• Title/Summary/Keyword: 함정시험평가서

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Emission Prediction from Naval Ship Main Propulsive Diesel Engine under Steady Navigation (정속항해 시 함정 주 추진 디젤엔진의 배기가스 배출량 예측)

  • Lee, Hyung-Min;Park, Rang-Eun
    • Journal of Advanced Marine Engineering and Technology
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    • v.36 no.6
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    • pp.788-793
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    • 2012
  • This study was focused on the estimations of air pollutants, such as PM(Particulate matters), SOx(Sulfur Oxides), $CO_2$(Carbon diOxides) and NOx(Nitrogen Oxides), from a diesel propulsion engine installed on a naval vessel. Legislative and regulatory actions for exhaust emissions from ships are being strengthened in international communities and national governments to protect human health and the environment. In this context, various technologies have been developed from all of the nations of the world to meet strict standards. These regulations are based on commercial ship applications and according to size, but are not suitable for military naval vessels, which have much different engine operating conditions and hull architectures. Additionally, there is no international emission control system for military ships. Emission factors have been updated for commercial ship types from work at various research institutes; however, it is difficult to develop emission factors for military vessels because of their characteristics. In this paper, exhaust emissions from diesel engines installed on naval vessels under steady navigation condition were estimated with emission inventory methodology applied to ocean going vessels using fuel-based methods and fuel sulfur content analysis.

A Study on Efficient Test & Evaluation Methods in Naval Ship Acquisitions (함정사업 시험평가의 효율적 수행방안에 관한 연구)

  • Kim, Jaeyong;Choi, Woensug;Hong, Sukyoon;Chung, Hyungyun;Song, Jeehun;Im, Wooseok;Kwon, Hyunwung
    • Journal of the Korea Institute of Military Science and Technology
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    • v.19 no.6
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    • pp.703-711
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    • 2016
  • The purposes of this study is to identify the problems arising from current Test & Evaluation process of the naval ship acquisition program and to suggest methods to increase the acquisition efficiency. Considering that the present rule of developmental test &evaluation(DT&E) and operational test & evaluation(OT&E) has caused an inefficiency effect on the acquisition procedures due to the limited practices on it, the DT&E and OT&E procedures through test & evaluation master plan(TEMP) is proposed based on the selective practices of the defense instruction articles. Also, considering characteristics of naval ship acquisitions, efficient procedure systems are derived through case analysis results by comparing each performances of the system. The suggested methods are able to meet the requirements of the changed acquisition environments and also increase efficiency of acquisition systems by adoption of DT&E and OT&E combined test scheme.

Improvement of Basic Design Process for Submarines by Integration of SE-Based Technical Review and Requirements Management Process (SE 기반 기술검토 및 요구사항 관리 프로세스의 통합을 통한 잠수함 기본설계 프로세스의 개선)

  • Shin, Sung-Chul;Park, Jin-Won;Lee, Jae-Chon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.11
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    • pp.96-104
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    • 2018
  • Military vessels are complex weapon systems consisting of various integrated onboard equipment. Since their acquisition of military equipment takes a long period of time and a prototype ship is deployed and tested, vessel development has relied on its proprietary process. However, due to the growing complexity of onboard equipment technology, application of systems engineering (SE) process has become indispensable. Nonetheless, an effective design process complementing the existing design with the SE has not yet been developed. As such, we have studied an improved basic design process for submarines based on SE. To do so, we analyzed the processes for the basic design, technical review, and requirement management. Included reviews and requirements are SRR, SFR and PDR, and SSRS, SSS, and SSDD. By combining the results in the SE framework, we built an improved basic design process that can be applied in parallel with the SE-based technical review and requirement management. To assess the process, we applied our proposed model to the submarine development undergoing the basic design phase. It is possible to effectively manage the requirements, design artifacts and improve traceability, and also utilize them as test and evaluation materials. The SE-based basic design process is expected to be useful in other kinds of vessel design.

Effect of nozzle diameter on the reduction of smoke emission from naval ship diesel engines (함정용 디젤엔진의 노즐 직경 변화가 매연 발생에 미치는 영향)

  • Son, Min-Soo;Choi, Jae-Sung;Cho, Kwon-Hae
    • Journal of Advanced Marine Engineering and Technology
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    • v.40 no.3
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    • pp.180-184
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    • 2016
  • Legislative and regulatory actions regarding the exhaust gas from ships are being strengthened by both international organizations and national governments, to protect human health and the environment. Exhaust gas traps are excluded from exhaust gas regulation applications, but, recently, the United States, Britain, and other developed countries have examined a variety of ways to improve the system, including the introduction of electric propulsion systems to prevent air pollution generated by naval ships. This study investigates a large number of smoke problems of naval diesel engines to verify the effect of improving the nozzle characteristics. An exhaust gas emission measurement method to determine the quality of pollutant exhaust gas generated during low-load operation is proposed through the research methodology of the smoke problem. It was confirmed that the emissions value is improved by decreasing the nozzle hole diameter and increasing the injection pressure. At the same time, the flow rate decrease equation and setting up a test memo based on the nozzle diameter confirmed that the fuel consumption, to which the nozzle diameter in the flow path is related, is reduced.

Development of Pressure Correction System for Surface Vessel to Ensure Reliability of Compartment Test Result (수상함 격실기밀시험 결과의 신뢰성 확보를 위한 압력 보정 시스템 개발)

  • Min, Il-Hong;Kim, Jun-Woo;Son, Gi-Joong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.22 no.1
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    • pp.409-414
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    • 2021
  • Tightness performance that blocks compartments is important for surface ships to achieve superior mission performance and survivability in combat environments. To meet the above requirements, airtightness of the structural elements and the appropriate strength to specific areas are checked during a test run after ship construction. In particular, air tests of compartments adjacent to the water surface are performed. In an air test, air is injected into the compartment up to the test pressure of the test memo. The pressure drop value is checked after 10 minutes to determine if the requirements of the corresponding area are satisfied. In summer, however, when the influence of the outside temperature is large, a phenomenon in which the internal pressure increases during the air test was identified. This phenomenon reduces the reliability of the test result. Therefore, a system was designed to compensate for temperature changes in the compartments through this study. The developed system calculates the amount of pressure change caused by a temperature change in the compartment and outputs a correction value. The pressure change was calculated using the ideal gas equation, reflecting the maintenance, increase, and decrease in temperature during the test process. A comparison of the calculated pressure correction value with the database of NIST REFPROP revealed a difference of 0.126% to a maximum of 0.253%.