Metamodel approach for reliability-based design optimization of a steel catenary riser |
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Authors: | He Zhen Yang Wenqing Zheng |
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Institution: | (1) State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai, People’s Republic of China |
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Abstract: | A reliability-based design optimization (RBDO) methodology is presented for the design of a steel catenary riser (SCR) under
dynamic environmental loads. The purpose of this work is to optimize the cost of products subjected to probabilistic constraints.
Searching for the optimal design of the riser in a wide range of design variables is computationally very expensive if time-consuming
codes for dynamic analysis are necessary in the iteration process. In this study, the effectiveness of the proposed RBDO using
a metamodel is firstly studied and validated through a beam test, then applied to the industrial dynamic optimization problem.
The design variables of structures are assumed to be uncertain, and some other parameters such as loading and material properties
are considered random. The performance function is approximated using metamodels to avoid time-consuming finite-element analysis
during the optimization iteration. A single-loop method is used to decouple the double-loop RBDO problem. The reliability
is finally confirmed through Monte Carlo simulations. According to the analysis, the presented methodology is more rational
and realistic compared with deterministic optimization. |
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