激光推进运载器大气飞行稳定性影响因素研究

针对环聚焦的Myrabo构型激光推进飞行器在大气中飞行现象,建立了激光推力器冲量模型,给出了光船飞行六自由度动力学模型。设计算法解决了脉冲力作用下,光船动力学方程的解算精度与效率折中问题;仿真分析了激光脉冲频率、脉冲能量和升力线斜率大小对光船运动稳定性影响。结果表明:在垂直方向,光船上升速度呈锯齿状,且存在脉冲频率下限;在侧向,激光脉冲频率越高,回复速度越快,回复曲线也越光滑,升力线斜率的增加能够使光船以更短的时间趋于稳定。

Study on Flight Stability Factors of a Laser-Propelled Launch Vehicle in Atmosphere

In this paper,an impulse model of the laser thruster and a six-degree-of-freedom movement model for Myrabo's lightcraft flighting in atmosphere are presented.A new algorithm compromising the precision and computing efficiency for dynamic simulation is developed.Several flight stability factors are explored,including the laser repetitive pulse frequency,pulse power and slope of lift curve.The simulation results show that a characteristic saw-toothed velocity is generated in vertical,and a lower limit of laser repetitive pulse for stable ascent is defined;In lateral pass,higher frequency of laser pulse can produce quicker reversion and smoother trajectory,and with the increase of slope of lift curve,the lightcraft can be stabilized in shorter time.