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.
{"title":"DESIGN PRIORITIZATION STUDY FOR A SEMI-SUBMERSIBLE NAVAL SHIP BASED ON FAST DECISION METHOD","authors":"Utku Cem Karabulut, B. Barlas, Mehmet Ali Baykal","doi":"10.56850/jnse.1406404","DOIUrl":"https://doi.org/10.56850/jnse.1406404","url":null,"abstract":"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.","PeriodicalId":502729,"journal":{"name":"Journal of Naval Sciences and Engineering","volume":"38 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140461467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The structure that transforms a linear polarized signal into right-hand or left-hand circularly polarized signals is called a polarizer. In this study, a dual-band waveguide polarizer used in satellite communications is presented. The waveguide polarizer is designed using iris structures on a square waveguide. The purpose of the polarizer is to transmit the ±45° tilted linearly polarized signal at its input to the output as a right-hand or left-hand circularly polarized wave, and vice versa. At the input of the polarizer, a transition is designed between the WR42 waveguide and the square waveguide. At the output stage, a transition from square waveguide to circular waveguide is designed. In this paper, the design steps of both the polarizer and the transition sections, the optimization parameters, and simulation results are presented in full detail. The simulations are performed with a commercial electromagnetic simulation software, CST Studio Suite. The design operates within the Ka-band, specifically at 17.2 – 21.2 GHz and 27.5 – 31 GHz frequency bands. The insertion loss of the iris polarizer is 23 dB, and the phase difference is less than 15° around 90° for both bands.
将线性极化信号转换为右旋或左旋圆极化信号的结构称为偏振器。本研究介绍了一种用于卫星通信的双波段波导偏振器。该波导偏振器采用方形波导上的光圈结构设计而成。偏振器的目的是将其输入端的 ±45° 倾斜线性偏振信号以右手或左手圆极化波的形式传输到输出端，反之亦然。在偏振器的输入端，设计了 WR42 波导和方波导之间的过渡。在输出级，设计了从方波导到圆波导的过渡。本文详细介绍了偏振器和过渡部分的设计步骤、优化参数和仿真结果。仿真使用商业电磁仿真软件 CST Studio Suite 进行。该设计在 Ka 波段内工作，特别是在 17.2 - 21.2 GHz 和 27.5 - 31 GHz 频段。虹膜偏振器的插入损耗为 23 dB，两个频段 90° 附近的相位差均小于 15°。
{"title":"ÇİFT-BANT İRİS POLARİZÖR TASARIM VE OPTİMİZASYONU","authors":"Merve Güvenç, İsmail Şi̇şman, A. A. Ergin","doi":"10.56850/jnse.1390404","DOIUrl":"https://doi.org/10.56850/jnse.1390404","url":null,"abstract":"The structure that transforms a linear polarized signal into right-hand or left-hand circularly polarized signals is called a polarizer. In this study, a dual-band waveguide polarizer used in satellite communications is presented. The waveguide polarizer is designed using iris structures on a square waveguide. The purpose of the polarizer is to transmit the ±45° tilted linearly polarized signal at its input to the output as a right-hand or left-hand circularly polarized wave, and vice versa. At the input of the polarizer, a transition is designed between the WR42 waveguide and the square waveguide. At the output stage, a transition from square waveguide to circular waveguide is designed. In this paper, the design steps of both the polarizer and the transition sections, the optimization parameters, and simulation results are presented in full detail. The simulations are performed with a commercial electromagnetic simulation software, CST Studio Suite. The design operates within the Ka-band, specifically at 17.2 – 21.2 GHz and 27.5 – 31 GHz frequency bands. The insertion loss of the iris polarizer is 23 dB, and the phase difference is less than 15° around 90° for both bands.","PeriodicalId":502729,"journal":{"name":"Journal of Naval Sciences and Engineering","volume":"14 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139163000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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