Engineering design decisions inherently are made under risk and uncertainty. The characterization of this uncertainty is an essential step in the decision process. In this paper, we consider imprecise probabilities (e.g., intervals of probabilities) to express explicitly the precision with which something is known. Imprecision can arise from fundamental indeterminacy in the available evidence or from incomplete characterizations of the available evidence and designer’s beliefs. The hypothesis is that, in engineering design decisions, it is valuable to explicitly represent this imprecision by using imprecise probabilities. This hypothesis is supported with a computational experiment in which a pressure vessel is designed using two approaches, both variations of utility-based decision making. In the first approach, the designer uses a purely probabilistic, precise best-fit normal distribution to represent uncertainty. In the second approach, the designer explicitly expresses the imprecision in the available information using a probability box, or p-box. When the imprecision is large, this p-box approach on average results in designs with expected utilities that are greater than those for designs created with the purely probabilistic approach, suggesting that there are design problems for which it is valuable to use imprecise probabilities.
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July 2006
Research Papers
The Value of Using Imprecise Probabilities in Engineering Design
Jason Matthew Aughenbaugh
,
Jason Matthew Aughenbaugh
Systems Realization Laboratory, G. W. Woodruff School of Mechanical Engineering,
jaughenbaugh.me03@gtalumni.org
Georgia Institute of Technology
, Atlanta, GA 30332-0405
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Christiaan J. J. Paredis
Christiaan J. J. Paredis
Systems Realization Laboratory, G. W. Woodruff School of Mechanical Engineering,
chris.paredis@me.gatech.edu
Georgia Institute of Technology
, Atlanta, GA 30332-0405
Search for other works by this author on:
Jason Matthew Aughenbaugh
Systems Realization Laboratory, G. W. Woodruff School of Mechanical Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0405jaughenbaugh.me03@gtalumni.org
Christiaan J. J. Paredis
Systems Realization Laboratory, G. W. Woodruff School of Mechanical Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0405chris.paredis@me.gatech.edu
J. Mech. Des. Jul 2006, 128(4): 969-979 (11 pages)
Published Online: December 21, 2005
Article history
Received:
September 13, 2005
Revised:
December 21, 2005
Citation
Aughenbaugh, J. M., and Paredis, C. J. J. (December 21, 2005). "The Value of Using Imprecise Probabilities in Engineering Design." ASME. J. Mech. Des. July 2006; 128(4): 969–979. https://doi.org/10.1115/1.2204976
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