Control of robust design in multiobjective optimization under uncertainties

Authors:
Tohid Erfani;Sergei V. Utyuzhnikov
Affiliations:
School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester, UK M60 1QD;School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester, UK M60 1QD
Venue:
Structural and Multidisciplinary Optimization
Year:
2012

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Abstract

In design and optimization problems, a solution is called robust if it is stable enough with respect to perturbation of model input parameters. In engineering design optimization, the designer may prefer a use of robust solution to a more optimal one to set a stable system design. Although in literature there is a handful of methods for obtaining such solutions, they do not provide a designer with a direct and systematic control over a required robustness. In this paper, a new approach to robust design in multiobjective optimization is introduced, which is able to generate robust design with model uncertainties. In addition, it introduces an opportunity to control the extent of robustness by designer preferences. The presented method is different from its other counterparts. For keeping robust design feasible, it does not change any constraint. Conversely, only a special tunable objective function is constructed to incorporate the preferences of the designer related to the robustness. The effectiveness of the method is tested on well known engineering design problems.