论文部分内容阅读
研究了可变翼展飞机在变翼展过程中的气动特性及纵向飞行动响应。首先基于多刚体系统动力学方法建立了可伸缩机翼飞机的动力学模型,进而获得了纵向飞行动力学方程;然后分析了飞机质心、质量矩、惯性矩随翼展的变化规律;最后通过实时气动力计算和纵向飞行动力学方程联立求解,获得了不同翼展下的飞机升力、阻力、力矩及纵向飞行动响应。结果表明:在相同迎角条件下,大翼展飞机的升力性能与小翼展飞机的升力性能相比有较大的优势;未加控制时机翼收缩导致飞机阻力和升力减小,飞行速度增大;为维持变翼过程的稳定飞行,需要对俯仰运动施加控制。
The aerodynamic characteristics and longitudinal flight response of a variable wing spanning aircraft during its span-changing process are studied. First, based on the multi-rigid body system dynamics method, the dynamic model of the retractable wing aircraft is established, and then the longitudinal flight dynamics equation is obtained. Then the change rules of the mass center, mass moment and moment of inertia of the aircraft with wingspan are analyzed. Finally, The aerodynamic calculation and longitudinal flight dynamics equations are solved simultaneously to obtain the lift, drag, moment and longitudinal flight response under different wingspan. The results show that under the same angle of attack, the lift performance of a large wing aircraft has a great advantage compared with that of a small wing aircraft. The contraction of the wing leads to a decrease of the resistance and the lift of the aircraft without control and the increase of the flight speed Large; in order to maintain a steady flight of the winging process, the pitch motion needs to be controlled.