应用于超高速制导炮弹的介质波导天线

针对传统的分体设计天线不能很好的满足超高速制导炮弹在超高速、高过载环境下的飞行要求,提出了应用于超高速制导炮弹的介质波导天线。该天线采用了天线与无线电引信风帽的一体化设计,天线辐射单元主体采用金属圆波导结构,天线与射频发射链路之间采用绝缘子同轴馈电。在超高速制导炮弹无线电引信有限尺寸空间条件下,完成了天线的高增益和耐高温腐蚀设计,同时保持了传统波导天线工作频带宽、结构简单紧凑和易于加工的特点。实测结果表明,该介质波导天线不仅适用于超高速制导炮弹对外形尺寸的严格要求,而且在抗烧蚀、及探测性能各种测试条件下工作频带宽、增益高,与仿真结果基本一致。

某弹丸无损回收装置长度设计与验证

针对超高初速炮弹回收问题,提出了一种结构简单且安全可靠的回收实验装置来回收此类炮弹。该回收装置的介质为空气与水的混合体,通过向水中加入空气形成大量液泡,使得液泡具有可压缩性,利用液泡的可压缩性以及液体的阻尼特性,既可以实现降低高速弹丸的速度,又可以保证不对弹丸结构产生损伤。通过理论分析以及利用CFD技术进行仿真,得到炮弹最终减速情况,在满足要求安全过载的情况下,得出弹丸回收过程的速度、加速度以及压力曲线。仿真结果表明,在8.6 m长的回收装置中,可以将初速为1 000 m/s的弹丸在最大过载不超过20 000 g的情况下,最终速度减为0 m/s.最后通过对仿真结果与试验验证结果进行对比,发现两者趋势以及量级都比较吻合。

美国海军新概念武器现状和发展

新概念武器一直是各国竞相研究发展的方向。本文通过相关资料的解读,总结美国海军近期在固体激光武器、电磁轨道炮以及超高速制导炮弹的军事需求、研究现状及发展动向,可为我国相关武器的研究提供一定的参考。

Vibration Control of High-speed Cannonball Transport Mechanism Driven by Impact

A method is presented to control the vibration of high-speed cannonball transport mechanism due to the reduction of its weight, which adhere a nonlinear Zn-27Al-1Cu damping alloy layer and a constraint layer partly to the part of mechanism driven by impact. Based on the equivalent viscous damping theory and using curve fitting to describe the rule of the dissipation factor of damping alloy changing with stress, the nonlinear constitutive relation of Zn-27Al-1Cu damping alloy is given. The nonlinear spring damping contact model is adopted to describe the contact force of the clearance joint.Based on the nonlinear finite element contact theory, the outer impact contact force between the mechanism and its working environment is analyzed, and a coupled dynamic model of structural impact and mechanism motion with clearance joint is put forward. A dynamic model is established for the cannonball transport mechanism partly adhering Zn-27Al-1Cu damping alloy layer and constraint layer under complex impact conditions. At last, the feasibility of the method presented is proved by numerical simulation.