斜截头弹体入水的弹道特性

Water-entry Trajectory of Truncated Cone-shaped Projectile

斜截头弹体的入水会发生姿态偏转和弹道弯曲。从理论上分析弹丸在水中的偏转过程,得出斜截头弹体姿态偏转方程。利用AUTODYN软件对斜截头弹体入水过程进行数值模拟,基于模拟结果提出描述弹体质心轨迹的经验公式,并通过试验验证其准确性。设计炮射垂直入水试验,利用高速摄像机记录弹丸的撞击速度和运动过程。试验结果表明:理论分析得出的姿态偏转方程可靠,数值模拟和基于数值模拟得出的质心弹道经验公式的预测精度可信。

The attitude deflection and trajectory bending of truncated cone-shaped projectile will occur during water-entry process.The process is analyzed theoretically and the attitude deflection equation is obtained.AUTODYN software is used to simulate the water-entry process of truncated cone-shaped projectile.Based on the simulation results,an empirical formula describing trajectory of centroid is proposed,and its accuracy is verified by experiments.The vertical water entry test of projectile is designed,and the impact velocity and motion process of projectile are recorded by high speed camera.The experimental results show that the attitude deflection equation obtained from theoretical analysis is reliable,and the numerical simulation and empirical formula of centroid trajectory based on numerical simulation is reliable.