调炮精度检测中双经纬仪优化布站方法

针对“双经纬仪法”检测调炮精度中随机布站使测量系统达不到最佳测量精度的问题,提出了一种优化布站方法.根据火炮调炮范围确定了调炮精度检测中的测量区域,推导出了双经纬仪测量系统对于该测量区域的平均测量不确定度公式.结合某型火炮设计了基于遗传算法的具体优化过程,对测量系统的3个位置参数进行优化,得到最佳测量布局,并通过仿真试...     

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.     

基于多智能体的油料保障组织机构设计

组织是油料保障系统问题的重要方面,Agent组织是一种有效的组织结构设计方法。将π演算和化学抽象机分别运用到军队油料保障组织结构的形成和设计过程,对MAS(Multi-agent systems)组织结构进行设计,并给出了应用示例,该设计方法对油料保障组织机构设计研究有重要的意义。     

用于纯方位机动目标跟踪的机动探测法

假设目标在某时刻发生折线机动,并且目标在机动前后都是做匀速直线运动。所提出的机动探测算法通过探测这种变化得到探测时刻。这种算法是基于对方位预测误差的均值变化进行分析的。然后估计出目标机动时刻,并从机动时刻起重新设置滤波器,估计出目标机动后的运动参数。典型的机动TMA态势仿真结果表明,该算法对于一般的目标折线机动可以有效地进行跟踪。     

基于信号的自动测试系统软件研究

分析了ATLAS 2K语言和IVI-S ignal Interface标准的系统模型和异同点,结合二者,给出了基于信号的自动测试系统软件设计方法,该方案为通用自动测试系统软件设计提供了技术实现途径。     

避雷针保护范围的图形仿真与图解法分析

针对避雷针设计过程中计算公式过于复杂的问题,提出了利用平面几何作图求解避雷针联合保护范围的方法,给出了单支、双支和四支避雷针保护范围的作图解题步骤,并利用计算机图形仿真,给出了避雷针保护范围的空间结构图形。     

高等数学与后续相关课程的成绩统计及数理分析

高等数学是大学教育中的主要基础课,与后续课程有密切联系。通过成绩统计和相关性分析,说明高等数学与其后续相关课程之间的关系和影响,提出数学教学的想法。     

从档案看李烈钧与湖口反袁起义

1913年7月12日爆发的江西湖口反袁起义,打响了二次革命战争。革命党人李烈钧充当了反袁急先锋。但当李烈钧由上海回到湖口准备起兵之际,因江西要塞司令陈廷训叛变投敌,北洋精锐第6师李纯部已在九江至沙河一线布防。这样,李烈钧所率领的讨袁军只能仓卒地投入战斗。旅长、左翼司令林虎首先发起攻击,于战斗失利后,旅长、右翼司令方声涛才率部进攻金鸡炮台。因此,李纯得以从容调集兵力,先后击败了讨袁军的左右两翼部队。其时,江西护军使、江西第1师师长欧阳武并不赞同起兵反袁,且加消极抵制,江西第2师师长刘世均更是动摇不定,脚踏双船,加以北洋军又策反一部分江西军队倒戈,这一切严重削弱了讨袁军的战斗力。不久,敌方援军第2师王占元部开抵江西,袁世凯任命的第1军军长段芝贵全权指挥陆军,在海军次长汤芗铭所率海军的配合下攻占了湖口。此后,讨袁军在李烈钧的指挥下,作有序的撤退。瑞昌、德安、南康等地相继陷敌。最后,李烈钧不得不于8月16日撤离,由省城南昌往长沙,辗转赴沪,再赴日本流亡于海外。湖口反袁起义宣告失败。     

动态灰色时序系统 DGTS 及其在安全策略规范中的应用

设计安全策略模型时应考虑安全策略的时序特性和灰色特性,还应综合考虑保密性、完整性和可用性三方面的需求。已有的安全模型没有描述时序性和灰色特性,而且一般只侧重描述保密性或完整性。为此,本文提出了动态灰色时序系统（简称ＤＧＴＳ）。本文详细描述了ＤＧＴＳ,以及基于ＤＧＴＳ的动态语义设计的灰色时序安全策略规范语言ＧＴＳＬ。