【摘要】 以大展弦比无人机为例,研究刚体运动对飞机纵向气动伺服弹性(ASE)稳定性以及弹性运动对飞机纵向飞行力学稳定性的影响。针对带有反馈控制的飞机,建立了时域的刚体/弹性耦合运动方程;以刚体运动频率与一阶弹性频率的比值为参数,分别研究有无刚体模态时的ASE系统稳定裕度和有无弹性模态时的飞行力学稳定裕度。数值仿真表明,当飞机刚体运动频率与一阶弹性频率的比值大于0.01时,飞机刚体运动对ASE稳定裕度的影响逐渐显现;当该频率比值大于0.03时,飞机弹性运动对飞行力学稳定裕度的影响开始突现;当该频率比大于1时,刚体弹性耦合效应不可忽略。更多还原

【Abstract】 The effects of the rigid motion on longitudinal aeroservoelastic(ASE) stability and the flexible modes on longitudinal flight dynamics stability are studied,taking an unmanned aircraft with high-aspect-ratio wing as an example.Firstly,the equations of elastic aircraft motion with automatic control are deduced by considering the rigid and flexible motion coupling.And then,the stability margins of ASE systems with or without rigid motion are compared with,and the stability margins of flight mechanics with or without elastic modes are also calculated.The results indicate that the rigid motion becomes important to the stability margins of the ASE when the frequency ratio of the rigid motion to the first-order elastic mode is larger than 0.01.Meanwhile,the flexible motion can influence the stable margin of the flight dynamics when the frequency ratio is larger than 0.03.Furthermore,the rigid and flexible coupling can not be neglected when the frequency ratio is larger than one.更多还原