变质心控制的旋转弹动力学建模与仿真

Ballistic Model and Simulation of High Speed Rotary Projectile based on Moving Mass Center

针对高速旋转弹方向修正的难题,将变质心技术应用到高速旋转弹的弹道方向修正中。引入固连于瞬时质心的动质心坐标系,重点分析了由于质心偏移带来的弹体转动惯量、惯性积的变化以及所产生的控制力矩,基于外弹道学理论建立了变质心的高速旋转弹的6自由度弹道模型。仿真结果证明了变质心控制对于高速旋转弹具有理想的修正能力,惯性积是影响其稳定性和操纵性的重要因素。

In order to solve the difficult of direction correction,moving mass center control technique was applied to high speed rotary projectile trajectory correction.The concept of mass center coordinate system was introduced.It was analyzed that mass center excursion caused not only control moment but also variable moment of inertia and variable product of inertia.Based on exterior ballistic theory,6D ballistic model was established.The simulation example was given.The results show that moving mass center control technique is valid,and product of inertia is important factor for projectile stability and maneuverability.