• Title/Summary/Keyword: 초소형비행체

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Load and Structural Analyses of Composite Micro Aerial Vehicle (복합재료 초소형 비행체의 하중 및 구조해석)

  • Koo, Kyo-Nam
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.33 no.5
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    • pp.34-40
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    • 2005
  • Most analyses and researches on Micro Aerial Vehicle(MAV) have focused upon propulsion, automatic control, aerodynamic configuration in low Reynolds number region, and miniaturization of telemetric parts. In the present study, a structural concept for MAV is designed by using the composite material suitable for light flight structures. In order to study the load path and stress state of the MAV, the load and structural analyses are simultaneously performed by the aeroelasticity module of MSC/NASTRAN. The stability derivatives of the MAV are obtained for three symmetric, two antisymmetric, and four unsymmetric maneuvering conditions. Although the aerodynamic theory in MSC/NASTRAN could not be proper for MAV analysis, it provides an traditional and effective tool for trim and load analyses and may be corrected with the results by more accurate theory or test. The results show that the inertial load due to payloads has a more effect on stress rather than the aerodynamic load.

Attitude Estimation Method through Attitude Comparison for Micro Aerial Vehicle (자세 비교를 통한 초소형 비행체의 자세 추정 기법)

  • 임종남;박찬국
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.34 no.8
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    • pp.63-70
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    • 2006
  • Due to the small size and weight of micro aerial vehicle (MAV), only miniaturized MEMS type sensors are applicable for MAV autonomous flight system. In this paper, we propose a accelerometer and gyro mixing algorithm to improve an attitude performance of MEMS type sensors. The performance of the proposed mixing algorithm is compared with the performance of fuzzy-based mixing algorithm through simulation. The simulation results show that the attitude compensation method through the attitude compensation has better performance than the fuzzy-based mixing method for MAV attitude estimation.

Leader - Follower based Formation Guidance Law and Autonomous Formation Flight Test of Multiple MAVs (편대 유도 법칙 및 초소형 비행체의 자동 편대 비행 구현)

  • You, Dong-Il;Shim, Hyun-Chul
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.39 no.2
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    • pp.121-127
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    • 2011
  • This paper presents an autonomous formation flight algorithm for micro aerial vehicles (MAVs) and its flight test results. Since MAVs have severe limits on the payload and flight time, formation of MAVs can help alleviate the mission load of each MAV by sharing the tasks or coverage areas. The proposed formation guidance law is designed using nonlinear dynamic inversion method based on 'Leader-Follower' formation geometric relationship. The sensing of other vehicles in a formation is achieved by sharing the vehicles' states using a high-speed radio data link. the designed formation law was simulated with flight data of MAV to verify its robustness against sensor noises. A series of test flights were performed to validate the proposed formation guidance law. The test result shows that the proposed formation flight algorithm with inter-communication is feasible and yields satisfactory results.

Development of a Micro Ornithopter with a Weight of 20 gram (중량 20그램의 초소형 날갯짓 비행체 개발)

  • Lee, Jae-Moon;Chang, Jo-Won;Jung, Yun-Sik
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.33 no.10
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    • pp.82-92
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    • 2005
  • The present study was carried out in order to develop a remote-controlled micro ornithopter with a weight of 20 gram. This ornithopter has three channel radio control. It runs on two direct-current type pager motors powered by a lithium polymer battery which flaps its 35cm wings. The performance of an ornithopter, applied to a flapping motion only, was validated by flight tests. The flight test results indicate that the ornithopter developed here has sufficient thrust to propel itself.

Design and Analysis for the Propeller of MAVs in Low Reynolds Number Flows (저레이놀즈수 영역의 초소형비행체 프로펠러 설계 및 해석)

  • Lee, Ki-Hak;Kim, Kyu-Hong;Lee, Kyung-Tae;Ahn, Jon
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.30 no.5
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    • pp.1-8
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    • 2002
  • The performance of MAV(Micro Air Vehicles) propellers is highly affected by the aerodynamic characteristics of a 2-D blade airfoil shapes. XFOIL is used to predict the lift and drag coefficients in low Reynolds Number flows. ARA-D 6%, which shows a good performance in low Reynolds Number regions, is selected as a blade airfoil. The 3-D propeller blade shape is optimized with the minimum energy loss condition, and the distribution of aerodynamic coefficients of ARA-D 6% is calculated. The designed optimal blade is compared with the Black Widow's propeller blade shape in the same conditions. The results indicate that the designed propeller installed in MAV can provide a good performance.

Design and Development of SNU MAV using Experimental Studies (실험적 연구를 통한 SNU 초소형 비행체 설계 및 개발)

  • 이영빈;김종암;김규홍;김우례
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.34 no.11
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    • pp.9-17
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    • 2006
  • The SNU MAV has been designed through studies on highly efficient aerodynamic shape and propulsion system. The configuration of the vehicle was determined from conventional empirical equations, iterative wind tunnel tests and flight tests. The propeller shape was optimized with the various thrust tests and RSM(Response Surface Method) to obtain the higher efficient propulsion system. It was certified that the MAV could fly for over 17 minutes with a 210mAh battery. In addition, it showed good flight characteristics in both stability and controllability.

MEMS Power Device (초소형 동력 장치)

  • Kwon, Se-Jin
    • Journal of the Korean Society of Propulsion Engineers
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    • v.12 no.1
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    • pp.64-70
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    • 2008
  • Thanks to the breakthroughs in micro fabrication technology, numerous concepts of micro aerospace systems including micro aerial vehicle, nano satellite and micro robot have been proposed. In order to activate these mobile micro systems, high density power in a small scale power source is required. However, we still do not have micro power source that has energy density that can support these systems. In the present article, status of micro power sources are described and alternatives that have been derived from the past experience are proposed.

Aerodynamic Characteristic of NACA XX08 Series at Low Reynolds Flow (NACA XX08시리즈의 저 레이놀즈수에서의 공력특성 연구)

  • Yun, Yeong-Jun
    • Proceeding of EDISON Challenge
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    • 2015.03a
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    • pp.636-641
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    • 2015
  • 초소형 비행체는 길이 150mm, 무게 100g 이하의 비행체이다. 초소형 비행체는 그 특성상 저 레이놀즈수에서 비행하며 저 레이놀즈수에서의 공기역학적 특성은 고 레이놀즈수에서의 공기역학적 특성과 큰 차이가 있다. 이는 초소형 비행체 개발 위해 저 레이놀즈수에서의 공력특성 연구가 필요함을 의미한다. 이에 따라 본 연구에서 NACA 4digit Airfoil의 캠버크기와 캠버위치의 변화에 따른 공기역학적 특성의 변화를 확인하였다. 캠버의 위치가 앞전 또는 뒷전으로 이동함에 따라 양력계수가 상승하는 것을 확인하였으며 캠버가 뒷전으로 이동함에 따라 실속이 지연되는 것을 확인하였다. 약 4도 이하의 받음각에서 익형의 아랫변에 발생하는 박리는 고 레이놀즈수에서의 실험에서 확인되어지는 공력특성과 큰 차이를 발생시켰다. 양항비 특성이 가장 우수한 익형은 NACA5808 인 것으로 확인되었다.

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Numerical Investigation of Aerodynamic Characteristics around Micro Aerial Vehicle using Multi-Block Grid (MULTI-BLOCK 격자 기법을 이용한 초소형 비행체 주위 공력 특성 해석)

  • Kim,Yeong-Hun;Kim,U-Rye;Lee,Jeong-Sang;Kim,Jong-Am;No,O-Hyeon
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.31 no.6
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    • pp.8-16
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    • 2003
  • Aerodynamic characteristics over Micro Aerial Vehicle(MAV) in low Reynolds number regime are numerically studied using 3-D unsteady, incompressible Navier-Stokes flow solver with single partitioning method for multi-block grid. For more efficient computation of unsteady flows, this flow solver is parallel-implemented with MPl(Message Passing Interface) programming method. Firstly, MAV wing with not complex geometry is considered and then, we analyze aerodynamic characteristics over full MAV configuration varying the angle of attack. Present computational results show a better agreement with the experimental data by MACDL(Micro Aerodynamic Control and Design Lab.), Seoul National University. We can also find the conceptually designed MAV by MACDL has the static stability.

생체모방 비행

  • Park, Hun-Cheol
    • Journal of the KSME
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    • v.52 no.4
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    • pp.39-43
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    • 2012
  • 이 글에서는 새와 곤충의 비행원리를 비교하고, 이들을 모방한 날갯짓 초소형 비행체의 등장 배경과 현재까지의 연구 동향을 살펴 보고, 향후 연구 방향에 대하여 소개한다.

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