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Volume 34 Issue 8
Aug.  2008
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Journal of Beijing University of Aeronautics and Astronautics  > 2008  >  34(8): 887-890.
HU Xunyong, YANG Xiaomei, LI Haoyi, et al. Structural missing image inpainting based on low rank and sparse prior[J]. Journal of Beijing University of Aeronautics and Astronautics, 2022, 48(5): 855-862. doi: 10.13700/j.bh.1001-5965.2020.0663(in Chinese)
Citation: Wang Weijun, Guo Linliang, Qu Xiangjuet al. Analysis of the mechanics for ski-jump takeoff[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(8): 887-890. (in Chinese)
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Analysis of the mechanics for ski-jump takeoff

  • School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • Received Date: 10 Jul 2007
  • Publish Date: 31 Aug 2008
    Abstract
  • The matching between parameters of ski-jump ramp and flying performance/quality of carrier-based aircraft was analyzed based on the dynamic process of force polygon and the effect of ski-jump ramp on the pitch rotation of aircraft, and the building-up mechanism of the angle of attack at the initial stage after aircraft leaving the ramp at low speed was demonstrated. The building-up of the angle of attack results from following three aspects: The ramp provides the aircraft a positive pitch rate, which increases the angle of attack; When the nose landing gear leaves the ramp and the main landing gears do not, pitch down moment is provided by the ramp reacting force upon the main landing gears, and the pitch rate is decreased; While the aircraft just leaves the ramp, the lift cannot balance the gravity, so the acceleration vector points forward and downward, the speed vector is deflexed, and the angle of attack is increased. Simulation on the multi-bodies dynamic system of carrier/aircraft/landing gears shows that the above analysis is reasonable.

     

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  • [1] Senn C P,Eastman J A. Conventional takeoff and landing (CTOL) airplane ski jump evaluation Proceedings of Annual Symposium-Society of Flight Test Engineers. Lancaster: Society of Flight Test Engineers, 1983:3.5.1-3.5.10 [2] Jr Clark J W, Walters M M. CTOL ski jump: analysis, simulation, and flight test[J]. Journal of Aircraft,1986,23(5):382-389 [3] Imhof G, Schork W. Using simulation to optimize ski jump ramp profiles for STOVL aircraft AIAA Modeling and Simulation Technologies Conference. Denver: AIAA, 2000 [4] Liu Weiwei, Qu Xiangju. Modeling of carrier-based aircraft ski jump take-off based on tensor[J]. Chinese Journal of Aeronautics, 2005, 18(4): 326-335 [5] Rao P S, Saraf A. Performance analysis and control design for ski-jump takeoff AIAA Guidance, Navigation and Control. Austin,Texas: AIAA, 2003: 607-612 [6] 刘伟伟,屈香菊. 舰载机滑跃式起飞多体动力学系统的仿真 飞行力学与飞行试验学术交流年会论文集. 宜昌:中国飞行试验研究院,2005:30-38 Liu Weiwei, Qu Xiangju. Simulation of multi-body dynamics system of carrier-based aircraft ski-jump takeoff Proceedings of Flight Dynamics and Flight Test Academic Communion Annual Conference. Yichang: Chinese Flight Test Establishment,2005:30-38(in Chinese) [7] 刘伟伟．基于张量的舰载机滑跃起飞建模与仿真 ．北京:北京航空航天大学航空科学与工程学院,2006 Liu Weiwei. Modeling and simulation of the carrier-based aircraft ski jump takeoff based on tensor . Beijing: School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, 2006 (in Chinese)
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