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Development and characterisation of error functions in design

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Abstract

As simulation is increasingly used in product development, there is a need to better characterise the errors inherent in simulation techniques by comparing such techniques with evidence from experiment, test and in-service. This is necessary to allow judgement of the adequacy of simulations in place of physical tests and to identify situations where further data collection and experimentation need to be expended. This paper discusses a framework for uncertainty characterisation based on the management of design knowledge leading to the development and characterisation of error functions. A classification is devised in the framework to identify the most appropriate method for the representation of error, including probability theory, interval analysis and Fuzzy set theory. The development is demonstrated with two case studies to justify rationale of the framework. Such formal knowledge management of design simulation processes can facilitate utilisation of cumulated design knowledge as companies migrate from testing to simulation-based design.

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Notes

  1. The support is a real set of all values of a Fuzzy set where the membership is greater than zero.

Abbreviations

CAE:

Computer-aided engineering

CFD:

Computational fluids dynamics

IPD:

Integrated product development

FEA:

Finite element analysis

FS:

Factor of safety

PDF:

Probability distribution function

POF:

Probability of failure

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Acknowledgments

This paper reports research conducted by Dr. Goh while a postgraduate student at the University of Bristol, supported by a Postgraduate Scholarship from that University and by the UK Overseas Research Students Award Scheme (ORSAS). This support is gratefully acknowledged, as is assistance from Dr. J. Devlukia and Mr. A. D’Cruz of Land Rover with one of the case studies reported here.

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Correspondence to C. A. McMahon.

Appendix A: Literature cases

Appendix A: Literature cases

Table 4 Twenty literature cases to exemplify the proposed classification (Goh et al. 2005a)

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Goh, Y.M., McMahon, C.A. & Booker, J.D. Development and characterisation of error functions in design. Res Eng Design 18, 129–148 (2007). https://doi.org/10.1007/s00163-007-0034-x

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