• 제목/요약/키워드: aircraft conceptual design

검색결과 67건 처리시간 0.021초

A Tailless UAV Multidisciplinary Design Optimization Using Global Variable Fidelity Modeling

  • Tyan, Maxim;Nguyen, Nhu Van;Lee, Jae-Woo
    • International Journal of Aeronautical and Space Sciences
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    • 제18권4호
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    • pp.662-674
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    • 2017
  • This paper describes the multidisciplinary design optimization (MDO) process of a tailless unmanned combat aerial vehicle (UCAV) using global variable fidelity aerodynamic analysis. The developed tailless UAV design framework combines multiple disciplines that are based on low-fidelity and empirical analysis methods. An automated high-fidelity aerodynamic analysis is efficiently integrated into the MDO framework. Global variable fidelity modeling algorithm manages the use of the high-fidelity analysis to enhance the overall accuracy of the MDO by providing the initial sampling of the design space with iterative refinement of the approximation model in the neighborhood of the optimum solution. A design formulation was established considering a specific aerodynamic, stability and control design features of a tailless aircraft configuration with a UCAV specific mission profile. Design optimization problems with low-fidelity and variable fidelity analyses were successfully solved. The objective function improvement is 14.5% and 15.9% with low and variable fidelity optimization respectively. Results also indicate that low-fidelity analysis overestimates the value of lift-to-drag ratio by 3-5%, while the variable fidelity results are equal to the high-fidelity analysis results by algorithm definition.

항공기 복합재 날개구조 전단흐름 해석 (Shear Flow Analysis of Aircraft Composite Wing Structure)

  • 최익현;김성찬;김성준
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2004년도 춘계학술발표대회 논문집
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    • pp.75-78
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    • 2004
  • Traditionally aluminum alloy have been used in manufacturing of aircraft structures, and semi-monocoque structural concept have been mainly applied in structural design of fuselage and wing. However, recently monocoque structural concept is applied in many small-size aircraft structures manufactured with composite materials. In such case appling monocoque structural concept, in initial conceptual design stage on wing, it is not easy to analyze shear flow using classical shear flow analytical method because composite skin structure can support span-wise tension/compression stress as well as sectional shear stress. In this study, an extended shear-flow analytical method to apply to composite monocoque structural concept was developed through extending the classical shear-flow analytical method.

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서울대학교 인간동력항공기의 설계 및 제작 (SNU Human Powered Aircraft Design and Manufacturing)

  • 은원종;김정헌;박성우;강정표;김태환;박재현;한유리;이다운;홍종화;이윤혁;최한슬;박지은;박중현;이우희;장범찬;신상준
    • 항공우주기술
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    • 제12권2호
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    • pp.230-240
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    • 2013
  • 오로지 인간의 동력만을 이용하여 비행하는 것을 목표로 하는 인간동력 항공기에는 다양한 역학적인 도전요소가 다분하다. 엔진과 비교하여 매우 낮은 동력을 사용하는 인간동력 항공기는 중량과 재료, 공력과 구조 분야의 분석 등이 고려되어야 한다. 또한 항공기가 매우 낮은 속도에서 비행하므로 저속비행에서의 공력 특성을 파악하여야 한다. 서울대학교 인간동력 항공기에서는 이러한 요소들을 만족시키기 위하여 기존의 인간동력 항공기의 비교와 더불어 역학적인 분석을 통하여 설계변수들을 계산하고 설계를 제안하였다. 더불어 복합재를 사용하여 실재 인간동력항공기를 제작하는데 필요한 절차에 대하여 논의하였다.

한국형기동헬기(KUH) 설계개발과정 개관 (The Overview of the Design and Development Process of the Indigenous Korean Utility Helicopter (KUH))

  • 윤희권;오상철;정상원;양준호
    • 항공우주시스템공학회지
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    • 제2권3호
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    • pp.29-32
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    • 2008
  • The overview of KUH design and development process is presented according to Buede's systems and development "vee" model. The system decomposition and integration activities exemplify KUH specification tree, design maturity and analysis according to design stage(conceptual, preliminary, and detail design), scheduled work breakdown structure, qualification test, ground test, and flight test. This process can be applied to the development of a new aircraft.

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Conceptual design of hybrid electric vertical take-off and landing (eVTOL) aircraft with a liquid hydrogen fuel tank

  • Kim, Jinwook;Kwon, Dohoon;Jeong, Sangkwon
    • 한국초전도ㆍ저온공학회논문지
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    • 제24권2호
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    • pp.27-38
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    • 2022
  • Urban air mobility (UAM) has recently attracted lots of attention as a solution to urban centralization and global warming. Electric vertical take-off and landing (eVTOL) is a concept that emerges as one of the promising and clean technologies for UAM. There are two difficult challenges for eVTOL aircraft to solve. One is how to improve the weight efficiency of aircraft, and the other is how to complete long-range missions for UAM's flight scenarios. To approach these challenges, we propose a consolidated concept design of battery-fuel cell hybrid tiltrotor aircraft with a liquid hydrogen (LH2) fuel tank. The efficiency of a battery-fuel cell hybrid powertrain system on the designed eVTOL aircraft is compared to that of a battery-only powertrain system. This paper shows how much payload can increase and the flight scenario can be improved by hybridizing the battery and fuel cell and presenting a detailed concept of a cryogenic storage tank for LH2.

설계변수의 불확실성을 고려한 미익 하중의 확률론적 해석 (Probabilistic Load Analysis for Tailplane Considering Uncertainties in Design Variables)

  • 최용준;김인걸;이석제
    • 한국군사과학기술학회지
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    • 제13권6호
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    • pp.1043-1050
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    • 2010
  • This paper examined the probabilistic load analysis for the tailplane during pitching maneuvering in the conceptual aircraft design phase. The flight load analysis based on the probabilistic distribution of design variables are compared with the results of the deterministic analysis. Two forms of variable distribution are used in this paper. One is standard normal distribution, the other distribution is calculated from the results of short-period longitudinal equation of aircraft motion. The influence of the distribution parameter on the probabilistic load analysis was investigated and the significant design variables that have an impact on the mean and variance of probabilistic load were identified. The comparison indicates that probabilistic load analysis provides more reliable probabilistic load distribution for the structural design than the traditional deterministic analysis.

전기로 추진되는 일반 프로펠러 항공기의 초기 사이징 (Initial Sizing of General Aviation Aircraft Propelled by Electric Propulsion system)

  • 한혜선;신교식;박홍주;황호연;남태우
    • 한국항공우주학회지
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    • 제41권5호
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    • pp.391-403
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    • 2013
  • 전기 추진 프로펠러 항공기는 기존의 제트엔진으로부터 나오는 유해한 배기가스로 인한 환경적 우려와 국가 에너지 안보 차원에서 새로운 관심을 받고 있다. 그러나 전통적인 항공기 사이징 방법들은 여러 종류의 에너지원과 동력 시스템을 사용하는 전기 추진 항공기에 바로 적용될 수 없다. 본 연구에서는 일반화된 동력기반 사이징 기법에 기초한 전기 추진 항공기 사이징의 실제 예를 제시하였다. 여기서 일반 항공기는 프로펠러, 고온초전도모터, 수소가 연료로 사용되는 연료전지, 동력 조절 장치로 구성되는 전기 추진시스템에 의해 구동된다. 기술 향상의 영향을 평가하기 위해 전기 구성품들의 두 가지 다른 기술 구성을 가정하여 항공기 사이징을 수행하였고, 전형적인 형태의 기준 항공기와 사이징 결과를 비교하였다.

경항공모함 이·착함 성능평가 및 안전임무 수행범주 일관 해석 연구 (A Study on Short-Take-Off and Vertical Landing (STOVL) Performance Evaluation of a Light Aircraft Carrier and a Consistent Analysis of Safe Operating Envelope (SOE))

  • 홍사영;박동민;정재환;서민국;조석규
    • 대한조선학회논문집
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    • 제61권2호
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    • pp.125-134
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    • 2024
  • The Safe Operating Envelope (SOE) combined with Short-Take-Off and Vertical Landing (STOVL) performance is an essential consideration of a light aircraft carrier for design of hull shape with excellent seakeeping performance in terms of naval air operations as well as traditional naval ship missions such as Transit and Patrol (TAP), and Replenishment at Sea (RAS) and so on. A variety of procedures are systematically combined to determine SOE considering rather complicated missions associated with operation of aircraft onboard. The evaluation of take-off and landing safety missions onboard should consider wind effect on deck and severer seakeeping indices and standards compared with conventional naval ships. In order to support take-off and landing missions, various support activities of the crews are required. So, additional evaluation is needed for indicators such as MSI(Motion sickness Index) and MII(Motion Induced Interruptions), which are quantitative indicators of work ability that appear as a result of motion response. In this study, a standard procedure is developed including the seaworthiness performance indicators, standards, and evaluation procedures that should be considered during design of STOVL aircraft carrier. Analysis results are discussed in terns of air-wake on deck as well as seakeeping indices associated with design parameter changes in view of conceptual design of a light aircraft carrier.

카나드 형상 고시동 항공기 공력설계를 우한 높은 받음각 정적 안정성 분석 실험 연구 (An Experimental Study on High Angle of Attack Static Stability Analysis For the Aerodynamic Design of Canard Type High Maneuver Aircraft)

  • 정인재
    • 한국항공우주학회지
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    • 제35권7호
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    • pp.575-580
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    • 2007
  • 카나드 형상 고기동 항공기의 개념 설계 단계에서 높은 받음각 항공기 정적 안정성 분석을 위해 저속 소형 풍동시험을 수행하였다. 본 연구에서는 1/50축척의 일반적인 카나드-동체-날개 형상을 소형 풍동시험 모델로 사용하였다. 높은 받음각 비선형특성을 포함한 정적 안정성을 분석하기 위하여 카나드 굽힘에 따른 수직 꼬리 날개 효과를 분석하였다. 또한 높은 받음각에서 Nose Chine 효과를 분석하였다. 실험 연구에서 얻은 결과를 토대로 카나드 형상 항공기 높은 받음각 정적 안정성에 미치는 형상 변화 효과를 분석할 수 있었다.

모터중량 추정식과 반복 설계를 통한 틸트+정지로터형 eVTOL 개념설계 및 민감도 분석 (Conceptual design and sensitivity analysis of a tilt + stopped rotor type eVTOL using motor weight estimation formula and iterative design)

  • 이주헌;김태종;장서윤;조희수;황호연
    • 한국항행학회논문지
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    • 제27권1호
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    • pp.77-95
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    • 2023
  • 본 연구에서는 반복 설계를 통한 틸트 + 정지로터형 전기추진 수직이착륙 항공기(eVTOL)의 개념설계를 수행하였다. 현대자동차의 S-A1을 기준 형상으로 하여 도심항공모빌리티(UAM)의 개념을 사용하여 임무 형상을 정의하고 OpenVSP, XFLR5 소프트웨어를 사용하여 형상 설계와 공력해석을 수행하였다. 설계된 형상을 바탕으로 필요 동력을 추정한 뒤 배터리의 요구성능과 최대 이륙 중량(MTOW)을 계산하였다. Microsoft Excel과 Visual Basic Application을 사용해 반복적으로 계산하였으며, 이 과정에서 전기모터의 중량 추정식을 새롭게 고안하였다. 또한 자동화된 프로그램을 이용하여 eVTOL의 설계변수별 민감도 분석을 수행하였다.