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  1. Home
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Browsing by Publisher "Universidad de Cantabria"

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    A Simulation Study on the Performance of Jacket Type Offshore Structures Using Machine Learning Algorithms
    (Universidad de Cantabria, 2024) Gücüyen E.; Çiftçioğlu A.Ö.; Tuğrul Erdem R.
    In this study, the behaviors of jacket-type offshore structures are numerically investigated. The examined four-legged models with a total height of 60 m have four layers and three different cylindrical element sizes are fixed to the seabed. The structures are under the effect of environmental forces, including wind and wave loads, as well as operational loads. Three different marine environments have been generated in environmental modeling. Thus, the parametric study has been performed using bidirectional fluid-structure interaction (FSI) analyses of 36 models. Structural outputs such as displacement, reaction force, and stress values are determined by numerical analyses. In the second part of the study, the implementation of machine learning algorithms, including Xgboost, Random Forest, and Support Vector regressors, is employed to automate the assessment of performance in jacket-type offshore structures. The evaluation of these machine learning models in predicting the displacement, reaction force, and stress values of offshore jacket structures is conducted, revealing Xgboost as the most promising technique, although with satisfactory overall performance across all algorithms. These findings provide empirical evidence supporting the feasibility and applicability of employing machine learning methodologies in the analysis of performance for jacket-type offshore structures. © SEECMAR | All rights reserved.
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    Numerical analyses of underwater pipe sections under falling objects
    (Universidad de Cantabria, 2024) Gücüyen E.; Erdem R.T.
    Underwater and land pipelines are generally modelled under the environmental loads. In addition to these mentioned loads, pipelines are subjected to destructive sudden loads due to accidental drops, ship anchors, rock falls, trawlers fishing and military attacks. In this study, numeric analysis of the same pipe section has been carried out according to the sudden loads caused by falling objects both underwater and on land. Abaqus finite elements analysis software is used in the analysis. While the interaction of pipe-falling object is modelled in the analysis of the pipeline on land, the interaction of pipe-falling object-water is modelled in the underwater pipeline. Bidirectional fluid-structure interaction (FSI) analysis is utilized in the water-pipe-falling object interaction modelling. A fully nonlinear free surface simulation is performed by Coupled Eulerian Lagrangian (CEL) technique in the FSI analysis. Impact parameters such as accelerations, velocities, displacements and impact forces, are determined for both land and underwater pipe sections at the end. Thus, while determining the effect of water on the impact behaviour, the free surface movement of the water in the course of impact is also obtained. © SEECMAR | All rights reserved.

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