Volume 37 Issue 10
Oct.  2011
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Wu Zhigang, Yang Chao, Jing Zhiwei, et al. Dynamic response analysis of airdrop for flexible aircrafts[J]. Journal of Beijing University of Aeronautics and Astronautics, 2011, 37(10): 1211-1217. doi: CNKI:11-2625/V.20111014.0830.002(in Chinese)
Citation: Wu Zhigang, Yang Chao, Jing Zhiwei, et al. Dynamic response analysis of airdrop for flexible aircrafts[J]. Journal of Beijing University of Aeronautics and Astronautics, 2011, 37(10): 1211-1217. doi: CNKI:11-2625/V.20111014.0830.002(in Chinese)

Dynamic response analysis of airdrop for flexible aircrafts

doi: CNKI:11-2625/V.20111014.0830.002
  • Received Date: 25 Jun 2010
  • Publish Date: 30 Oct 2011
  • Airdrop of heavy cargos can produce severe dynamic loads. Excitation of the loads have wide band of frequency, which can excite many higher order elastic modes. And the dynamic response may be amplified by the aeroelastic effects. A method of dynamic response analysis of heavy cargo airdrop for flexible aircrafts was presented. The equations of motion of the elastic flexible airplanes were deduced by applying energy method and considering rigid-body modes and elastic modes. The state-space equations of airdrop dynamics were established by applying rational function approximation of unsteady aerodynamics.Airdrop response can be simulated by numerical integration, in which the results of trim analysis were defined as the initial conditions. The numerical simulation of a transport aircraft was presented, and the influence of cargo mass on airdrop dynamic response was studied. Results show that elastic aircrafts have more severe airdrop response than rigid airplanes, and heavier cargo will arouse more severe response. For the aircraft without altitude stabilizer, airdrop will induce a decrease of the flight altitude.

     

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