The problem of longitudinal dynamic stability of aircraft with high aspect ratio wing in the time - domain is simulated and analyzed by means of solving the aerodynamic equations,flight dynamic equations and structure vibration equations simultaneously. Based on a dynamic mesh technique,we use the unsteady Euler equations to calculate the aerodynamic force. Then we establish a model to express both the deformation and the (light position change,we simulate the dynamic responses of the structure vibrations and rigid flight motion by mean of the loosely- coupled methodology. Using this approach,we study the interaction of flight rigid motion and aeroelasticity for an aircraft with high aspect ratio wing. It is shown from the results that its low order elastic mode is tend to coupled with the flight rigid mode,and the unstabilities of both the flight rigid motion and the aeroelasticity appear. For this kind of aircraft, the interaction of rigid flight motion and aeroelasticity should be paid enough attention in the analysis process.%通过联立求解空气动力学基本方程、飞行动力学运动方程和弹性结构振动方程,在时间域内模拟和分析了大展弦比飞机纵向动力学稳定性问题.结合动网格技术,气动力计算采用基于欧拉方程的计算流体力学方法,结构变形和飞行姿态位置变化统一为模态表示方法,通过松耦合将飞行器姿态稳定性和结构变形稳定性施行了模拟.以某大展弦比机翼飞机为算例,研究了其刚体运动和机翼的弹性振动的相互影响.结果表明:对于具有大展弦比机翼的飞机,其机翼的低阶弹性模态易与飞机飞行中本身的刚体模态发生耦合,从而导致飞机机翼的气动弹性发散以及飞机本身刚体运动稳定性的改变.对于这类飞机,在其气动弹性和飞行稳定性的分析和设计中必须充分考虑到两种运动的相互影响.
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