Design Optimization of a Tension Leg Platform for Floating Offshore Wind Turbine Based on NSGA-II Algorithm With Surrogate Models
Abstract This study performs the optimization of a tension leg platform for a floating offshore wind turbine (FOWT) to minimize pitch motion and tendon tension responses using time-domain numerical simulations. To achieve this, the nondominated sorting genetic algorithm II (NSGA-II) was employed in combination with surrogate models. The target platform features a central circular column […]
Application of spatiotemporal wave field-based neural network for predicting parametric roll motions
Abstract In this study, the applicability of data-driven machine learning techniques for predicting nonlinear ship motions in a seaway, including parametric roll, is investigated. The proposed neural network model is designed to generate time-series predictions of ship responses several minutes in advance using spatiotemporal wave field data and past motion records as input. To achieve […]
A SHAP value method for ultimate strength prediction of stiffened panel: A data-driven tool in engineering
Abstract This study introduces a technique to derive the primary variables of the empirical formula for predicting the ultimate strength of stiffened panels by utilising the SHAP (SHapley Additive exPlanations) value, which is a means to explain the output of a machine learning model. Existing empirical equations, which can predict the ultimate compressive strength of […]
Experimental and numerical investigation of fracture toughness in the heat-affected zone of FH36 steel for LCO₂ vessels
Abstract With increasing decarbonisation demands, the structural safety of liquefied carbon dioxide (LCO₂) carriers in low-temperature environments has gained attention. Cracks significantly reduce structural service life, and fracture toughness is an essential material property for assessing the crack stability. Cracks tend to form in welded regions due to stress concentration. While some fracture toughness tests […]
Ice fracture behaviours in cavitating waterjet-ice interaction with initial defects in ice
Abstract High-pressure waterjet was validated as an effective auxiliary ice-breaking technique, demonstrating the capacity to induce either global structural failure or localised cutting-induced fracture in ice, depending on application requirements. To investigate the influence of defects on jet-induced ice fragmentation and load-bearing capacity, tailor-made ice specimens containing pre-prepared defects were developed. Systematic experiments analysing Venturi-type […]
Technical recommendations for metallic C(T) and SEN(B) fracture toughness test specimens: Data-driven insights from literature
Abstract The safety assessment of flawed structures is critical to ensuring their reliability and is commonly performed using Engineering Critical Assessment (ECA) or Finite Element Analysis (FEA), both of which rely on experimentally measured fracture toughness. Testing standards provide standardised methods for determining fracture toughness and regulate experimental procedures to ensure accuracy. However, standards mainly […]
Mooring tension estimation for multi-connected floating photovoltaic arrays via LSTM networks
Abstract Accurately estimating mooring‑line tension is essential for the safe operation of large, multiconnected floating‑photovoltaic (FPV) arrays, yet installing load cells on every line is impractical. This study develops and evaluates data‑driven tension estimators that use only motion responses generated from time‑domain hydrodynamic simulations. A long short‑term memory (LSTM) network trained on displacements provides the […]
Engineering Critical Assessment of IMO Type C Tanks: A Comparative Study of Shell and Solid Element Models
Abstract In the present study, an Engineering Critical Assessment (ECA) is conducted for an International Maritime Organisation (IMO) Type C liquefied CO2 (LCO2) cargo tank to evaluate the effect of finite element configuration on structural integrity in the presence of potential flaws. With the increasing demand for LCO2 carriers to support carbon capture, utilisation, and storage (CCUS), […]
Ice damage characteristics under high-pressure water jet based on Johnson–Holmquist II brittle constitutive model
Abstract High-pressure water jet technology, as a novel auxiliary ice-breaking method, demonstrated advantages in directional accuracy and environmentally friendly characteristics. This study conducted numerical simulations of high-pressure water jet ice-breaking processes using the Johnson–Holmquist II (JH-2) brittle ice constitutive model and arbitrary Lagrangian–Eulerian finite element method two-way coupling method, with model validity confirmed through comparisons […]
Integrated heating line selection for line heating using principal strain field and curvature
Abstract This study proposes a novel strategy for determining optimal heating line positions on doubly curved ship plates, aiming to overcome the limitations of existing automation techniques. Most automated approaches rely on principal strain fields to guide the orientation of heating lines, typically placing lines perpendicular to the principal direction. However, these methods often lack […]
