建立了大长细比弹丸刚体运动和柔性弯曲变形耦合的动力学模型;定义了柔性弹丸的平均弹轴系和刚体运动;以梁的弯曲理论为基础，推导了柔性弹丸的弯曲变形方程。在准静态变形条件下给出了柔性弹丸的攻角运动方程及其解，并由此获得了柔性弹丸的静态和动态稳定性条件，从中可看出柔性变形对 弹丸飞行稳定性的影响，为大长细比弹箭的设计提供了重要的理论依据。

A dynamic coupled-model of the rigid-body motion and the flexible bending motion for a projectile having a large slenderness ratio is developed, and the mean axis and the rigid-boay motion of a flexible projectile are defined. Based on the theory of bending of a beam，equation of the bending deformation of a flexi?ble projectile is formulated. For the case of quasi-static deformation，the equation of attack of a flexible projectile and its analytic solution are obtained, and hence the conditions of static and dynamic stabilization are presented m the paper. The bend?ing effects are shown to lead to a decrease in the flight stability of finned projec?tiles.