Flight dynamics characteristics of miniature unmanned ducted vehicle
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摘要: 为了研究无人涵道飞行器的配平特性与稳定性,首先进行了全尺寸涵道螺旋桨风洞吹风试验,分析了涵道螺旋桨的气动特性并建立了涵道螺旋桨的气动模型,在此基础上建立了无人涵道飞行器的飞行动力学数学模型,对无人涵道飞行器进行了配平特性与稳定性分析.结果表明:前飞速度与迎角对涵道螺旋桨气动特性影响很大,导致无人涵道飞行器在不同前飞速度下稳定性与操纵性变化较大.在悬停及小前飞速度下,无人涵道飞行器是一种类似倒立摆的不稳定体,而且气动阻尼较小,无人涵道飞行器的速度与姿态角发散很快,倍幅时间约为0.5 s;在大前飞速度下,无人涵道飞行器的气动阻尼增加,飞行稳定性改善,但出现了纵向反操纵现象,增加了无人涵道飞行器的飞行控制难度.Abstract: To investigate the flight characteristics of unmanned ducted vehicle, a full-scale ducted propeller wind tunnel test was conducted to build the aerodynamic model and analyze the aerodynamic characteristics of ducted propeller. On these foundations, the flight dynamic mathematical model of the vehicle was established to investigate the characteristics trimming and stability of unmanned ducted vehicle.The results indicate that the aerodynamic characteristics of the ducted-propeller are strongly influenced by the forward speed and attitude angle, leading to significant variations in stability and maneuverability of the unmanned ducted vehicle at different forward speeds. This unmanned ducted vehicle is an unstable body similar to inverted pendulum in hover and low forward speed. The aerodynamic damping is small, while the speed and attitude angle diverge quickly, with double amplitude in 0.5 s. The flight stability is improved due to the increase of aerodynamic damping at high forward speed. The reverse control brings difficulties to flight control the unmanned ducted vehicle.
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Key words:
- unmanned ducted vehicle /
- flight dynamics /
- trimming /
- stability /
- maneuverability
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[1] Moshier M,Bulaga R.Wind tunnel performance investigation of the solo trek XFV ducted fan system[R].Arlington,VA:Defense Advanced Research Projects Agency Defense Sciences Office (DARPA/DSO),2001. [2] Abrego A I,Bulaga R W.Performance study of a ducted fan system[R].San Francisco:Proceedings of AHS Aerodynamics,Acoustics,Test and Evaluation Technical Specialist Meeting,2002. [3] Harris R.Investigation of control effectors for ducted fan VTOL UAVs[R].Virginia:Virginia Polytechnic Institute and State University,2005. [4] Lind R,Nathman J K,Gilchrist L.Ducted rotor performance calculations and comparisons with experimental data[R].Reno,Nevada:44th AIAA Aerospace Sciences Meeting and Exhibit,2006. [5] Chang I C,Rajagopalan R G.CFD analysis for ducted fans with validation[R].Orlando,Florida:21th AIAA Applied Aerodynamics Conference,2003. [6] Martin P,Tung C.Performance and flow field measurements on a 10-inch ducted rotor VTOL UAV[R].Baltimore:American Helicopter Society 60th Annual Forum,2004. [7] 李建波,高正,唐正飞,等.涵道风扇升力系统的升阻特性试验研究[J].南京航空航天大学学报,2004,36(2):164-168. LI Jianbo,GAO Zheng,TANG Zhengfei,et al.Experimental investigation on lift and drag of ducted fan system[J].Journal of Nanjing University of Aeronautics and Astronautics,2004,36(2):164-168.(in Chinese) [8] 李建波,高正.涵道风扇空气动力学特性分析[J].南京航空航天大学学报,2005,36(6):680-684. LI Jianbo,GAO Zheng.Aerodynamic characteristics analysis of ducted fan[J].Journal of Nanjing University of Aeronautics and Astronautics,2005,36(6):680-684.(in Chinese) [9] Allen H J,Perkins E W.A study of effects of viscosity on flow over slender inclined bodies of revolution[R].National Advisory Committee for Aeronautics,NACA Report 1048,1949. [10] Graf W E.Effects of duct lip shaping and various control devices on the hover and forward flight performance of ducted fan UAVs[D].Virginia:Virginia Polytechnic Institute and State University,2005. [11] Fleming J,Jones T,Ng W.Improving control system effectiveness for ducted fan VTOL UAVS operating in crosswinds[R].AIAA-2003-6514,2003. [12] Roskam J.Airplane flight dynamics and automatic flight controls:Part I chapters 1 through 6[M].Lawrence:Roskam Aviation and Engineering Corporation,1979. [13] 吴大为,王亮.微小型螺旋桨滑流内舵面操纵特性实验研究[J].空气动力学学报,2011,29(5):567-572. WU Dawei,WANG Liang.Experimental investigation on plain flap control characteristics in slipstream of small scale propeller[J].Acta Aerodynamic Sinica,2011,29(5):567-572.(in Chinese) [14] Tobias E L.Development of modeling and simulation tools for analysis of ducted fan aircraft[D].Pennsylvania:The Pennsylvania State University,2008. [15] 高正,陈仁良.直升机飞行力学[M].北京:科学出版社,2003. [16] 普劳蒂.直升机性能及稳定性和操纵性[M].高正,陈文轩,施永立,等译.北京:航空工业出版社,1990. [17] Fletcher H S.Experimental investigation of lift,drag and pitching moment of five annular airfoils .National Advisory Committee for Aeronautics,NACA TN 4117,1957. [18] 方振平,陈万春,张曙光.航空飞行器飞行动力学[M].北京:北京航空航天大学出版社,2005.
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