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TECHNICAL PAPERS

An Interdisciplinary Framework for the Design and Life Prediction of Engineering Systems

[+] Author and Article Information
Rishi Raj

Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO 80309-0427e-mail: Rishi.Raj@Colorado.edu

J. Eng. Mater. Technol 122(3), 348-354 (Mar 01, 2000) (7 pages) doi:10.1115/1.482808 History: Received December 15, 1999; Revised March 01, 2000
Copyright © 2000 by ASME
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Figures

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The separate influence of different sources of variability on the probability density function for the lifetime of the light bulb
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The influence of microstructure on the variability of the whole systems. The upper curve shows the probability distribution function when all sources of variability (see next figure) are considered; the lower curve shows the variability when the microstructure is excluded from the analysis.
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A flow chart for analyzing the influence of variables lying within the subsystems on the overall variability of the system
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The Linking Variable Space for the design of the tungsten filament in order to achieve a lifetime of 750 h at temperature lying between 2800 and 3000 K
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Partitioning of the matrix in Fig. 5 into subsystems and linking variables by reordering the functions and variables
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Four types of partitionings
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The functions and variables for the performance, design and materials science of the tungsten coil represented in a matrix form. The full functions are described in reference 1.
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The geometrical parameters of the tungsten coil
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The relationship between the microstructure of the tungsten and the creep rate of the filament for incandescent lamps: (a) bamboo grains, (b) equiaxed grains, and (c) elongated grains
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Nonhierarchical partitioning of the system into subsystems and linking variables. There are two kinds of subsystems: one related to performance and the others to traditional disciplines.
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The integrated design of a system is carried out in three steps: model reduction within subdisciplines, partitioning, and interactive design

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