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LIMITATIONS OF DESIGN SPACE-BASED INDICATORS FOR EARLY ROBUSTNESS ASSESSMENT

Published online by Cambridge University Press:  27 July 2021

Herle Bagh Juul-Nyholm ,
Nökkvi S. Sigurdarson ,
Martin Ebro  and
Tobias Eifler
Herle Bagh Juul-Nyholm*
Affiliation:
Technical University of Denmark;
Nökkvi S. Sigurdarson
Affiliation:
Technical University of Denmark; Novo Nordisk A/S
Martin Ebro
Affiliation:
Novo Nordisk A/S
Tobias Eifler
Affiliation:
Technical University of Denmark;
*
Juul-Nyholm, Herle Bagh, Danmarks Tekniske Universitet / Technical University of Denmark Denmark, hbaju@mek.dtu.dk

Abstract

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This paper seeks to address the gap between qualitative Robust Design principles and parameter optimization. The former often fails to consider the challenging amount of details in embodiment and configuration design, while the latter is the widely accepted main thrust in traditional Robust Design. The gap is addressed by exploring the value of five quantitative robustness indicators for Design Space Exploration based on variables, objectives and constraints: The set level indicators, Design Space Size and Pareto Set Dispersion, and the point level indicators, Neighbourhood Performance, Failure Rate and Distance to Failure. As a background for the discussion of the limitations of these indicators an industrial case is presented. The case is an incremental encoder and includes two configurations for comparison, five objectives, eight variables, and a range of constraints. The design spaces are sampled and they show conflicting objectives, dispersed spaces and variables dependencies. Based on this it is suggested that set level indicators are more suitable than point level indicators of early robustness evaluation, but the available indicators are limited in their considerations of design space discontinuity and conflicts.

Keywords

Robust designComputational design methodsEvaluation, Design Space ExplorationConfiguration Design
Type
Article
Information
Proceedings of the Design Society , Volume 1: ICED21 , August 2021 , pp. 1977 - 1986
Creative Commons
Creative Common License - CCCreative Common License - BYCreative Common License - NCCreative Common License - ND
This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is unaltered and is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use or in order to create a derivative work.
Copyright
The Author(s), 2021. Published by Cambridge University Press

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