Design optimization problems under random uncertainties are commonly formulated with constraints in probabilistic forms. This formulation, also referred to as reliability-based design optimization (RBDO), has gained extensive attention in recent years. Most researchers assume that reliability levels are given based on past experiences or other design considerations without exploring the constrained space. Therefore, inappropriate target reliability levels might be assigned, which either result in a null probabilistic feasible space or performance underestimations. In this research, we investigate the maximal reliability within a probabilistic constrained space using modified efficient global optimization (EGO) algorithm. By constructing and improving Kriging models iteratively, EGO can obtain a global optimum of a possibly disconnected feasible space at high reliability levels. An infill sampling criterion (ISC) is proposed to enforce added samples on the constraint boundaries to improve the accuracy of probabilistic constraint evaluations via Monte Carlo simulations. This limit state ISC is combined with the existing ISC to form a heuristic approach that efficiently improves the Kriging models. For optimization problems with expensive functions and disconnected feasible space, such as the maximal reliability problems in RBDO, the efficiency of the proposed approach in finding the optimum is higher than those of existing gradient-based and direct search methods. Several examples are used to demonstrate the proposed methodology.
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June 2010
Research Papers
A Modified Efficient Global Optimization Algorithm for Maximal Reliability in a Probabilistic Constrained Space
Kuei-Yuan Chan
Kuei-Yuan Chan
Assistant Professor of Mechanical Engineering
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Yen-Chih Huang
Graduate Student
Kuei-Yuan Chan
Assistant Professor of Mechanical Engineering
J. Mech. Des. Jun 2010, 132(6): 061002 (11 pages)
Published Online: May 20, 2010
Article history
Received:
August 11, 2009
Revised:
March 11, 2010
Online:
May 20, 2010
Published:
May 20, 2010
Citation
Huang, Y., and Chan, K. (May 20, 2010). "A Modified Efficient Global Optimization Algorithm for Maximal Reliability in a Probabilistic Constrained Space." ASME. J. Mech. Des. June 2010; 132(6): 061002. https://doi.org/10.1115/1.4001532
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