基于模糊层次分析法的雷达导引头干扰效能评估

为评估对主动雷达导引头的干扰效能,结合导引头工作原理和功能特性,运用模糊数学理论,构建了对雷达导引头干扰效能进行评估的指标体系,建立了二级模糊评判模型,采用正态分布形式构造隶属函数,并利用指数标度的层次分析法(AHP)确定各因素的权重,使得判断矩阵的一致性指标得到改善,实现对雷达导引头的量化评估。最后选择噪声干扰为例进行模糊综合评判,实例分析结果表明该雷达导引头干扰效能模糊评判模型具有实用性,其评估结果可为干扰措施的选择提供参考。     

传感器协同射频隐身仿真系统性能评估

传感器协同射频隐身是未来战机取得空战优势至关重要的一种能力,它不仅与我方传感器的探测能力有关,还与敌方被动传感器的探测能力有关,同时受到具体对抗过程的影响,故对它的科学评估非常有难度。在详细分析了无源传感器截获有源传感器辐射过程的基础上,提出了传感器级、传感器协同级以及全过程系统级隐身对抗性能评价指标体系,并搭建了相应的射频隐身仿真评估系统,详细阐明了其工作原理和评估流程,为射频隐身系统的论证与研制工作提供参考。     

An integral equation for the second moment function of a geometric process and its numerical solution

In this article, an integral equation satisfied by the second moment function M₂(t) of a geometric process is obtained. The numerical method based on the trapezoidal integration rule proposed by Tang and Lam for the geometric function M(t) is adapted to solve this integral equation. To illustrate the numerical method, the first interarrival time is assumed to be one of four common lifetime distributions, namely, exponential, gamma, Weibull, and lognormal. In addition to this method, a power series expansion is derived using the integral equation for the second moment function M₂(t), when the first interarrival time has an exponential distribution.     

Consequence of reinforced SiC particles and post process artificial ageing on microstructure and mechanical properties of friction stir processed AA7075

Friction stir processing and post process artificial ageing was successfully carried out on AA7075 with and without reinforcement of SiC particles producing defect free processed zone with uniform distribution of filler material. Effect of SiC particle reinforcement and artificial ageing times on the microstructural modifications was characterized using optical and electron microscopy, electron backscattered diffraction and X-Ray diffraction. Hardness, impact and wear tests were carried out to investigate mechanical behaviour before and after processing. Reinforcement of SiC particles during FSP and subsequent age hardening treatment brought about nearly twofold increase in hardness and impact toughness values by the combined effect of grain refinement, Zener pinning, dispersion strengthening and precipitation hardening. Significant improvement in wear resistance in terms of wear loss was also observed after processing compared to the reference material AA7075-T6. Fractured surface of post FSP age hardened AA7075 alloy exhibited features of ductile fracture during Charpy impact test.     

层次分析法在装甲师作战能力评估中的应用

装甲师作战能力的评估,对装甲部队建设有重要的推动作用,但影响装甲师作战能力的因素很多。以往沿用的人数统计评估法、指数评估法等存在一定的不确定性,因此,采用层次分析法对部队的作战能力,给出一种定量和定性相结合的评估方法。     

坦克目标威胁程度评估

以军事理论和层次分析法为基础,将一种新的归一化效用函数应用于坦克目标的威胁程序评估,为地面作战自动化指挥提出了一种辅助决策方法。     

对篮球教练员谋略的探讨

本文通过对教练员的谋略过程、谋略原则和谋略的艺术等几个方面的分析 ,为教练员在竞赛和临场指挥中正确使用谋略提供理论依据与方法     

灰色层次分析决策方法在坦克评估中的应用

给出了利用灰色层次分析决策方法进行评估的一般步骤,并以坦克为例,构建了基于坦克的机动性、防护性、火力性、信息性、可靠性的评估模型。     

一种基于QFD的结构化装备作战需求论证方法

通过对装备作战需求分析,提出一种系统化、结构化的装备作战需求论证方法,为作战需求分析提供方法支持。该方法不仅可规范需求分析过程,增强需求分析过程的合理性、全面性和可操作性,而且对提高需求分析的理论水平,提高武器装备的论证质量,具有一定的意义。     

脉冲等离子体推力器工作过程一维磁流体动力学数值模拟

通过耦合脉冲等离子体推力器(PPT)工作过程中电场、磁场、流场之间的相互作用,描述了电容器放电、推进剂烧蚀、等离子体加速流动等过程,建立了基于磁流体动力学(MHD)的一维非定常数学模型,对PPT的工作过程进行数值模拟。对数值模拟结果作了相应分析,并将部分模拟结果与实验数据进行了比较。结果表明,模型正确反映了推力器放电过程、推进剂烧蚀质量与表面温度的变化趋势。