摘要
针对一种滚转稳定的固定翼双旋弹,对其非线性动力学进行了分岔特性分析,并在此基础上研究了各系统参数对其动力学分岔特性的影响。根据固定翼双旋弹非对称的特点,通过数值计算方法研究其飞行过程中平衡点随同向鸭翼安装角的变化规律,通过系统的分岔图得知系统具有三组稳定平衡点,其中只有一组平衡点为理想可行的稳定平衡点,因此需限定同向鸭翼安装角的范围以使固定翼双旋弹保持稳定飞行。在此基础上针对固定翼双旋弹弹道修正组件周期旋转和转角固定两种工作模式,通过各系统参数下的系统分岔图总结了固定翼双旋弹结构及气动力参数对其动力学系统分岔特性的影响。仿真结果表明,固定翼双旋弹的各气动力参数及飞行速度均对系统的分岔特性具有较大影响,应合理选定这些系统参数以使其具有良好的气动特性。
The nonlinear dynamic bifurcation characteristics of a fixed-canard dual-spin projectile are analyzed,and the influence of the system parameters on the dynamic bifurcation characteristics are researched.Based on the asymmetry characteristic of fixed-canard dual-spin projectiles,the variations of equilibrium points with installation angle of the homodromous fixed-canard are presented by the numerical method,and then the bifurcation diagrams are obtained.There are three stable equilibrium points,only one of which is the expected stable equilibrium point,so the range of homodromous fixed-canard installation angle needs to be limited to make the fixed-canard dual-spin projectile stable.Then the bifurcation diagrams with various system parameters are drawn when the trajectory correction component rotate periodically and when it is fixed,the influence on bifurcation characteristics of the system by structural and aerodynamic parameters are summarized.The results indicate that the aerodynamic parameters and the flight velocity of the fixed-canard dual-spin projectile have a great influence on the bifurcation characteristics of the system,so the parameters of system should be reasonably selected to make fixedcanard dual-spin projectiles have good aerodynamic characteristics.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2015年第12期3798-3808,共11页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(61350010)~~
关键词
固定翼
双旋弹
非线性动力学
分岔特性
平衡点
fixed-canard
dual-spin projectiles
nonlinear dynamics
bifurcation characteristics
equilibrium points
