Efficient reliability-based design optimization using a hybrid space with application to finite element analysis |
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Authors: | G Kharmanda A Mohamed M Lemaire |
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Affiliation: | (1) LaRAMA — IFMA/UBP, Campus de Clermont-Ferrand les Cézeaux, BP 265, 63175 Aubière cedex, France |
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Abstract: | The design of high technology structures aims to define the best compromise between cost and safety. The Reliability-Based
Design Optimization (RBDO) allows us to design structures which satisfy economical and safety requirements. However, in practical
applications, the coupling between the mechanical modelling, the reliability analyses and the optimization methods leads to
very high computational time and weak convergence stability. Traditionally, the solution of the RBDO model is achieved by
alternating reliability and optimization iterations. This approach leads to low numerical efficiency, which is disadvantageous
for engineering applications on real structures. In order to avoid this difficulty, we propose herein a very efficient method
based on the simultaneous solution of the reliability and optimization problems. The procedure leads to parallel convergence
for both problems in a Hybrid Design Space (HDS). The efficiency of the proposed methodology is demonstrated on the design
of a steel hook, where the RBDO is combined with Finite Element Analysis (FEA). |
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Keywords: | reliability-based design optimization finite element analysis reliability analysis |
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