Session: 06-03-01 Fluid-Structure, Multi-body and Wave-body Interaction/Professor Calisal Honoring Symposium

Submission Number: 155393

Accuracy Improvement of Directional Wave Spectrum Estimation Around Sea-Going Vessel 

The application of digital twin technology, which integrates real-world measurement data with digital design information, is increasingly recognized as essential for effective structural integrity management. Given the limitations in onboard sensor installation, this study focuses on the inverse estimation of the directional wave spectrum using integrated design and measurement data, providing a foundation for accurately estimating local structural responses across the vessel. This integration helps to align theoretical design expectations with actual operational performance, improving the accuracy of structural response assessments.

The directional wave spectrum is estimated by solving a quadratic programming problem that minimizes discrepancies between the estimated and measured response spectra. To ensure smoothness and continuity in the estimated spectrum, a cubic B-spline surface was applied, with regularization terms incorporated to suppress fluctuations throughout the estimation process in specific regions. To address the integral singularity arising in the encounter-absolute frequency conversion relationship due to the Doppler effect, adaptive quadrature was employed.

To validate the proposed methodology, pseudo-measurement data generated from the wave spectrum and Response Amplitude Operator (RAO) of a 13,000 TEU container vessel are utilized. Based on these pseudo-measurements, the directional wave spectrum is estimated. Subsequently, the RAO and estimated wave spectrum are combined to estimate the response spectrum at locations without sensors, demonstrating the robustness and accuracy of the method.

Presenting Author: Jae-Hyeon Son Multidisciplinary Structural Mechanics Laboratory, INHA University

Presenting Author Biography: Jae-Hyeon Son is a Ph.D. candidate in Naval Architecture and Ocean Engineering.
His research focuses on the structural integrity of vessels, fatigue analysis in marine environments, and advanced methods for estimating directional wave spectrum.