基于分段插值的水上无人机离水特性求解方法

doi:10.7527/S1000-6893.2017.121369

Abstract

Abstract: The sea-UAV has become a hot spot of UAV research recently. Sea-UAV's hull is a key factor for the takeoff procedure. The well-designed hull can reduce engine power and takeoff distance; otherwise, the UAV would hardly take off, and engine power would even increase. Because the sea-UAV has a more complex force condition due to the particular takeoff environment, the takeoff performance analysis method applied to conventional aircraft is no longer available for the sea-UAV. Therefore, it is important to analyze the takeoff performance of the sea-UAV. The development of CFD makes it possible to use numerical calculation method to replace the experimental method, but it is not realizable to predict the multiphase performance of the sea-UAV by using CFD directly for it is time consuming and has enormous amount of calculation. In this paper, a decoupled calculation method is developed to predict the aerodynamic and hydrodynamic forces separated based on the different demands of Courant number. Meanwhile, the force in the vertical direction is assumed to be near balanced due to quite small resultant force and acceleration in this direction during takeoff. Based on this assumption, the discrete takeoff procedure is calculated by the piecewise interpolation method. The results can explain sea-UAV's takeoff characteristics, and match the experimental data well.

Key words: sea-UAV, takeoff performance, piecewise interpolation method, near balance assumption, decoupled calculation

CLC Number:

V271.5

LI Zhi, MA Dongli, YANG Muqing, GUO Yang, HU Haode. Piecewise interpolation method for calculating sea-UAV's takeoff performance[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(12): 121369-121369.

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Piecewise interpolation method for calculating sea-UAV's takeoff performance

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