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회전로터 및 후류 동하중을 고려한 스마트 무인기 천이응답해석
김현정(Kim, Hyun-Jung),오세원(Oh, Se-Won),김성준(Kim, Sung-Jun),최익현(Choi, Ik-Hyeon),김태욱(Kim, Tae-Wook),이상욱(Lee, Sang-Uk),김진원(Kim, Jin-Won),이정진(Lee, Jung-Jin),김동현(Kim, Dong-Hyun) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.9
In this study, structural vibration analyses of a smart unmanned aerial vehicle (UAV) have been conducted considering dynamic loads generated by rotating rotor and wakes. The present UAV (TR-S5-03) finite element model is constructed as a full three-dimensional configuration with different fuel conditions and tilting angles for helicopter, transition and airplane flight modes. Practical computational procedure for modal transient response analysis (MTRA) is established using general purpose finite element method (FEM) and computational fluid dynamics (CFD) technique. The dynamic loads generated by rotating blades in the transient and forward flight conditions are calculated by unsteady CFD technique with sliding mesh concept. As the results of present study, transient structural displacements and accelerations are presented in detail. In addition, vibration characteristics of structural parts and installed equipments are investigated for different fuel conditions and tilting angles.
틸트로터 허브 동하중을 고려한 복합재 스마트 무인기 진동해석
김동현(Kim, Dong-Hyun),정세운(Jung, Se-Un),구교남(Koo, Kyo-Nam),김성준(Kim, Sung-Jun),김성찬(Kim, Sung-Chan),이주영(Lee, Ju-Young),최익현(Choi, Ik-Hyeon),이정진(Lee, Jung-Jin) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.1
In this study, structural vibration analyses of a composite smart unmanned aerial vehicle (UAV) have been conducted considering dynamic hub-loads of tilt-rotor. Practical computational structural dynamics technique based on the finite element method is applied using MSC/NASTRAN. The present smart UAV(TR-S2) structural model is constructed as full 3D configurations with both the helicopter flight mode and the airplane flight mode. Modal based transient response and frequency response analyses are used to efficiently investigate vibration characteristics of structure and installed electronic equipments. It is typically shown that the helicopter flight mode with the 90-deg tilting angle is the most critical case for the induced vibration of installed electronic equipments in the front
틸트로터 허브 동하중을 고려한 복합재 스마트 무인기 진동해석
김동현(Dong-Hyun Kim),정세운(Se-Un Jung),구교남(Kyo-Nam Koo),김성준(Sung-Jun Kim),김성찬(Sung-Chan Kim),김유신(Yu-Shin Kim),최익현(Ik-Hyun Choi),이정진(Jung-Jin Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.10
In this study, structural vibration analyses of a composite smart unmanned aerial vehicle (UAV) have been conducted considering dynamic hub-loads of tilt-rotor. Practical computational structural dynamics technique based on the finite element method is applied using MSC/NASTRAN. The present smart UAV(TR-S2) structural model is constructed as full 3D configurations with both the helicopter flight mode and the aircraft flight mode. Modal based transient response and frequency response analyses are used to efficiently investigate vibration characteristics of structure and installed electronic equipments. It is typically shown that the helicopter flight mode with the 90-deg tilting angle is the most critical case for the induced vibration of installed electronic equipments in the front body of SUAV(TR-S2) model.
기계적 하중 하에서 복합재료 시험편에 접착된 단결정 실리콘태양전지의 성능평가
김종천 ( Jong Cheon Kim ),최익현 ( Ik Heon Choi ),김대현 ( Dae Hyun ),정성균 ( Kim Seong Hyu Cheong ) 한국복합재료학회 2011 Composites research Vol.24 No.6
본 연구에서는 화석에너지 고갈과 환경문제로 인해 새로운 신재생에너지로 주목 받고 있는 태양전지를 대표적인 경량재료인 복합재료에 적용하기 위해 적절한 태양전지 접착 방법에 대한 연구를 진행하였다. 사용된 태양전지는 후면전극 태양전지로 에너지변환 실험실 효율이 약 24.2%인 태양전지를 사용하였다. 하지만, 실리콘계열 태양전지는 재료의 특성상 깨지기 쉽기 때문에 일반적으로 사용되고 있는 동시경화 접착법 대신 접착제를 이용한 이차 접착법을 사용하였다. 접착재료는 태양전지의 충진재 및 접착제로 사용되고 있는 EVA film 과 프리프레그의 수지인 Resin film, 그리고 탄성 접착제를 이용하여 실험을 진행 하였으며, 태양전지가 접착된 복합재료 시험편에 기계적 하중을 부가하여 접착제 종류별 태양전지의 성능변화를 측정하였다. 또한, 기계적 하중 하에서 실시간으로 태양전지의 성능을 평가할 수 있는 측정장치를 설계하여 접착재료별 파단 시점과 특성을 비교?평가 하였다. 파단면분석을 통해 태양전지 효율 감소원인을 분석하여 고찰하였다. 실험결과 태양전지의 접착방법에 따라서 태양전지의 효율이 크게 영향을 받는다는 것을 파악하였다. 또한, 탄성접착제를 사용한 접착 방법이 가장 높은 태양전지 효율 성능을 보여주고 있음을 확인하였다. The objective of this study is to investigate appropriate bonding methods of solar cells in order to apply solar cells, which have been receiving particular attention as a renewable energy due to fossil energy depletion and environment issues, to composite structures. Back-contact solar cells with approximately 24.2% energy conversion efficiency were used in this study. Since silicon-based solar cells are mechanically fragile, the secondary-bonding methods using adhesive were examined in this study. The experiment was conducted with three kinds of bonding materials such as EVA film, Resin film and elastic adhesive. The performance of solar cells for three types of adhesives under mechanical Loading on test specimens is conducted. In addition, the measuring equipment was designed to evaluate the performance of the solar cells under mechanical Loading in real time and the fracture characteristics depending on bonding materials were evaluated. The reason decreasing solar cells efficiency were analyzed and considered by Fractography. The results show that the solar cell performance is largely affected by bonding techniques. Moreover, the bonding method using elastic adhesive shows best solar cell efficiency.
김동현(Dong-Hyun Kim),구교남(Kyo-Nam Koo),이인(In Lee),김성준(Sung-Jun Kim),김성찬(Sung-Chan Kim),이정진(Jung-Jin Lee),최익현(Ik-Hyun Choi) 한국항공우주학회 2004 韓國航空宇宙學會誌 Vol.32 No.6
본 연구에서는 공력 압축성 효과를 고려하여 플랩이 있는 무인기 카나드에 대한 동적 공탄성 해석을 수행하였다. 고려한 해석 모델은 국내에서 개발 후보로 검토된 모델 중 하나 인 CRW(Canard-Rotor-Wing) 무인기의 전운동(all-movable) 카나드이다. 초기 설계 데이터를 기반으로 하여 등가구조 날개 모델을 구성하였다. 엄밀한 공탄성 특성해석을 위해 주파수 및 시간영역 해석기법이 모두 적용되었으며, 카나드 및 플랩 연결부의 회전강성 변화에 대한 매개변수 연구를 수행하였다. 플랩이 있는 전운동 조종면의 경우 각 조종축에서의 등가 회전강성은 공탄성 안정성에 중요한 설계인자이다. 본 연구를 통하여 설계 초기단계에서 동적공탄성 안정성에 미치는 영향을 파악하였으며 관련 해석결과들을 제시하였다. In this study, dynamic aeroelastic analyses of the canard with oscillating flap are conducted considering the effect of aerodynamic compressibility. The canard model considered herein is an all-movable type with a pitching axis on a canard-rotor-wing aircraft which was considered as one of the major UAV candidates under developing in Korea. The equivalent structural model is constructed based on the initial design data by the Korea smart UAV development center. Both the frequency and the time-domain aeroelastic analyses have been applied to practically conduct parametric studies on the effects of equivalent torsional stiffness, In the case of all-movable control surface with oscillating flap, the equivalent rotational stiffness of the pitch axes are important design parameters. The parametric results for the aeroelastic instability are practically presented.
이차접합을 이용한 태양광 발전 비행체 태양전지 접합 기술에 대한 연구
김종천(Jong-Cheon Kim),이용성(Yong-Sung Lee),이진혁(Jin-Hyuk Lee),최익현(Ik-Hyeon Choi),김대현(Dae-hyun Kim),정성균(Seong-Kyun Cheong) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The object of this work was to investigate the solar cell lay down process for solar powered aircraft, especially using the secondary-bonding method. Recently, green technology became one of the core words because of the global shared interest in protecting the environment. Korean government’s new policy is focusing on low carbon and green growth and solar power is one of the best green energy. Nowadays the interests applying green energy to the aerospace industries are highly growing in Korea. Solar powered aircraft is a good example even if it is the beginning stage. Therefore, the attempts were made to determine good methods bonding the solar cell to a composite laminate in this paper.
최익현 ( Choi Ik Hyun ),김면 ( Kim Myun ) 한국디자인트렌드학회 2014 한국디자인포럼 Vol.45 No.-
디자인은 18세기 산업혁명시대 이후 제품에 대한 기능적, 심미적 가치를 제공하는 새로운 분야로 등장하며 우리 인류의 삶의 가치를 증진하고 창출시키는 수단으로 자리매김 해왔다. 21세기로 접어들며 산업은 서로간의 영역이 모호해지고 협업의 필요성이 증대되어 「융합혁명의 시대」로 급속히 전환되어 가고 있으며 디자인주도의 산업패러다임 확산과 창의산업 창출을 위한 디자인의 역할이 더욱 심화되었으며 창조경제가 국가경제의 새로운 활로를 찾기 위해서는 `디자인적 사고(Design Thinking)`로 사람들의 행동·경험 등을 반영하여 제품·서비스를 만들게 함으로써 소비자의 만족을 성취하는 것이 우선적으로 필요하다. 이에 창의산업 창출을 위한 융합 디자인 정책 개발과 추진의 성공 조건으로, 공공부문에서는 그 동안 정부에 의존하는 수직적 구조의 정책추진과 경직된 부처 간 역할을 변화시켜 수평적 구조의 융합을 추진하여야 하며, ICT를 기반으로 한 산업융합을 위해서는 R&D와 디자인분야의 협업이 무엇보다 필요하게 됐다. 이를 위해 디자인융합 R&D시스템의 확산과 이를 운용하기 위한 전문 인력양성은 물론 디자인의 영역을 넓히기 위한 노력으로 서비스디자인, 미래디자인 등 혁신사업 발굴과 함께 디자인을 융합과 성장의 동력으로 이용할 수 있는 디자인클러스터, 통계, 정보, 제도적 마련 등 디자인 인프라 강화가 필수적이며 이를 통해 21세기 융합시대를 선도하는 디자인 강국으로 발돋움할 수 있을 것이다. Design emerged as a new breed of industry adding functional and aesthetic value to products following the Industrial Revolution in the 18th century, and it has become a critical tool to create and improve quality of life for the mankind. As different industries become intertwined and increasingly require collaboration in the 21st century, the industrial paradigm has been rapidly shifting to bring about an “age of convergence revolution" and design has taken on a bigger role in the expansion of the design-driven industrial paradigm and creation of a creative economy. In order to enable the creative economy to make a new breakthrough for the national economy, it is preferentially necessary to incorporate the behavior and experience of consumer`s into goods and services through “design thinking” so that a higher level of satisfaction will be achieved. When it comes to the development and implementation of convergence design policies for the construction of creative industries, the public sector needs to push for horizontal structure-based convergence by making changes in vertical structure-based policy implementation dependent on the government and in inflexible interdepartmental roles. Also, as the condition of success, ICT-based industrial convergence, collaboration between R&D and design needs to be achieved first and foremost. To this end, the expansion of design convergence R&D systems and fostering of professionals who will operate them are necessary. In addition, it is essential not only to create innovative businesses such as service design and future design in order to widen the horizon of design but also to strengthen the design infrastructure in such ways as establishing design clusters, statistics, information and systems that can enable the utilization of design as the driving force behind convergence and growth. All these efforts will allow Korea to make a quantum leap and become a powerhouse in the design industry that leads the convergence age in the 21st century.