Yazar "Baykal, Mehmet Ali" seçeneğine göre listele

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    Comparison of the rules of classification societies (IACS Members) in the area of submersible maneuvering
    (Osman Sağdıç, 2021) Kırıkbaş, Oğuzhan; Bal, Şakir; Baykal, Mehmet Ali
    The Classification Societies find their purpose of existence from the requirement of ensuring safety of merchant activities on seaways. This high-level requirement contains all the safety related aspects of cargo and passenger transportation as well as extraction of resources from seas/under seabed and renewable energy production from wind and waves. The scope of a Classification Society in that high-level requirement is limited on the platform and its systems. A few decades ago, this scope is even more limited and solely consists of activities, which were performed on sea surface. Increasing dependency on the resources under the ocean floor, emergence concept of underwater cargo transportation and developing industry of tourist submarine cruises enlarged this scope. As a consequence of this “underwater” rules were developed by Classification Societies. These rules are mostly the adapted versions of the surface rules. They generally consist of strength, reliability and redundancy of the platform and its systems. However, maneuvering is not directly mentioned in the current versions of the underwater rules. On contrary to the surface vessels maneuvering characteristics can have vital consequences on the safety of underwater vehicle. The reason behind this, is the additional 2-DOF that a submersible has in the vertical plane. This paper is aiming to summarize the current status of the rules on submersible maneuvering of the Classification Societies that are members of IACS (International Association of Classification Societies). Then the existing rules were categorized. A comparison was made between Classification Societies for each of the rule to come out a conclusion about the maturity and commonality level of each category.
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    Design prioritization study for a semi-submersible naval ship based on fast decision method
    (National Defense University Naval Academy Dean's Office, 2024) Karabulut, Utku Cem; Barlas, Barış; Baykal, Mehmet Ali
    Recently, number of countries included various types of special operations crafts to their navies. One type of these crafts is called semi-submersible naval ship, which utilizes superior properties of a submarine and a surface ship. This paper presents general characteristic design features of these type of ships. Additionally, a design prioritization study based on a Fast-Decision survey was carried to determine the importance of different design features of such ships. Survey participants were chosen from experienced naval officers who served the Navy. The responses are analyzed and presented with bar charts which shows the order of importance of the different design parameters. Results reveals that the most important operational tasks for a semi-submersible naval ship are naval special operations capability and ability to infiltrate, dodge and operate in hostile waters while the most important functional features are high maneuverability in surface operations and low acoustic detectability in underwater operations. In addition, it appears that the size of the control room and engine room is more important than the ship's ability to be transported by another vehicle. The authors are intended to make conceptual designs for semi-submersible naval ships and investigate their hydrodynamic features in future studies.
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    Su altı ve su üstünde seyir yapabilen hibrit bir otonom deniz platformunun su altı hidrodinamiğinin incelenmesi
    (Bandırma Onyedi Eylül Üniversitesi, 2025) Karabulut, Utku Cem; Barlas, Barış; Helvacıoğlu, Şebnem; Baykal, Mehmet Ali
    Bu çalışma, su altı ve su üstünde seyir yapabilen hibrit bir yarı dalgıç askeri platformun su altındaki hidrodinamik performansını deneysel ve sayısal yöntemlerle kapsamlı bir şekilde incelemekte, otonom askeri deniz aracı tasarımı alanında katkı sunmayı amaçlamaktadır. Model deneyleri İstanbul Teknik Üniversitesi (İTÜ) Ata Nutku Gemi Model Deney Laboratuvarı'nda gerçekleştirilmiş, hesaplamalı akışkanlar dinamiği (HAD) analizleri ise Star CCM+ yazılımı kullanılarak yürütülmüştür. Çalışmada, su altı direnç deneyleri farklı dalış derinliklerinde ve hızlarda yapılmış, sonuçlar deneysel belirsizlik analizleriyle değerlendirilmiştir. HAD sonuçları, deneysel verilerle karşılaştırılarak doğrulama sağlanmış ve genel olarak %5’in altında farklar elde edilmiştir. Bulgular, su altı performansının dalış derinliğiyle doğrudan ilişkili olduğunu ve yüzeye yakın operasyonlarda hidrodinamik etkilerin arttığını göstermektedir. Bu çalışma, hibrit askeri gemilerin tasarım optimizasyonuna yönelik önemli veriler sunarken, HAD yöntemlerinin bu tür analizlerde etkinliğini de ortaya koymaktadır. Gelecekteki araştırmalar, dinamik manevra kabiliyeti ve çevresel etkilerin değerlendirilmesine odaklanacaktır.