光学波导中原子干涉的加速度测量

提出一种水平方向、光学波导中原子干涉的加速度测量方案。详细介绍了光路结构、原子团制备以及光学波导的绝热装载等。通过实验手段对测量方案进行验证,首先将~(87)Rb原子团冷却至50 nK的玻色爱因斯坦凝聚态,随后对超冷原子团施加布拉格光进行分束、合束,完成原子干涉过程。实验结果显示,所提干涉测量系统能够实现单轴加速度测量,对未来高精度多轴加速度测量系统的研制具有指导借鉴意义。     

MF-CFI: A fused evaluation index for camouflage patterns based on human visual perception

The evaluation index of camouflage patterns is important in the field of military application. It is the goal that researchers have always pursued to make the computable evaluation indicators more in line with the human visual mechanism. In order to make the evaluation method more computationally intelligent, a Multi-Feature Camouflage Fused Index (MF-CFI) is proposed based on the comparison of grayscale, color and texture features between the target and the background. In order to verify the effectiveness of the proposed index, eye movement experiments are conducted to compare the proposed index with existing indexes including Universal Image Quality Index (UIQI), Camouflage Similarity Index (CSI) and Structural Similarity (SSIM). Twenty-four different simulated targets are designed in a grassland background, 28 observers participate in the experiment and record the eye movement data during the observation process. The results show that the highest Pearson correlation coefficient is observed between MF-CFI and the eye movement data, both in the designed digital camouflage patterns and large-spot camouflage patterns. Since MF-CFI is more in line with the detection law of camouflage targets in human visual perception, the proposed index can be used for the comparison and parameter optimization of camouflage design algorithms.     

基于迭代误差补偿的发射点坐标精确求解方法

针对已知目标点坐标和射程射向情况下的发射点坐标精确计算问题,提出一种基于迭代误差补偿的非典型大地主题正解方法.该方法利用发射点方位角粗略计算目标点方位角,并调用大地主题正解方法,计算初始的发射点坐标和发射点方位角,将已知的发射点方位角和计算得到的发射点方位角之间的偏差作为负反馈,用于修正目标点方位角,通过迭代求解的方式得到发射点坐标.通过利用大地主题解算方式对非典型大地主题正解方法进行检验,得出发射点与目标点坐标之间的方位角偏差为10-7°,计算精度满足工程应用中的发射点坐标误差要求,能够用于军事指挥信息系统中发射点精确计算.     

一种无人机连发型电磁弹射系统的设计

为了满足集群作战条件下无人机快速连续地弹射起飞的要求,提出了一种无人机连发型电磁弹射系统的方案,阐述了系统的功能指标、结构以及控制策略和混合储能等技术,它具有机动性强、隐蔽性好、全程可控、弹射间隔短、发射成本低等特点,能根据不同要求弹射起飞不同的无人机,有效地解决无人机集群弹射起飞方式存在的局限性问题,对集群作战实现有力支撑.     

Theoretical and numerical simulation study on jet formation and penetration of different liner structures driven by electromagnetic pressure

The use of a shaped liner driven by electromagnetic force is a new means of forming jets. To study the mechanism of jet formation driven by electromagnetic force, we considered the current skin effect and the characteristics of electromagnetic loading and established a coupling model of"Electric—Magnetic—Force"and the theoretical model of jet formation under electromagnetic force. The jet formation and penetration of conical and trumpet liners have been calculated. Then, a numerical simulation of liner collapse under electromagnetic force, jet generation, and the stretching motion were performed using an ANSYS multiphysics processor. The calculated jet velocity, jet shape, and depth of penetration were consistent with the experimental results, with a relative error of less than 10％. In addition, we calculated the jet formation of different curvature trumpet liners driven by the same loading condition and ob-tained the influence rule of the curvature of the liner on jet formation. Results show that the theoretical model and the ANSYS multiphysics numerical method can effectively calculate the jet formation of liners driven by electromagnetic force, and in a certain range, the greater the curvature of the liner is, the greater the jet velocity is.     

Nitro-tetrazole based high performing explosives: Recent overview of synthesis and energetic properties

Heterocyclic skeleton (Azoles) and different energetic groups containing high performing explosives are highly emerged in recent years to meet the challenging requirements of energetic materials in both military and civilian applications with improved performance. For this purpose tetrazole (Azole) is identified as an attractive heterocyclic backbone with energetic functional groups nitro (-NO₂), nitrato (-ONO₂), nitrimino (-NNO₂), and nitramino (–NH–NO₂) to replace the traditionally used high performing explosives. The tetrazole based compounds having these energetic functional groups demonstrated advanced energetic performance (detonation velocity and pressure), densities, and heat of formation (HOF) and became a potential replacement of traditional energetic compounds such as RDX. This review presents a summary of the recently reported nitro-tetrazole energetic compounds containing poly-nitro, di/mono-nitro, nitrato/nitramino/nitrimino, bridged/bis/di tetrazole and nitro functional groups, describing their preparation methods, advance energetic properties, and further applications as high-performing explosives, especially those reported in the last decade. This review aims to provide a fresh concept for designing nitro-tetrazole based high performing explosives together with major challenges and perspectives.     

Study on energy release characteristics of reactive material casings under explosive loading

Reactive Materials (RMs), a new material with structural and energy release characteristics under shock-induced chemical reactions, are promising in extensive applications in national defense and military fields. They can increase the lethality of warheads due to their dual functionality. This paper focuses on the energy release characteristics of RM casings prepared by alloy melting and casting process under explosive loading. Explosion experiments of RM and conventional 2A12 aluminum alloy casings were conducted in free field to capture the explosive fireballs, temperature distribution, peak overpressure of the air shock wave and the fracture morphology of fragments of reactive material (RM) warhead casings by using high-speed camera, infrared thermal imager temperature and peak overpressure testing and scanning electron microscope. Results showed that an increase of both the fireball temperature and air shock wave were observed in all RM casings compared to conventional 2A12 aluminum ally casings. The RM casings can improve the peak overpressure of the air shock wave under explosion loading, though the results are different with different charge ratios. According to the energy release characteristics of the RM, increasing the thickness of RM casings will increase the peak overpressure of the near-field air shock wave, while reducing the thickness will increase the peak overpressure of the far-field air shock wave.     

Investigate the effects of magnetic fields on the penetration ability of a shaped charge jet at different standoffs

The influence of a magnetic field on the stability of a shaped charge jet is experimentally investigated at standoffs of 490, 650 and 800 mm. The experimental results without and with the magnetic field are compared in terms of the shaped charge jet form, stability and penetration ability. A theoretical model based on one-dimension fluid dynamics is then developed to assess the depth of penetration of the shaped charge at those three standoffs and magnetic conditions. The results show that the penetration capability can be enhanced in more than 70% by the magnetic field. The theoretical calculations are compared with the experimental results with reasonably good correlation. In addition, the parameters introduced in the theory are discussed together with the experiments at three standoffs studied.     

装备保障信息分类与代码设计研究

根据装备保障信息化建设的需要,分析了装备保障信息的特点,探讨了信息分类的要求并提出了装备保障信息分类方法;阐述了装备保障信息代码设计的要求、分类、形式．提出了代码设计方法。     

基于PLC的油泵车检测调控系统研究

油泵车作为管线系统重要的供油装备,具有牵一发而动全身的地位,为了保持管线系统稳定的工况和为下游泵站提供足够流量和进口压力,文中利用参数检测及报警系统、动力结合互锁系统、安全保护系统、嵌入式工况记录及数字化接口系统等信息化技术,使油泵车在不断提高自身作业能力、环境适应能力等机械性能与管线系统性能配套的同时,提高了其智能化水平和作业效率。