The objective of this study is to develop the sensor-based structural health monitoring (SHM) system using a reduced order model (ROM) wherein a modal superposition method is implemented to reconstruct hull girder load distributions of the entire structure under wave-induced loads. Seakeeping and finite element (FE) analyses are performed to obtain the structural response for various wave conditions. A set of specific wave headings and frequencies is selected to construct base wave modes, and the structural response can be reconstructed under arbitrary wave loads. Case studies using a containership and an FPSO have been conducted to verify this new methodology.

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