两栖UAV滑跳动力学特性仿真研究

Simulation and analysis of slide jump dynamic characteristic of the amphibious UAV

基于空气动力学、势流理论和二元平面滑行理论,建立了两栖UAV入水滑跳动力学模型。重点对两栖UAV入水滑跳动力学特性进行了分析,并研究了多种入水条件对滑跳状态的影响。结果显示:(1)两栖UAV触水瞬间,姿态出现明显变化,UAV出现瞬时剧烈抬头趋势;(2)两栖UAV入水攻角增大,会造成UAV较大的沾湿深度和较短的滑水时间;(3)入水俯仰角增大,会减小两栖UAV的沾湿深度和增大UAV的划水时间。研究结果可以为两栖UAV总体设计、飞行控制系统设计及飞行稳定性评估等方面提供理论依据和研究手段。

Based on the aerodynamic,the potential flow theory and the planning theory,a dynamic model of the slide jump ballistics of the amphibious UAV was developed.The slide jump dynamics characteristic of amphibious UAV had been analyzed in details,and the slide jump state had been researched on the impact of the several jumping condition.Results show that：（1）At the moment of touching water,posture of amphibious UAV changes violently and shows a intense rising trend instantaneously;（2）The angle of attack increasing will make the bedew depth increase and the slide time decrease;（3）The pitch angle increase will make the bedew depth decrease and the slide time increase.The work can give the theoretical foundation and study tools for the conceptual design,flight control systems design and flight stability assessment of the amphibious UAV.