大展弦比弹性飞机着陆特性影响因素分析

安装点广义位移、结构阻尼系数和机体弹性振动频率对着陆冲击能量耗散效率有显著影响。以大展 弦比全球鹰无人机为例,基于拉格朗日方法建立刚弹耦合的弹性飞机动力学方程,对各模态质量、广义安装位 移、频率和结构阻尼系数等参数下的着陆特性进行仿真,分析各模态质量、广义安装位移、频率和结构阻尼系数 参数对缓冲器载荷和能量耗散时间的影响。结果表明:模态质量越小,安装点广义位移越大,缓冲器载荷越小; 安装点广义位移越大,结构阻尼系数越大,弹性振动频率越小,着陆冲击耗散速率越快。

Elastic model for high aspect ratio airplane landing impact analysis

In this paper, the dynamic equation of rigid-elastic coupling elastic aircraft is established based on Lagrange method. The landing characteristic of the Global Hawk UAV with large aspect ratio are simulated and analyzed under the parameters of modal mass, generalized installation displacement, frequency and structural damping coefficient. The results show that the elastic modal mass and the generalized displacement of the mounting point can affect the load, stroke, speed of the aircraft buffer and tire support reaction. The smaller the modal mass, the larger the generalized displacement of the mounting point and the smaller the load of the buffer. Generalized displacement of installation point, structural damping coefficient and elastic vibration frequency of body can affect the energy dissipation efficiency of landing impact. The larger the generalized displacement of installation point, the larger the structural damping coefficient, the smaller the elastic vibration frequency and the faster the impact dissipation rate of landing.