中文摘要：

基于计算流体动力学（Computational Fluid Dynamics,CFD）离散时间气动模型,计算了有无结构阻尼的薄平板在均匀流中分别受单自由度或两自由度（同时）初始位移激励下的系统气弹响应,分析了气弹位移及气动力时程特征及相互关系。研究表明：任意一个自由度的激励将激发起系统两个自由度方向的振动;低折算风速下,气动耦合项作用很小,气动力能对气弹系统产生气动正阻尼作用,且产生的竖弯气动阻尼大于扭转气动阻尼。研究还表明：系统任意一个自由度方向的气弹位移响应,以及升力或扭矩时程均有系统两个振动模态参与。气弹系统以某一系统频率发生的振动,是一个自由度方向的主运动和另一个自由度方向的耦合运动以一定的参与程度组合形成的牵连运动。

英文摘要：

Based on CFD （Computational Fluid Dynamics）discrete-time aerodynamic models and two degrees-of-freedom （DOF） analysis, aeroelastic responses of a thin plate with and without structural damping, which is placed in smooth flow and oscillates after initial excitation in vertical or/and torsional directions, are evaluated in this paper. The characteristics of aeroelastic displacements and self-excited aerodynamic forces, as well as the relationship among them are also presented. It is confirmed that the vertical and torsional oscillations would simultaneously occur, even though only one DOF excitation is applied. Additionally, at low reduced wind speed, the effect of coupled aerodynamic force on aeroelastic response is not notable, and the aerodynamic force can provide more aerodynamic damping to the aeroelastic system on vertical DOF than on torsional DOF. It is found that both the system＇s vibration modals are involved in each DOF aeroelastic response as well as in the aerodynamic forces. It is also found that the oscillation of a thin plate with a system frequency is one kind of embroiled oscillation, which combines a dominating motion in one DOF with a secondary motion in another DOF.