战场态势感知关键技术研究

信息技术的飞速发展和战场复杂性变化,对态势感知技术提出了新的挑战.伴随着信息融合、数据挖掘、战场可视化等技术的发展,战场态势的内涵得到了极大的拓展.在对态势感知基本概念模型分析的基础上,分析了影响态势感知的因素,并对态势感知涉及到的关键技术研究进展进行了分析,最后对战场态势感知技术的发展提出了展望.     

Numerical simulation study on penetration performance of depleted Uranium (DU) alloy fragments

Due to its high strength, high density, high hardness and good penetration capabilities, Depleted ura-nium alloys have already shined in armor-piercing projectiles. There should also be a lot of room for improvement in the application of fragment killing elements. Therefore, regarding the performance of the depleted uranium alloy to penetrate the target plate, further investigation is needed to analyze its advantages and disadvantages compared to tungsten alloy. To study the difference in penetration per-formance between depleted uranium alloy and tungsten alloy fragments,firstly, a theoretical analysis of the adiabatic shear sensitivity of DU and tungsten alloys was given from the perspective of material constitutive model. Then, taking the cylindrical fragment penetration target as the research object, the penetration process and velocity characteristics of the steel target plates penetrated by DU alloy frag-ment and tungsten alloy fragment were compared and analyzed, by using finite element software ANSYS/LS-DYNA and Lagrange algorithm. Lastly, the influence of different postures when impacting target and different fragment shapes on the penetration results is carried out in the research. The results show that in the penetration process of the DU and tungsten alloy fragments, the self-sharpening properties of the DU alloy can make the fragment head sharper and the penetrating ability enhance. Under the same conditions, the penetration capability of cylindrical fragment impacting target in vertical posture is better than that in horizontal posture, and the penetration capability of the spherical fragment is slightly better than that of cylindrical fragment.     

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.     

软件定义的航天器测试网络技术

航天器测试网络是航天器自动化测试运行、测试数据监测分析等测试业务运行的信息通道,它的性能将极大影响航天器试验测试效率与试验数据的应用效能。针对传统航天器测试网络存在的物理独立部署、人工迁移、存在数据孤岛以及无法高效交换共享的不足,本文参考借鉴软件定义网络技术,设计了基于虚拟局域网及软件定义网络技术的软件定义航天器测试网络。该测试网络技术具备良好的软件重构、区域隔离、测试信息汇聚共享性能,能够通过软件重构,自动化迁移部署航天器测试网络;通过网络区域逻辑隔离,确保各航天器测试指令运行区域受控、安全;通过全局测试数据汇聚实现多航天器测试数据的交换共享,从而有效解决了航天器测试网络快速部署、测试指令安全运行与测试数据交换共享的问题,有力推动了装备试验数据工程的建设工作。     

车用磁流变减振器动力性能实验分析

MRF阻尼器结构简单、体积小、能耗低、反应迅速且阻尼力可调范围广, 已经成为新型履带车辆半主动悬挂系统优先选择的方案。基于磁流变液体本构关系的Bingham模型,对影响车用磁流变减振器的阻尼力的各种因素进行了综合分析。对自行研制的双出杆剪切阀式磁流变减振器进行了实验研究,获得了不同振幅、频率、电流强度下的阻尼力变化曲线,从不同的侧面获得了MRF阻尼器的动力性能。结合Hrovat限界最优半主动控制算法和车辆悬挂系统振动的半主动控制策略,仿真分析了磁流变阻尼器对整车振动的控制效果,并与LQR控制结果作了比较。     

基于摩擦磨损的数学模型的分布及讨论

主要讨论基于摩擦磨损的数学模型的分布性态和分布近似问题。引用无穷小概念,结合0-1律讨论了该模型的分布收敛于退化正态分布的条件。并在一定的矩条件下,利用特征函数,得到了该模型的分布近似于标准正态分布的误差。     

基于电流变液的火炮反后坐技术研究

根据火炮反后坐装置的技术特点和电流变液的力学性能,从理论上分析了电流变液技术用于火炮反后坐装置的可行性,设计了简易电流变液驻退装置的结构和控制策略,并对关键的技术问题进行了探讨。     

基于应变测量法的几种典型悬臂梁的挠度测量

挠度变形是工程梁设计中的一项重要指标,为了更加准确地测量梁的挠度变形,提出了采用应变式传感器进行挠度测量的方法对几种典型的悬臂梁的挠度进行测量,该方法是利用挠度与外载荷(外力偶)、弯矩与应力、应力应变之间的关系,导出梁的挠度与应变之间的关系,从而由测得的应变得出悬臂梁在外载荷作用下的挠度。测量结果表明该测量方法测得的结果大大地提高了挠度测量精度。     

基于可信度的网络安全性分析方法

提出了一个基于可信度方法的网络安全性分析模型。该模型在脆弱点信息、脆弱点之间的关系、脆弱点与安全性的关系的表示中引入可信度因子,通过不确定推理对主机和网络的安全性进行分析。该模型能综合考虑诸多因素,有效处理安全性分析中的不确定知识。     

金属膜陶瓷膜净水技术试验研究

试验研究了金属膜陶瓷膜净水的主要影响因素及变化规律,提出了用金属膜陶瓷膜净水工艺替代传统的加药混凝、沉淀过滤净水工艺的水处理系统。重点研究了不同种类金属膜对浊度物质的去除、膜压差及膜渗透通量随时间的变化规律;陶瓷微滤膜渗透通量、出水浊度随时间的变化规律及在不同膜压差、不同进口流量的情况下膜渗透通量随时间的变化规律。试验表明了金属膜陶瓷膜具有良好的过滤性能。