• Title/Summary/Keyword: Military Helicopter

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A Model of Military Helicopter Pilot Scheduling (군용 헬리콥터 조종사 스케줄링 모형)

  • Kim, Joo An;Lee, Moon Gul
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.43 no.4
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    • pp.150-160
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    • 2020
  • In this paper, we introduce a pilot's scheduling model which is able to maintain and balance their capabilities for each relevant skill level in military helicopter squadron. Flight scheduler has to consider many factors related pilot's flight information and spends a lot of times and efforts for flight planning without scientific process depending on his/her own capability and experience. This model reflected overall characteristics that include pilot's progression by basis monthly and cumulative flight hours, operational recent flight data and quickly find out a pinpoint areas of concern with respect to their mission subjects etc. There also include essential several constraints, such as personnel qualifications, and Army helicopter training policy's constraints such as regulations and guidelines. We presented binary Integer Programming (IP) mathematical formulation for optimization and demonstrated its effectiveness by comparisons of real schedule versus model's solution to several cases experimental scenarios and greedy random simulation model. The model made the schedule in less than 30 minutes, including the data preprocessing process, and the results of the allocation were more equal than the actual one. This makes it possible to reduce the workload of the scheduler and effectively manages the pilot's skills. We expect to set up and improve better flight planning and combat readiness in Korea Army aviation.

A Study on the Positioning of Ice Sensors for Assessing Airworthiness of Military Helicopter (군용헬기 결빙 감항인증 시험을 위한 결빙센서 위치선정에 관한 연구)

  • Kim, Chan Dong;Hur, Jang Wook
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.40 no.8
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    • pp.495-501
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    • 2016
  • The measurement of icing conditions needs to be carried out accurately by the ice detector system of an aircraft. Ice detector systems should be installed in locations not affected by backwash, rotor downwash or moving doors or other equipment. Various analyses were carried out in order to find the proper locations sufficiently far from these interfering effects. In this study, the optimum position of the ice detector was assessed using computer simulation, with respect to different flight modes, flow velocities and the amount and distribution of liquid water around the sensor.

A Study on the Korea Weather Environment for Icing Airworthiness of Military Helicopter (군용헬기 결빙 감항인증을 위한 국내 기상환경에 관한 연구)

  • Hur, Jangwook;Shin, Baekcheon
    • Journal of the Korea Institute of Military Science and Technology
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    • v.17 no.3
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    • pp.304-310
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    • 2014
  • Based on atmosphere weather data by balloon in Osan and Gwangju area, if icing condition occurs in weather environment of altitude range where helicopter is operated was analyzed in quantitative way. Yearly icing occurrence frequency for daytime during recent three years was average 102 days in Osan, average 91 days in Gwangju. Icing weather environment to highly affect operation of helicopter varies a little according to analysis methods but icing intensity at MDT level was calculated in all the methods, and 14.5~38 times was suggested in Osan; 2.5~30 times in Gwangju. Icing at MDT level was calculated in common in all the analysis methods through wide periods such as Jan., Feb., Mar., and Nov. in Osan. In Gwangju, icing at MDT level was suggested focusing on Jan. only. Therefore, military helicopter developed in Korea is required to strive obtaining certificate of airworthiness about icing condition at MDT level for implementation of perfect operational mission and safe operation.

A Study on the Parameters for Icing Airworthiness Flight Tests of Surion Military Helicopter (수리온 군용헬기의 결빙 감항인증 비행시험을 위한 파라미터 고찰)

  • Hur, Jang-Wook;Kim, Chan-Dong;Jang, Jae-Sang
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.43 no.6
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    • pp.526-532
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    • 2015
  • In order to relieve limitation of flight operation under icing condition and verify its operation in adverse weather condition for Surion, military helicopter developed in Korea, airworthiness certification in icing condition is required. The process of Surion icing certification should be considered by implementation of four methods by step such as CFD analysis, simulated flight tests, artificial icing flight tests, and natural icing flight tests. For Surion icing flight tests, these are required 20~30 sorties and 20~23 hours in artificial icing condition; 20~30 sorties and 20~22 hours in natural icing condition. In addition, to proceed with efficient flight tests, it is necessary to implement artificial icing flight tests in LWC $0.5{\sim}1.0g/m^3;$ natural icing flight tests in less than LWC $0.5g/m^3$.

Review on U.S. Army Helicopter Mishap Analysis for Revision of Crashworthiness Requirements (내추락성 요구도 개정을 위한 미 육군 헬기 사고사례 분석 고찰)

  • Hwang, Jungsun;Lee, Sangmok
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.41 no.9
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    • pp.734-739
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    • 2013
  • Representative crashworthiness requirement documents for military helicopter are MIL-STD-1290 and the Aircraft Crash Survival Design Guide(ACSDG) which were lastly revised in the 1980's. Taking analysis results of diverse U.S. Army helicopter mishaps into account, we can say that adequate guidelines do not exist to ensure crashworthiness of new generation aircraft. In this paper, U.S. Army helicopter mishap analysis conducted by U.S. Army Research, Development and Engineering Command(RDECOM) is readjusted to review the basis of new crashworthiness design criteria for military helicopter, in other words, Full Spectrum Crashworthiness Criteria(FSCC). This analysis effort is a part of FSC development. This effort was to research and quantify the dynamics of military aircraft crashes to be used as the quantitative basis for new design criteria.

THE INVESTIGATION FOR UH-60 HOVERING ACOUSTIC NOISE CHARACTERISTIC ANALYSIS BY COMPUTATIONAL AERO-ACOUSTIC METHOD (전산공력소음해석을 통한 UH-60 제자리비행 공력소음 연구)

  • Park, N.E.;Woo, C.H.;Choi, G.M.;Kim, C.H.;Yee, S.J.
    • 한국전산유체공학회:학술대회논문집
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    • 2009.04a
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    • pp.70-74
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    • 2009
  • The helicopter development technology is improved by the increasing of computing power and advanced test facilities. The increasing efficiency of fuel consuming by the developing of improved lift-to-drag rotor system is the major issue, the noise reduction for ecology(civil area) and increase of survivability to reduce noise detection(battlefield) also are important. This investigation shows the helicopter external noise flight test methods, conventional military helicopter's(UH-60) experimental results and the numerical modeling method for aero-acoustic of rotor blade and the result of CAA(Computational Aero-Acoustic) for main rotor blade.

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Current Status of Civil-Military Dual Use Helicopter Development - Focusing on Conversion Case from Military to Civil Helicopter - (민.군 겸용헬기 개발현황 - 군용헬기에서 민수헬기로 전환사례를 중심으로 -)

  • Lee, Jung-Hoon;Chang, Byeong-Hee;Hwang, In-Hee
    • Current Industrial and Technological Trends in Aerospace
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    • v.7 no.1
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    • pp.32-42
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    • 2009
  • Required system and technology for the civil helicopter and the military helicopter are almost similar. A lot of mount helicopters are converted from military to civil, or converted oppositely, or new developed considering civil-military dual use in order to reduce development cost and period. In the case of converting the military to the civil, the military helicopters are developed based on sufficient requiring amount following conversion to the civil helicopters with minor modification. This paper presents the investigation and the analysis for the case and the approach of dual use helicopter development from military helicopters to civil helicopters.

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Analysis of Revised Helicopter Crashworthiness Criteria (개정 헬리콥터 내추락성 설계기준 분석)

  • Hwang, Jungsun;Lee, Sangmok
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.42 no.5
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    • pp.415-422
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    • 2014
  • There has been a lot of discussion to revise military helicopter crashworthiness design criteria. In this paper, newly revised crashworthiness criteria is analyzed centering around the Crashworthiness Index which is the core content of revised criteria. The Crashworthiness Index(CI) was conceived as an adequate method to quantify the crashworthiness capabilities of a rotorcraft design. The index can rate how well a new or derivative design complies with design requirements. The CI rating is made up of seven assessment areas. While the Basic Airframe Crashworthiness(BAC) area tends to be an objective calculation, other areas of the CI tend to be more subjective. Therefore, in this paper, detail CI calculation process for the BAC area is analyzed to inspect the effectiveness of revised criteria.

Design Improvement of Vent System for Korean Utility Helicopter's Anti-Explosion Fuel Tank (한국형 기동헬기 내폭발성 만족을 위한 연료 벤트 시스템 설계개선)

  • Kim, Joung-Hun;Kim, Chang-Young;Chang, Joong-Jin;Lee, Mal-Young;Shim, Dai-Sung
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.42 no.1
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    • pp.76-81
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    • 2014
  • Military helicopter is exposed to the enemy gun firing due to the low altitude flight of contour flight, hovering & nap of the Earth flight, therefore it has the high possibility to be exploded by the gun firing. Recently the Anti-ballistic requirement is required to get the high level of safety from gun firing in required operational capability. The first military utility helicopter of SURION has the Anti-ballistic requirement and explosion proof. In order to meet the requirement, OBIGGS is adopted for the first time in KUH. It is proven that Anti-Explosion capability is satisfied to requirement for improving vent system which was insufficiently designed in development period and related to Anti-explosion.