• Title, Summary, Keyword: Infrared signature

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A Comparative Study between Measurement and Prediction Results of a Naval Ship Infrared Signature in the Marine Environment (해상환경에서 함정 적외선 신호 측정 및 예측결과 비교 분석 연구)

  • Kim, Jung-Ho;Yoon, Yoon-Sik
    • Journal of the Society of Naval Architects of Korea
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    • v.48 no.4
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    • pp.336-341
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    • 2011
  • Ship infrared signature is the cause of detection and tracking by infrared sensor and anti-ship missile seeker. Recent warships have been applied the infrared stealth technology to reduce own ship infrared signature and tested to validate own ship infrared signature level. This study describes the two issues. Firstly, we describe the infrared measurement concept and infrared signature level establishment method that have been performed. Secondly, we compare and analyze the error components between the infrared measurement and simulation result.

An Effectiveness Analysis of the Infrared Signature Reduction with Sea Water Cooling according to the Meteorological Environment (해양환경에 따른 해수냉각의 적외선 신호 저감 효과도 분석)

  • Jung, Ho-Seok;Cho, Yong-Jin
    • Journal of the Society of Naval Architects of Korea
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    • v.53 no.6
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    • pp.521-528
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    • 2016
  • The surface of a naval ship emits infrared signature because it is mainly heated by the sun. In order to reduce infrared signature, it has been practiced to cool surface of the naval ship by using sea water. In this study, reduction effect of infrared signature was compared according to the parameters which affect emission of infrared signature in order to increase utility of sea water cooling. The analysis results by searching parameters, which can judge operation of sea water cooling, could be utilized as basic data for operation of the naval ship.

A Study on the Management Methods of the Ship Infrared Signature (함정 적외선 신호의 관리방법 연구)

  • Cho, Yong-Jin
    • Journal of the Society of Naval Architects of Korea
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    • v.50 no.3
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    • pp.182-189
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    • 2013
  • In the development process of new naval ships, it is necessary to make the effort of the signature management and reduction of ship infrared(IR) signature to increase the ship survivability(susceptibility). So far the ship's contrast radiant intensity is used as a ship IR signature design criteria during the naval ship design stages. However, nowaday it is in a state of disorder at the basic design stage because of the lack of any related studies and methods. In this study, the IR signature management methods for improving the signature reduction and ship survivability are suggested by the comparison analysis of the advantages and disadvantages of signature management techniques. And also the criteria for the ship signature management are suggested when considering the infrared signature measuring assets and sea trial environments of the Korean peninsula.

The Study of Solid Propellant to Reduce Infrared Signature (적외선(IR, Infrared) 신호가 감소된 고체추진제 개발)

  • Lee, Jongseop;Yim, Yoojin;Park, Euiyong;Han, Houkseop
    • Journal of Aerospace System Engineering
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    • v.7 no.4
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    • pp.42-48
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    • 2013
  • In this paper, a study of solid rocket propellant formulation is performed to suppress plume and reduce IR(infrared) signature which occurs in propellant combustion. The solid propellant to enhance the stealthy ability was formulated in terms of the kinds and the effects of afterburning suppressant on the ballistic performance and the amount of primary smoke. In addition, substantial decrease in plume and IR signature is confirmed by static firing test by a 4 inch standard motor.

Measurement of Infrared Signature according to the Operating Condition and Location of a Small Scale Engine (축소형 제트 엔진의 구동 조건 및 측정 위치에 따른 적외선 신호 측정 연구)

  • Gu, Bonchan;Jegal, Hyunwook;Baek, Seung Wook;Choi, Seongman;Kim, Won Cheol
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.596-597
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    • 2017
  • In this study, the measurements of infrared (IR) signature were carried out using a small scale engine with the variation of the engine performance and target positions in the exhaust plume. The operating conditions of the engine were kept constant for each test, and the measured positions were sapced at refular intervals from the nozzle exit. The measured IR signature was calibrated by using a blackbody. The results of infrared signature measurements are shown in three bands for analysis of spectral characteristics. As the engine performance decreased and the distance from the nozzle exit increased, the IR signature decreased and the level of decrease varied according to the bands.

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Infrared Signature Analysis of the Aircraft Exhaust Plume with Radiation Database (복사 데이터베이스를 활용한 항공기 배기 플룸 IR 신호 해석)

  • Cho, Pyung Ki;Gu, Bonchan;Baek, Seung Wook;Kim, Won Cheol
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.44 no.7
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    • pp.568-575
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    • 2016
  • For the combat survivability, an infrared signature emitted from aircraft is needed to be predicted and analyzed. In this study, we studied the infrared signature from the exhaust plume from the viewpoint of Infrared(IR) detector. The Line-By-Line method using the radiation database is used for radiative property, and radiative intensity analysis is conducted along 1-D line of sight based on the radiative property. The numerical thermo-fluid field for the plume is conducted by ANSYS FLUENT, while setting the lines of sight having the different detection angle on the thermo-fluid field. We found the high IR signature on the line of sight passing through the locally high temperature region of the plume inside, and the strongest signature from the line of sight toward the nozzle surface. Based on this, it confirms the influence of the surface radiative emission on the infrared signature.

Spectral Infrared Signature Analysis of the Aircraft Exhaust Plume (항공기 배기 플룸의 파장별 IR 신호 해석)

  • Gu, Bonchan;Baek, Seung Wook;Yi, Kyung Joo;Kim, Man Young;Kim, Won Cheol
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.42 no.8
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    • pp.640-647
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    • 2014
  • Infrared signature of aircraft exhaust plume is the critical factor for aircraft survivability. To improve the military aircraft survivability, the accurate prediction of infrared signature for the propulsion system is needed. The numerical analysis of thermal fluid field for nozzle inflow, free stream flow, and plume region is conducted by using the in-house code. Weighted Sum of Gray Gases Model based on Narrow Band with regrouping is adopted to calculate the spectral infrared signature emitted from aircraft exhaust plume. The accuracy and reliability of the developed code are validated in the one-dimensional band model. It is found that the infrared radiant intensity is relatively more strong in the plume through the analysis, the results show the different characteristic of the spectral infrared signature along the temperature, the partial pressure, and the species distribution. The continuous spectral radiant intensity is shown near the nozzle exit due to the emission from the nozzle wall.

Study on Effectiveness of Ocean Meteorological Variables through Sensitivity Analysis of Ship Infrared Signature (함정 적외선신호 민감도 해석을 통한 기상변수 영향에 관한 연구)

  • Cho, Yong-Jin;Jung, Ho-Seok
    • Journal of Ocean Engineering and Technology
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    • v.27 no.3
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    • pp.36-42
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    • 2013
  • According to a study on improving ship survivability, an IR signature represents the contrast radiance intensity between the radiation signature from a ship and the background signature. It was found from applying stealth techniques to the process of ship development that the IR signature is remarkably sensitive and dependent on the environment. In this study, marine climate data for the sea near the Korean Peninsula were collected, and the marine meteorological environment in Korean waters was defined. Based on this data, a study on the sensitivity of the IR signature of target objects was performed using analytical methods. The results of the research indicated that clouds have important effects on the infrared signature, but the velocity of the wind and the humidity have only slight effects on the IR signature. In addition, the air and seawater temperatures had hardly any effect on the IR signature, but it is judged that additional study is needed.

Computational Investigation of the Effect of Various Flight Conditions on Plume Infrared Signature (항공기 비행환경에 따른 플룸 IR 신호 영향성 연구)

  • Kim, Joon-Young;Chun, Soo-Hwan;Myong, Rho-Shin;Kim, Won-Cheol
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.41 no.3
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    • pp.185-193
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    • 2013
  • The plume infrared signature effects at various flight conditions of aircraft were investigated for the purpose of reducing infrared signature level. The nozzle of a virtual subsonic unmanned combat aerial vehicle was designed through a performance analysis. Nozzle and associated plume flowfields were first analyzed using a density-based CFD code and plume IR signature was then calculated on the basis of the narrow-band model. Finally, qualitative information for the plume infrared signature characteristics was obtained through the analysis of the IR signature effects at various flight conditions.

Numerical and Experimental Study on Infrared Signature of Solid Rocket Motor (고체로켓모터의 적외선 신호에 관한 수치적·실험적 연구)

  • Kim, Sangmin;Kim, Mintaek;Song, Soonho;Baek, Gookhyun;Yoon, Woongsup
    • Journal of the Korean Society of Propulsion Engineers
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    • v.18 no.5
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    • pp.62-69
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    • 2014
  • Infrared signature of rocket plume plays an important role for detection, recognition, tracking and minimzing for low observability. Infrared signatures of rocket plume with reduced smoke propellant and smokeless propellant are measured. In order to estimate the infrared signature of rocket plume, CFD analysis for flow structure of plume is performed, and layered integration method for estimating of infrared signature is used. Numerical and experimental results were in good agreement. Both propellants had similar infrared signature. Strong peak at $4.3{\mu}m$ region in the experimental results is appeared due to experimental error arising from the calibration procedure.