末敏火箭弹约束期内动力学模型与研究

Dynamic Model and Simulation of Terminal-sensitive Rocket Bomb in Constraint Period

在筒内发射过程中,末敏子火箭弹的质量和质心位置随时发生变化,为研究末敏子火箭弹在筒内发射过程中的运动规律,采用Kane方法建立火箭弹在子弹筒内运动的约束期动力学模型,并对该模型进行Simulink仿真,得到在一定的落速、转速和初始扫描角条件下末敏火箭弹在发射过程中空间位置和姿态的变化规律。发射过程中稳态扫描角改变量与初始扫描角成正比,与发动机喷气的质量流率成反比;发动机推力偏心矩方向的随机性引起火箭弹扫描角的散布。

During terminal-sensitive rocket bomb launching in cylinder, mass and mass center position change over time. In order to ana- lyze the law of motion during launch, the dynamic model of motion of rocket bomb in cylinder in the constraint period was established by Kane method and simulated by Simulink. It was concluded that the variation law of rocket bomb space position and attitude was simulated with certain falling velocity, rotational speed and scan angle. In the progress, the variable quantity of steady scan angle is proportional to initial scan angle and inversely proportional to mass flow rate of rocket engine. In addition, randomness of thrust eccentric direction causes scatter of scan angle.