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강왕구(Wanggu Kang),김동민(Dong-min Kim),이장연(Jang-yeon Lee),박승신(Seung-sin Park) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Aerostat is tethered airship shaped balloon. 32m aerostat is developed by KARI for ground, sea & air surveilance. It has unique structural design features such as buoyancy, tethered vehicle dynamics, membrane envelope material, electro-optical cable mechanics and ground mooring system. This paper specifically addresses the materials and structural design aspects of pressurized buoyant vehicles for tethered 32m aerostat.
강왕구(Wanggu Kang),김동민(Dong-min Kim),김성욱(Seong-Yuk Kim),박승신(Seung-sin Park) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Tether cable is key component for aerostat system performance. Tether cable connects aerostat and ground mooring equipment, transfer power from ground to aerostat vehicle and transmit communication data between aerostat equipments and mission payload. Tethered aerostats are lighter-than-air aerodynamically shaped balloons for surveillance and many other applications. 32m aerostat can provide a stable platform to mission payloads up to 900m altitude with 300kg weight. Tether cable system should have enough strength and stiffness for tethering and enough electrical capacity and communication bandwidth for aerostat and mission payload operations. Co-axial synthetic cable with optical fiber, electric cable and polymer mechanical cable compound is designed and tested for 32m aerostat. Design requirements and test procedures are defined for each mechanical and electro-optical functions.
강왕구(Kang Wanggu),황인성(Hwang In Seong) 한국항공우주연구원 2011 항공우주산업기술동향 Vol.9 No.2
본 논문에서는 최근 여객기 구조물의 기술발전 동향을 개략적으로 정리하였다. 주 구조물의 재료를 선정하기 위한 기준 항목을 정의하였다. 전기체 수준에서 복합재료의 사용량 증가 트렌드를 정리했다. 금속재료는 용접과 접착에 의한 공정발전과 새로운 합금의 여객기 사용 사례 등을 정리하였으며, 그 배경에 대하여 간략하게 소개하였다. 여객기 동체의 개발 요구도를 정리하였으며, 요구도에 따른 개발사례를 제시하였다. 기존 금속재 동체와 최근의 복합재 동체간의 설계 개념의 차이를 제시하였으며, 사례제시에 따라 각 사례들의 장단점을 언급하였다. 복합재 주익의 발전 동향을 정리하였다. 스킨 패널, 스파, 립 등의 개발 사례를 정리하였으며, 각 사례별 장단점을 분석하였다. 분석된 사례를 바탕으로 리저널 중형 터보프롭의 주 구조물 재료를 제안하였다. In this paper, the technical trend of transport aircraft structure and material technologies are summarized. The selection criteria for major components of airframe are selected and tabulated. The trend of airframe composite usage are summarized. The new aluminum alloy and related manufacturing process are listed for the newly developed under development stage airframes. The development requirements for fuselage and wing are presented. The design concepts of composite and metallic airframes are compared for fuselage and wing. The design details for wing components, such as skin panel, spars, ribs are presented and each concepts’ advantages and draw-backs are discussed. The material concept for regional turboprop airframe is suggested using the discussed results.
부력기구에 탑재된 싸이클로이달 블레이드형 고공풍력 시스템
강왕구(Wanggu Kang),황인성(In Seong Hwang) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
An airborne cycloidal blade wind turbine which is mounted on a balloon is suggested. The operational altitude is around 1km. The efficiency of electric power generation can by maximized by the variable pitch control of cycloidal blade. The wind turbine stay 1km altitude by a balloon. The balloon is filled with buoyant helium gas. The airborne wind turbine is tethered to ground by a tether cable. The tether cable transmit generated electricity to ground. The maximum capacity of power generator is 50kW. Overall weight and size of generator, blade system, balloon and tether cable is calculated. 1-year power generating capacity of the wind turbine generator is estimated using average wind profile of Korea peninsula.
강왕구(Wanggu Kang),이인(In Lee),김동민(Dong-min Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The aerostat dynamic equation of motion has been built including the tether cable dynamic effects. A numerical program to solve the derived equation of motion has been developed. The dynamic motion of the 32m aerostat has been analyzed under discrete gust and continuous turbulence. The aerostat behaviors under discrete gust which represents a deterministic approach for determining design loads for manned aircraft are solved to verify the effect of aerostat mechanical properties on the aerostat dynamic behavior. Continuous turbulences are simulated for each given altitude, translational mean wind velocity and gust intensity. Dynamic behaviors of the 32m aerostat are simulated for each continuous turbulence conditions. Translational and vertical velocity and pitching behavior and tether reaction force are monitored for each simulation.