大展弦比弹性飞机着陆特性影响因素分析  

Elastic Model for High Aspect Ratio Airplane Landing Impact Analysis

作　　者：李新华[1,2] 陈小荣[2] 史红伟 LI Xinhua;CHEN Xiaorong;SHI Hongwei(School of Aeronautic Science and Engineering,Beihang University,Beijing 100191,China;Caihong UAV Technology Co.,Ltd.,China Academy of Aerospace Aerodynamics,Beijing 100074,China)

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191 [2]中国航天空气动力技术研究院彩虹无人机科技有限公司,北京100074

出　　处：《航空工程进展》2020年第5期629-635,共7页Advances in Aeronautical Science and Engineering

摘　　要：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。The generalized displacement of installation point,structural damping coefficient and elastic vibration frequency can influence the energy dissipation efficiency of load impact.Taking Global Hawk UAV as an example,the dynamic equation of rigid-elastic coupling elastic aircraft is established based on Lagrange method.The landing characteristics of the Global Hawk UAV are simulated by using the parameters of modal mass,generalized installation displacement,frequency and structural damping coefficient,and the influence of the parameters on buffer load and energy dissipation time.The results show that the smaller the modal mass and the larger the generalized displacement of the installation point are,the lower of buffer load is.The larger the generalized displacement of installation point and structural damping coefficient are,the smaller of the elastic vibration frequency and the faster of the landing impact dissipation rate are.

关 键 词：弹性飞机 着陆冲击 动力学仿真 能量耗散 着陆缓冲器 

分 类 号：V212.13[航空宇航科学与技术—航空宇航推进理论与工程]