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Relaxed performance measure approach for reliability-based design optimization

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Abstract

The efficiency and robustness of reliability analysis methods are important factors to evaluate the probabilistic constraints in reliability-based design optimization (RBDO). In this paper, a relaxed mean value (RMV) approach is proposed in order to evaluate probabilistic constraints including convex and concave functions in RBDO using the performance measure approach (PMA). A relaxed factor is adaptively determined in the range from 0 to 2 using an inequality criterion to improve the efficiency and robustness of the inverse first-order reliability methods. The performance of the proposed RMV is compared with six existing reliability methods, including the advanced mean value (AMV), conjugate mean value (CMV), hybrid mean value (HMV), chaos control (CC), modified chaos control (MCC), and conjugate gradient analysis (CGA) methods, through four nonlinear concave and convex performance functions and three RBDO problems. The results demonstrate that the proposed RMV is more robust than the AMV, CMV, and HMV for highly concave problems, and slightly more efficient than the CC, MCC, and CGA methods. Furthermore, the proposed relaxed mean value guarantees robust and efficient convergence for RBDO problems with highly nonlinear performance functions.

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Authors and Affiliations

  1. Department of Civil Engineering, University of Zabol, P.B. 98615-538, Zabol, Iran

    Behrooz Keshtegar

  2. Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Yuseong-gu, Korea

    Ikjin Lee

Authors
  1. Behrooz Keshtegar
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  2. Ikjin Lee
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Correspondence to Behrooz Keshtegar.

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Keshtegar, B., Lee, I. Relaxed performance measure approach for reliability-based design optimization. Struct Multidisc Optim 54, 1439–1454 (2016). https://doi.org/10.1007/s00158-016-1561-8

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  • DOI: https://doi.org/10.1007/s00158-016-1561-8

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