• Title/Summary/Keyword: 함정설계

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A Study on the Reliability Analysis of Anti-ship missile using Field Data (야전 운용자료를 이용한 대함유도탄의 신뢰도 분석 연구)

  • Kim, Seok-Kon;Wang, Young-Jin;Kim, Yong-Jin;Kim, Sung-Ouk;Lee, In-Hyun;Lee, Key-Seo
    • The Journal of the Korea institute of electronic communication sciences
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    • v.6 no.6
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    • pp.881-887
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    • 2011
  • In this paper, age exploration of ${\bigcirc}{\bigcirc}$ anti-ship missiles which were deployed on RoKN ships were analysed using parametric estimation method. Additionally, Life distribution and failure pattern of ${\bigcirc}{\bigcirc}$ anti-ship missile were analysed by using field data such as collected inspection, fail, maintenance record for 6 years. Storage failure and MTBF of missile and components were analysed by using reliability analysis s/w Weibull++ v7. The results were compared with maintenance policy including periodic inspection and MTBF which were analysed during development phase. Finally, the suggested methodology using field data analysis of oo anti-ship missile will be applied on re-estabilishment of maintenance policy of ${\bigcirc}{\bigcirc}$ anti-ship missile for TLCSM(Total Life Cost System Management) effectively.

Development of UHF Band antenna for Integrated Communication (통합마스트 통합통신용 UHF 대역 안테나 개발)

  • Jung, Kwang-Sik;Lee, Jong-Hak;Kim, Young-Wan;Ra, Young-Eun;Jeon, Jung-Ik
    • Journal of IKEEE
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    • v.24 no.2
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    • pp.453-460
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    • 2020
  • This paper, UHF band integrated communication antenna for ship communication is designed as a flat type that can be mounted on the integrated mast among integrated communication antennas such as integrated communication, ship communication, broadcasting, and telephone of the ship. The unified mast mounted antenna is an integrated communication antenna applied to the Navy's KDDX, which is an optimized type of integrated communication antenna including a 'composite slope' structure including operational capability, survivability, and improved operability and maintainability. The existing rotary radar and a plurality of monopole-type communication antennas were changed from an irregularly attached shape to the mast exterior to an integrated mast shape including a flat-type integrated communication antenna. the radar reflection area index (RCS) is significantly lowered and compared to overseas products. The goal is to develop a gain broadband antenna.

A Study on the effect of electromagnetic interference in adjacent antenna apertures of multi-function radar for Integrated MAST (통합마스트용 다기능위상배열 레이다의 인접 안테나 개구면 전자파 간섭 영향성 연구)

  • Jung, Chae-Hyun;Ryu, Seong-Hyun;Lee, Hang-Soo;Han, Jae-Sub;Kim, Young-Wan;Kang, Yeon-Duk
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.20 no.2
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    • pp.117-122
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    • 2020
  • In this paper, we study the electromagnetic interference in adjacent antenna aperture of multi-function radar for Integrated MAST of naval ship, which is operating plural radars, with test result of two different X-band antennas. Two antennas is placed in the test fixture copying the part of Integrated MAST for the experiment. The test figure is modeled to see the electromagnetic interference when antenna beam is steered by using electromagnetic analysis tool. Also, 6 test scenarios is determined to verify experimentally and each test scenario is run in an anechoic chamber. At the test antenna #1 radiates a pulse signal and the signal from the antenna #2 is stored and analyzed in the optic data format through a receiving device. Based on the result, the effect of electromagnetic interference is suggested when multi-function radars in the Integrated MAST are operating in adjacent distance.

Range Error of Monopulse Radar according to the Engagement Angle of Cross-Eye Jammer (크로스아이 재머의 조우각에 따른 모노펄스 레이다의 거리 오차)

  • Lim, Joong-Soo;Chae, Gyoo-Soo
    • Journal of Convergence for Information Technology
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    • v.10 no.5
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    • pp.30-35
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    • 2020
  • In this paper, we analyzed the tracking error for the monopulse radar by controlling the phase difference, amplitude ratio and engagement angle of the cross-eye jammer. Cross-eye jamming is an important jamming method for monopulse radars, which causes a displacement in the radar receiving antenna input and misleads the radar's tracking angle. As a result of analyzing the tracking distance error of the radar while changing the engagement angle between the monopulse radar and jammer, the maximum distance error occurs when the engagement angle is 0° and the phase difference is 180°. It was confirmed that the error decreased to 70% or less of the maximum distance error into 45°~135°. In order to increase the efficiency of jammers, it is necessary to study rotary jammers or multi-channel jammers. This study will be very useful for the design of cross-eye jammers for aircraft and ships.

Analysis of the Monopulse Radar Tracking Errors using Orthogonally Deployed Antenna Sets for Cross-eye Jamming (십자형으로 배치된 크로스아이 재머 안테나를 이용한 모노펄스 레이다 재밍 오차 분석)

  • Lim, Joong-Soo;Chae, Gyoo-Soo
    • Journal of Convergence for Information Technology
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    • v.10 no.6
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    • pp.14-18
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    • 2020
  • In this paper, when two sets of cross-eye jammer antennas are installed vertically to jam a monopulse radar, the jamming effects according to the jammer's phase difference, amplitude ratio, and radar angle of engagement are analyzed. The phase difference and amplitude ratio of the cross-eye jammer can be adjusted in the jammer, but since the angle of engagement is relatively determined by the radar, it is very important to respond to changes in the angle of engagement. The orthogonally deployed jammer antennas can be considered as a good way to increase the jamming effect while minimizing the hardware configuration, and the jamming effect is analyzed while changing the angle of inclination from 0° to 360°. This jammer greatly improves the jamming effects at the angles of incidence 45°~135° and 225°~315°, compared to a single jammer. And it is expected to be useful in the design of cross-eye jammers for military aircraft and ships.

An Implementation of Real-Time SONAR Signal Display System using the FPGA Embedded Processor System (FPGA 임베디드 프로세서 시스템을 사용한 실시간 SONAR 선호 디스플레이 시스템의 구현)

  • Kim, Dong-Jin;Kim, Dae-Woong;Park, Young-Seak
    • Journal of the Institute of Convergence Signal Processing
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    • v.12 no.4
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    • pp.315-321
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    • 2011
  • The CRT monitor display system for SONAR signal that are commonly used in ships or naval vessels uses vector scanning method. Therefore the processing circuits of the system is complex. Also because production had been shut down, the supply of parts is difficult as well as high-cost. FPGA -based embedded processor system is flexible to adapting to various applications because it makes simple processing circuits and its core is easily reconfigurable, and provides high speed performance in low-cost. In this paper, we describe an implementation of SONAR signal LCD display system using the FPGA embedded processor system to overcome some weakness of existing CRT system. By changing X-Y Deflection and CRT control blocks of current system into FPGA embedded processor system, our system provides the simplicity, flexibility and low-cost of system configuration, and also real-time acquisition and display of SONAR signal.

Development of Beam-to-Column Connection Details with Horizontal Stiffeners in Weak Axis of H-shape Column (수평스티프너를 이용한 철골 기둥-보 약축접합부 상세 개발에 관한 연구)

  • Lee, Do Hyung;Ham, Jeong Tae;Kim, Sung Bae;Kim, Young Ho;Kim, Sang Seup
    • Journal of Korean Society of Steel Construction
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    • v.16 no.5 s.72
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    • pp.641-652
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    • 2004
  • The strong beam-to-column axis connections in steel structures have been studied for a long time to develop the strength and resistance of the connections. There have been very few studies, however, related to weak axis connections. Domestically, the bracket-type connection is commonly used in weak axis connections to elevate the efficiency of the constructions when the steel structures are constructed. The bracket-type connection detail has been applied moderately to weak axis connections. Therefore, the bracket-type connection in weak axis connections might be brittle and over-designed. The results of this study showed that the welding on the web of the column and the beam was unnecessary. In addition, this study confirmed that the new weak axis connection proposed in this study was superior to the previous connection in terms of strength and ductility.

PID controller design based on direct synthesis for set point speed control of gas turbine engine in warships (함정용 가스터빈 엔진의 속도 추종제어를 위한 DS 기반의 PID 제어기 설계)

  • Jong-Phil KIM;Ki-Tak RYU;Sang-Sik LEE;Yun-Hyung LEE
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.59 no.1
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    • pp.55-64
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    • 2023
  • Gas turbine engines are widely used as prime movers of generator and propulsion system in warships. This study addresses the problem of designing a DS-based PID controller for speed control of the LM-2500 gas turbine engine used for propulsion in warships. To this end, we first derive a dynamic model of the LM-2500 using actual sea trail data. Next, the PRC (process reaction curve) method is used to approximate the first-order plus time delay (FOPTD) model, and the DS-based PID controller design technique is proposed according to approximation of the time delay term. The proposed controller conducts set-point tracking simulation using MATLAB (2016b), and evaluates and compares the performance index with the existing control methods. As a result of simulation at each operating point, the proposed controller showed the smallest in %OS, which means that the rpm does not change rapidly. In addition, IAE and IAC were also the smallest, showing the best result in error performance and controller effort.

Transformation from Data Flow Diagram to SysML Diagram (데이터흐름도(DFD)의 SysML 다이어그램으로의 변환에 관한 연구)

  • Yoon, Seok-In;Wang, Ji-Nam
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.11
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    • pp.5827-5833
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    • 2013
  • Due to science and technology evolutions, modern systems are becoming larger and more complex. In developing complex systems, Model-Based Systems Engineering (MBSE), which is approach to reduce complexity, is being introduced and applied to various system domains. However, because of the modeling being made through a variety of languages, there is a problem with communication within the stakeholders and a lack of consistency in the models. In this paper, by investigating the rule explaining the transformation of one of the only traditional diagrams, DFD, to SysML and reusing the formerly built models, we attempt to implement by SysML. Analyzing each diagram's Metamodel and validating the connection of each component through bipartite graph especially suggest an effective transformation rule. Also, by applying to naval-combat system, we confirm efficiency of this study. Establishing the results of this study as basis for conducting further study, we will be able to transform other previous models gained from formerly built system to SysML. In this way, the stakeholder's communication can be improved and we anticipate that the application of SysML will be beneficial to the much efficient MBSE.

Development of TLCSM Based Integrated Architecture for Applying FRACAS to Defense Systems (국방 무기체계 FRACAS 적용을 위한 TLCSM 기반 통합 아키텍처 구축)

  • Jo, Jeong-Ho;Song, Hyeon-Su;Kim, Bo-Hyeon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.1
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    • pp.190-196
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    • 2020
  • FRACAS(Failure Reporting, Analysis and Corrective Action System) has been applied in various industries to improve the reliability of the systems. FRACAS is effective in improving reliability by repeating failure analysis, proper corrective action, and result verification for identified failures. However, FRACAS has many limitations in terms of process, data collection and management to be integrated into the existing development environment. In the domestic defense industry, studies on the development of FRACAS system and process improvement have been conducted to solve the difficulties of applying FRACAS, but most of them are concentrated in the operation/maintenance phase. Since FRACAS should be conducted in consideration of TLCSM(Total Life Cycle System Management), it is necessary to study the reference architecture so that FRACAS can be applied from the early design phase. In this paper, we studied the TLCSM-based integrated architecture considering the system life cycle phases, FRACAS closed-loop process, and FRACAS essentials in order to effectively apply FRACAS throughout the life cycle of defense systems. The proposed architecture was used as a reference model for FRACAS in a shipboard combat system.