Holonic-C2组织决策分配及演化方法

为了有效发挥指挥控制(Command and Control, C2)组织集中式决策和协作式决策的决策优势,对具有决策权限动态变化能力的Holonic-C2组织的决策分配问题进行研究。针对群决策中专家固定权重的主观性太强的缺点,提出基于专家权威性和意见一致性相结合的专家组选择方法,提高了决策分配过程中多属性决策的客观合理性;针对决策分配的动态演化问题,提出基于多阶段决策的决策模式演化机制,在考虑属性前后阶段的变化的基础上,给出相邻阶段决策模式跃迁方法。仿真结果表明,所提方法能够给出相对客观的决策模式的优劣排序以及多阶段的演化路线,从而证明了方法的可行性和有效性。     

Multifunctional A356 alloy/ PKSAnp composites: Microstructure and mechanical properties

Mechanical properties and microstructure of multifunctional composites produced with palm kernel shell ash nanoparticle (PKSAnp)-A356 alloy composites was studied. The composites were produced using Double layer feeding stir casting method (DLF-SCM) by adding 1 wt%‒4 wt.% PKSAnp. The microstructure, density, electrical and mechanical properties were determined. The results shows that there was a uniform distribution of the PKSAnp in A356 alloy. The mismatch at the interface between the PKSAnp and A356 alloy was 4.26%. Improvement of 30.47%, 41.91%, 49.52%, 40.90% and 65.09% were obtained for hardness values, tensile, yield strength, %elongation and impact energy at 4 wt% PKASnp. The work has established that the developed composites can be used for multifunctional applications where combination of toughness and strength is vital.     

Theoretical calculation and experimental study on the interaction mechanism between TKX-50 and AP

The combination of 5,5′-bistetrazole-1,1′-diolate (TKX-50) and ammonium perchlorate (AP) can make greater use of the chemical energy of TKX-50 based energetic materials. The research on the interaction mechanism between TKX-50 and AP is very important for designing TKX-50-AP compounds and judging the formation feasibility of composite particles, which can lay a theoretical foundation for the preparation of TKX-50-AP mixed crystals and the application of TKX-50 in propellant, propellant and explosive. Herein, in order to research the interaction mechanism between TKX-50 and AP, density-functional theory calculation was applied to optimize three configurations of TKX-50-AP compounds. The geometry structure, electrostatic potential and binding energy of the compounds were predicted, and the electronic density topological analysis was also carried out. Then TKX-50-AP mixed crystals structures were constructed, and the radial distribution function of H–O and H–N in mixed crystals was calculated. Finally, solvent/non-solvent method was applied to prepare TKX-50-AP composites, and the infrared spectroscopy and the non-isothermal decomposition performance of the composites were characterized. Results show that the superposition of positive charges in TKX-50 molecule and negative charges in AP makes the electrostatic potential distributions of TKX-50-AP compounds different from that of TKX-50 and AP. The interaction energies of TKX-50-AP 1, TKX-50-AP 2 and TKX-50-AP 3 are 39.743 kJ/mol, 61.206 kJ/mol and 27.702 kJ/mol, respectively. The interaction between TKX-50 molecules and AP molecules in TKX-50-AP mixed crystals both depends on hydrogen bonds and van der Waals force, and the number and strength of hydrogen bonds are significantly greater than that of van der Waals force. The composition of AP and TKX-50 makes the absorption peak of the five-membered rings and NH₃OH⁺ of TKX-50 shift to low wavenumber in the infrared spectroscopy. In general, TKX-50 interacts with AP via hydrogen bonds and van der Waals force, and the calculated results are in good agreement with the experimental results. The composition of TKX-50 and AP can also prolong the decomposition process.     

突破美对华信息与通信技术封锁的思考

信息与通信技术是影响国家政治、经济和军事等重要领域的高精尖技术。本文认为,美国政府通过启动"301调查"和建立出口管制实体清单等多种方式对中国信息与通信领域实施技术封锁和产品禁运,将延缓中国信息与通信技术的发展进度,加大全球信息与通信技术产业发展的成本消耗,但同时也刺激并加快了中国信息与通信技术自主可控的转型步伐。据此,本文提出加强顶层设计和统筹谋划、营造自主可控的产业生态环境、加强专业化人才队伍培养、构建合作共赢的命运共同体,努力突破信息与通信技术封锁等几项措施,以期为我国信息与通信技术领域的发展提供一定的借鉴意义。     

【专题】未来联合登陆破障需要把握的几个问题

在未来渡海登岛作战中,如何发挥多军兵种联合作战的整体威力,解决敌占岛屿水际滩头上布设的多种障碍物配套的大纵深、宽正面、高密度的障碍体系,实现登陆破障并为后续部队打开通路,是军队现实军事斗争准备必须认真研究的重点及难点课题。本文通过研究国内外与登陆破障发展体系相关的战役战法,着重从“侦察”“指挥”及“联合”三个方面进行分析探讨,为形成针对性强、操作性强的联合破障战法体系提供可靠理论依据,不断提高登陆破障研究的效益。此分析的目标是在高新技术条件下,联合战役集群在实施登陆作战时能够熟悉并准确获知敌海区岸滩、阵地编成以及障碍物配系等情况,塑造快捷高效的指挥模式,并形成一体化攻坚、破障及反制力量,为登陆部队创造有利条件。     

利用过阻尼电路合成高压方波脉冲

在过阻尼RLC电路分时放电的基础上,提出新型高压方波脉冲产生方法。理论分析表明:过阻尼RLC电路产生的双指数电压波与脉冲形成线产生的方形电压波具有类似的上升沿和平顶。电路模拟表明:通过人工过零技术可以对双指数电压波进行截尾,从而形成完整的高压方波脉冲。建立了原理验证性样机,由两组RLC电路构成,每组电路包含一台脉冲电容器和一只三电极场畸变气体开关,两组电路共用一个上升沿调节电感。实验证明:样机可以在电阻负载上输出幅值为17 kV、平顶宽度为330 ns～5.8μs、上升沿为100～350 ns的单极性高压方波脉冲。该方法适应性强,对负载变化不敏感,同时具有良好的可调节性,方波上升沿、平顶宽度连续独立可调。     

近地卫星Ka频段数传链路抗雨衰自适应模式设计

针对近地卫星数传时的信道时变性和严重的Ka频段雨衰现象,采用自适应编码调制(Adaptive Coding and Modulation, ACM)技术能够充分利用链路资源,相对于传统的固定编码调制方式,进一步提高链路的数据吞吐量。提出近地卫星Ka频段数传链路ACM模式设计方法,在降雨环境下建立Ka频段数传链路模型,根据链路预算的信道状况确定ACM选用模式;采用基于导频符号的最大似然信噪比估计算法结合移动平均的平滑方法实现信道估计,有效地减小了估计值的波动。仿真结果表明,无论晴天还是雨天,采用提出的卫星数传链路ACM模式设计方法,能够在保证系统可靠性的同时获取较高的数据吞吐量。     

PMI泡沫夹层结构雷达天线罩间接热-结构耦合分析与实验研究

机载PMI泡沫夹层结构雷达天线罩在环境温度变化时将产生表面变形现象并影响其使用性能,但对天线罩热变形结果进行实时检测分析具有一定难度。通过ANSYS间接热-结构耦合法建立了分析模型,对天线罩进行了计算分析,采用热膨胀片状模型进行了理论分析,在此基础上,设计并开展了温度冲击实验研究。结果表明, PMI夹层结构天线罩的热-结构耦合变形综合应变趋势是棱边处膨胀程度最大,由边缘至天线罩透波面中心处,膨胀程度逐渐减小;间接热-结构耦合计算应变值与实测应变值之间平均相差35.08%,间接热-结构耦合分析方法与模型具有一定的可信性。     

基于改进能量检测的航空集群网络干扰感知

为了增强复杂电磁环境中航空集群战术网络的抗干扰能力,提出把同时收发认知抗干扰电台应用于航空集群网络节点,且每个节点采用改进能量检测方法进行干扰感知。在此基础上,分别研究了存在单/多个干扰源时的网络节点干扰感知性能,推导出干扰感知的虚警概率和检测概率的闭式表达。仿真结果表明,通过调节改进能量检测器的参数p,可以提高航空集群机载战术网络的干扰感知能力。     

Phenomenological modelling of flow behaviour of 20MnMoNi55 reactor pressure vessel steel at cryogenic temperature with different strain rates

In the present study a phenomenological constitutive model is developed to describe the flow behaviour of 20MnMoNi55 low carbon reactor pressure vessel (RPV) steel at sub-zero temperature under different strain rates. A set of uniaxial tensile tests is done with the variation of strain rates and temperature ranging from 10⁻⁴ s⁻¹ to 10⁻¹ s⁻¹ and -80 °C to −140 °C respectively. From the experimental data, family of flow curves at different temperatures and strain rates are generated and fitted exponentially. The strain rate and temperature dependence of the coefficients of the exponential flow curves are extracted from these curves and characterised through a general phenomenological constitutive coupled equation. The coefficients of this coupled equation are optimised using genetic algorithm. Finite element simulation of tensile tests at different strain rates and temperatures are done using this coupled equation in material model of Abaqus FEA software and validated with experimental results. The novelties of proposed model are: (a) it can predict precisely the flow behaviour of tensile tests (b) it is a simple form of equation where fitting parameters are both function of strain rate ratio and temperature ratio, (c) it has ability to characterize flow behaviour with decreasing subzero temperatures and increasing strain rates.