For a freely flying underwater supercavitating projectile, the relation between tailslap force of it and flying time was investigated by theoretical analysis. Using this equation of tail-slap load, a finite element analysis (FEA) was performed to investigate the structural response of the projectile. The simulation results showed that there is a linear relation between impact duration and time, and a reciprocal relation between the amplitude of impact loads and time approximately. In transverse and axial direction, the dominant frequencies of acceleration response are around 160 Hz. It is indicated that at the moment of starting movement,the compressive stress is tremendous large and the tensile stress and shear stress are not enough large. Maximums of the principal stresses and shear stress are all over 1 000 MPa.These maximums all appear in early part of the moving time. And then, the amplitudes of the stress fluctuations decrease along with time.%通过对水下超空泡射弹的相关碰撞动力学理论的综合分析,给出了完整的尾拍力随时间变化的关系式.在此基础上,对射弹的结构响应进行有限元仿真计算.结果表明,尾拍碰撞时间与飞行时间成正比,尾拍力大小与飞行时间近似成反比.纵向和横向的加速度响应的主频律都在160 Hz附近.在飞行初始时刻,压应力极大,拉应力和剪应力则不大.主应力和剪应力的最大值都超过1 000 MPa.该最大值出现在运动初期.随后,各应力值随时间波动并逐渐减小.
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