal-based methods for the problem of tolerance specification in engineering design. Error data are generated as a function of the fractal dimension using the fractional Brownian motion model and are superposed on an ideal profile of a slider bearing. The consequent changes in performance parameters are studied and the detrimental effect of large variations perceived. This simple case study indicates the potential of the method to be extended for more complex problems.

Publisher

ASME International

Subject

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

Reference22 articles.

1. ANSI-Y14.5M, 1982, “Geometric Dimensioning and Tolerancing,” ANSI Standard Y14.5M-82.

2. Bjorke, O., 1989, Computer-Aided Tolerancing, ASME Press, New York.

3. Chase, K. W., and Greenwood, W. H., 1987, “Design Issues in Mechanical Tolerance Analysis,” Advanced Topics in Manufacturing Technology, pp. 11–26, ASME Winter Annual Meeting, Boston, MA.

4. Christensen H. , 1969, “Stochastic Models for Hydrodynamic Lubrication of Rough Surfaces,” Proc. of the Instn. of Mech. Engrs., Vol. 184, Pt. 1, No. 55, pp. 1013–1026.

5. Finger S. , and DixonJ. R., 1989, “A Review of Research in Mechanical Design. Part II: Representations, Analysis and Design for the Life Cycle,” Research in Engineering Design, Vol. 1, No. 2, pp. 121–137.

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