Impact Dynamics of Supercavitating Projectile with Fluid/Structure Interaction

As supercavitating projectiles move at high speed, the periodic impacts ("tail-slap") on the interior surface of the cavity generally occur due to disturbances. The interactions between the projectile and the water/cavity interface are the sources of structural vibrations, which affect the guidance of the vehicle and undermine the structural reliability. The Fluid/Structure Interaction calculation procedure of the tail-slaps of supercavitating projectile is established, and the dynamic behaviours of the projectile operating in tail-slap conditions with and without considering Fluid/Structure Interaction are obtained and compared. The responses of the projectile riding a reducing cavity are studied, and the effect of Fluid/Structure Interaction is also analyzed. The results show that the angular velocity of projectile increases as the body slowing down, and the amplitude of the elastic displacement response decreases at the beginning and increases when the cavity size is close to the diameter of the tail of projectile. The effect of Fluid/Structure Interaction reduces the amplitudes and frequencies of the impact loads and the vibration responses of the body, and when the speed is higher, the effect is more apparent.     

片梭织机纬纱飞行速度分析

介绍了一种新的纱线速度传感器的使用方法．该传感器可通过滤波纱线上的静电测量纱线速度,借助于该传感器测量图表展示了片梭织机纬纱飞行速度的曲线．同时,探讨了片梭织机上纬纱飞行速度和纱线张力、纱线弹性等之间的关系以及影响片梭飞行的因素．     

Experimental study of perforation and cracking of water-filled aluminum tubes impacted by steel spheres

Water-filled aluminum tubes were subjected to impact by six steel spherical projectiles of different diameters at impact velocities of 40–200 m/s. The effects of the diameter of the steel projectiles and of the material properties of the tubes on cracking and perforation were discussed. Water decreased the wall strength of the aluminum alloy tubes, and the impact velocity at which a steel projectile first passes through the tube wall decreased with increasing diameter of the steel projectile. Using the velocity at which the steel projectile perforates the tube wall, empirical equations of the energies required to perforate the tube wall were derived. Also, the energy balance in the steel projectile during a collision is discussed referring to the pressure history in the filled water and the velocities of the steel projectile before and after collision.     

隐身榴弹表面吸波材料的抗压强度分析

在火炮发射隐身榴弹过程中，由于隐身榴弹的静不平衡、动不平衡，造成隐身榴弹在膛内运动过程中碰撞膛线，其表面涂敷的吸波材料将承受较大的接触力．发射过程中应保证不损伤吸波材料表面，确保吸波材料具有良好的吸波性能、不增加隐身榴弹的雷达散射截面．从理论上计算了隐身榴弹与膛线之间的接触力，为研制隐身榴弹用的抗压吸波材料提供了设计指标．     

超强磁破甲弹磁头装置的磁路设计

介绍了超强磁破甲弹磁头装置的工作原理.通过对磁头装置的磁路设计,提出了磁头装置的工作点应选在有用回复能最大的位置上,并给出磁力计算方法和公式.     

钽在破甲弹药型罩中的应用

爆炸成形侵彻体（EFP）战斗部是应用最广的破甲弹战斗部之一. 破甲弹采用EFP战斗部时, 要求药型罩材料必须有好的动态延展性和一定的抗拉强度. 钽具有延展性好、密度大的特点, 是一种有前景的破甲弹药型罩材料, 其侵彻性能较传统的铜药型罩材料有很大的提高. 钽及钽合金药型罩（球缺形）的加工方法主要有三种： 机械加工成形、板材冲压成形和摆动碾压成形. 本文介绍了钽及钽合金药型罩材料与加工工艺的研究现状.     

我国穿甲弹用钨合金研究的最新进展与展望

综合介绍了我国近年来对穿甲弹用高密度钨合金实施添加微量元素合金化强化和旋转锻造、扭转变形、静液挤压等形变强化的研究进展，以及对于绝热剪切机理和数值模拟计算的研究现状，并介绍了机械合金化制备纳米钨合金复合粉末、温压成形及预氧化活化烧结等特种制备技术方面的最新试验研究进展。通过全面分析目前我国穿甲弹用高密度钨合金试验研究中存在的一些主要问题，提出我国穿甲弹用高密度钨合金今后研制的主攻方向，以及促进高性能穿甲弹用钨合金研制应采取的策略与措施。     

弹丸速度与弹道倾角之间的近似公式

运用近似公式定量分析过弹道顶点后一段时间内弹丸速度和弹道倾角之间的规律，解决了以往只能定性分析而不能定量分析的难题．为弹丸设计及分析弹丸的终点效应提供了方便．     

尾翼弹后效开翼原理实验研究

通过对２５模拟尾翼弹丸进行的射击试验，证明了膛口二维流场的存在以及它对弹刃尾翼张开的作用，结果表明，弹丸的尾翼可以在膛口二维气流的作用下在后效期内张开到位，利用这种途径，可以大大简化尾翼弹稳定装置的结构和生产工艺。     

在非惯性坐标系中抛射体的偏移与抛射角的关系

探讨了抛射体（炮弹、火箭或导弹）由于地球自转其偏移与抛射角的关系。