Abstract
The robustness and efficiency of inverse reliability methods are important issues in reliability-based design optimization (RBDO) using performance measure approach (PMA). The adaptive modified chaos control (ACC), step length adjustment (SA), and relaxed mean value (RMV) methods were recently implemented to improve the robustness and efficiency of PMA. In this paper, a limited descent mean value (LDMV) method is proposed to improve robustness and efficiency of inverse reliability analysis for either convex or concave probabilistic constraints. The LDMV formula is dynamically adjusted by an adaptive step size based on the advanced mean value method (AMV). The robustness and efficiency of the ACC, SA, RMV, and proposed LDMV methods are compared through six nonlinear performance functions. The results illustrated a similar robust performance between LDMV against RMV and FSL methods and superior to the ACC method. The proposed LDMV improves the robustness and efficiency of the inverse first-order reliability method in comparison with existing reliability methods.
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Abbreviations
- AMV:
-
Advanced mean value
- ACC:
-
Adaptive modified chaos control
- LDMV:
-
Limited descent mean value
- RMV:
-
Relaxed mean value
- CC:
-
Chaos control
- SMCC:
-
Self-adaptive modified chaos control
- SA:
-
Step length adjustment
- SMV:
-
Self-adjusted mean value
- MMV:
-
Modified mean value
- CMV:
-
Conjugate mean value
- \({{\varvec{d}}^{\text{L}}}\) :
-
Lower bound of the design vector
- \({{\varvec{d}}^{\text{U}}}\) :
-
Lower bound of the design vector
- SL:
-
Single-loop approach
- DLA:
-
Double loop approach
- HMV:
-
Hybrid mean value
- HMV+ :
-
Enhanced hybrid mean value
- \(f\) :
-
Objective or cost function
- FORM:
-
First-order second-moment method
- \({f_{\varvec{X}}}(x)\) :
-
Joint probability density function of the basic random variables \({\varvec{X}}\)
- \(k\) :
-
Number of iterations
- MCC:
-
Modified chaos control
- MPFP:
-
Most probable failure point
- \({\widetilde {{\varvec{U}}}^{{\text{DMV}}}}\) :
-
Descent search direction vector
- \(p\) :
-
Number of performance functions
- \({P_{\text{f}}}\) :
-
Acceptable failure probability
- PMA:
-
Performance measure approach
- RBDO:
-
Reliability-based design optimization
- RIA:
-
Reliability index approach
- \({\varvec{X}}\) :
-
Random variables in original space
- \({\varvec{U}}\) :
-
Independent standard normal random variable
- \({{\varvec{U}}^*}\) :
-
Most probable failure point
- \(\beta\) :
-
Reliability index
- \(\beta _{{\text{t}}}^{{\text{j}}}\) :
-
Target reliability index of the jth probabilistic constraint
- \(\delta\) :
-
Adjusted parameter
- \(\rho\) :
-
Limited step size
- \(\Phi\) :
-
Standard normal cumulative distribution function
- \({\varvec{\sigma}_{\varvec{x}}}\) :
-
Standard deviations
- \(\varvec{\mu}_{{\varvec{x}}}^{{\text{L}}}\) :
-
Lower mean of the random design vector
- \(\varvec{\mu}_{{\varvec{x}}}^{{\text{U}}}\) :
-
Upper mean of the random design vector
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The authors thank the financial support by the University of Zabol with grant number UOZ-GR-9517-3.
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Yaseen, Z.M., Keshtegar, B. Limited descent-based mean value method for inverse reliability analysis. Engineering with Computers 35, 1237–1249 (2019). https://doi.org/10.1007/s00366-018-0661-z
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DOI: https://doi.org/10.1007/s00366-018-0661-z