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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。
Taking a large aspect ratio UAV as an example, this paper studies the influence of rigid body motion on longitudinal aerodynamic servo elasticity (ASE) and the effect of elastic motion on the longitudinal flight stability of the aircraft. For the aircraft with feedback control, the rigid body / elastic coupling equation in time domain is established. Taking the ratio of the rigid body motion frequency to the first-order elastic frequency as parameters, the stability margin of ASE with or without rigid body mode Flight Mechanics Stability Margin in Inelastic Mode. Numerical simulations show that when the ratio of rigid body motion frequency to the first-order elastic frequency is greater than 0.01, the influence of rigid body motion on the ASE stability margin gradually appears. When the frequency ratio is greater than 0.03, the effect of aircraft elastic motion on the stability of flight mechanics The effects begin to emerge suddenly; when the frequency ratio is greater than 1, the rigid body elastic coupling effect can not be ignored.