Structural integrity management of offshore structures via RB-FEA and fast full load mapping based digital twins
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Copyright 2018 by the International Society of Offshore and Polar Engineers (ISOPE) In this work we discuss new capabilities for structural integrity analysis of critical offshore assets such as semi-submersibles and FPSOs that are enabled by Reduced Basis FEA (RB-FEA) coupled with Fast Full Load Mapping to enable high-fidelity Digital Twins. RB-FEA is a new structural simulation framework based on component-based model order reduction, in which (i) a large model is decomposed into components, (ii) each component is endowed with parameters which enable geometric, material, and/or load data to be modified on the fly, (iii) a reduced order model of each component (valid for the entire parameter range) is prepared based on an automated pre-analysis of individual components and groups of components, and (iv) component-based models are assembled and solved very efficiently due to re-use of the reduced order model data. For large models this framework enables orders-of-magnitude increase in model detail and solver speed compared to conventional FEA, without sacrificing accuracy. Fast Full Load Mapping obtains full distributive loads acting on a floating body in random waves at costs of conventional global performance analyses, without any costly CFD. In time domain, these full distributive loads are fed into RB-FEA, and the combination of these two powerful approaches enables new capabilities for detailed hydrodynamic and structural analysis of critical offshore assets. We demonstrate these capabilities with some illustrative examples.
