非线性气动恢复力与飞行器动稳定性  

Nonlinear aerodynamic resilience and aerocraft dynamic stability

作　　者：贾区耀[1] 方方 陈农[1] 杨益农[1] 

机构地区：[1]北京空气动力研究所,北京100074 [2]中国航天科技集团五院总体部,北京100086

出　　处：《空气动力学学报》2003年第4期446-448,共3页Acta Aerodynamica Sinica

摘　　要：复杂流动中,飞行器非定常气动数值计算后的参数辨识、飞行器模型的风洞定常测量、风洞动态(风洞自由飞)测量均显示了飞行器非线性气动刚度项(气动恢复力项、如俯仰力矩 攻角曲线Cm θ)将出现局部静不稳定( Cm/ θ>0)。　　飞行器气动恢复力对运动稳定性影响以往讨论较少,本文讨论了非线性气动恢复力局部出现静不稳定条件下的动稳定特性,其特点是突跃性、单边性与不确定性。飞行器飞行遥测数据分析支持了上述动稳定特性的描述。Parameter recognition of unsteady aerodynamics numerical simulation result,the wind tunnel steady testing and dynamic testing(the wind tunnel free flight) all show aerocraft nonli-near aerodynamic stiff term (nonlinear aerodynamic resilience , as pitching moment-angle of attack curve Cm-θ) appears part of instability (Cm/θ>0). The discussion that nonlinear aerodynamic resilience affects dynamic stability is less,this paper research aerocraft dynamic stability under nonlinear aerodynamic resilience appears part of instability ,its characteristic is jump,single side and uncertainty.The flight remote testing data analysis sustain the thesis of dynamic stability characteristic that the paper describes.

关 键 词：飞行器 动稳定性 非线性气动恢复力 俯仰运动 参数辨识 

分 类 号：V212.1[航空宇航科学与技术—航空宇航推进理论与工程]