Abstract
This study aims to improve the efficiency of distortion base mode selection using Principal Component Analysis (PCA) and enhance structural response estimation techniques for digital twin applications in the maritime structures. Real-time determination of loads on a structure is essential for digitalisation in the maritime sector. Methods such as modal superposition and inverse finite element methods have been investigated to calculate loads at arbitrary points from a limited number of sensors. The objective of this study is to estimate loads by using a conversion matrix constructed by distortion base modes. In this study, modes are selected based on the response to regular waves. To achieve this, a distinct algorithm has been developed to select orthogonal modes. This study proposes a novel mode selection method by implementing PCA, which enables obtaining the most representative direction. Wave load case with responses which is most parallel to this direction is determined to be the first mode. To validate our methodology, we estimate hotspot stresses on an FPSO. This method reduces computation time while maintaining high accuracy of estimation. These findings show potential for application to other offshore structures. Further research using actual measurement data is expected to enhance the validity and reliability of these techniques, making a significant contribution to the field of maritime structural analysis and digital twin technology.
