Browsing by Author "Dağli B.Y."

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    Behaviour of large cylindrical offshore structures subjected to Wave loads
    (UIKTEN - Association for Information Communication Technology Education and Science, 2017) Dağli B.Y.; Yiğit M.E.; Gökkuş U.
    Spar-type and monopole substructures consisting of a large-diameter, single vertical cylinders have been used as wind turbine towers, oil storage platforms, tankers and wave energy converters at deepwater region in the sea. These towers and platforms are exposed to environmental forces such as wind, wave and current. Wave force is the most effective force in the total environmental force. The body disturbs the incident wave and Diffraction Theory is used for computing the pressure distribution for designing the structure. Therefore, this study aims to present the effect of structural design of towers on dynamic behavior due to wave actions. Two different cases of structural models are selected to employ bidirectional fluid structure interaction (FSI) analysis. Diffraction Theory is utilized to investigate wave forces. Solid and fluid domains are modeled in Abaqus finite elements program. Behaviors of various types of offshore structures are evaluated and compared according to the significant stresses and displacements. The hydrodynamic pressure on the cylindrical structure surface and the diffraction forces acting on structures are presented. Mode shapes, first three natural frequencies are comparatively given. © 2017 Begüm Yurdanur Dağli, Muhammed Ensar Yiğit, ümit Gökkuş.
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    Evaluation of the technical feasibility aspects of the fishing structures: a case study of Izmir coast
    (Yildiz Technical University, 2023) Dağli B.Y.; Yildirim Uncu D.; Gökkuş Ü.
    This paper was conducted by considering 28 fishing structures in Izmir Coast based on three aspects: inter relation with the fishing ground, technical a spects a nd m arket accessibility to determine technical requirements about infrastructure and superstructure facilities. The questionnaires and personal interviews with the main stakeholders were utilized to determine current situation of the fishing structures. The field observation covered the activities such as catch unloading, handling, auction, distribution and marketing of the catching fish. The data of fishing structures were evaluated by using Quality Function Deployment (QFD) Method. 13 customer requests and 19 technical requirements were considered for designing House of Quality (HoQ) matrix consisting of 7 sections. A mathematical model represented the relationship between fishing structure and boats was obtained by using Queuing Theory. The suitability of the model with Poisson arrival distribution and negative exponential service time distribution was checked using Chi-Square goodness of fit test. In the conclusion, the most important technical criteria were discussed. The features were identified wh ic h ne ed to be improved most. Copyright 2021, Yıldız Technical University.