盖板式陶瓷热防护系统的传热性能优化

针对高超声速飞行器对盖板式陶瓷热防护系统的迫切需求,建立了热防护系统结构瞬态传热模型;并研究了防隔热层的物性参数,厚度尺寸,相变层的种类、位置等因素对热防护系统结构传热性能的影响。结果表明,隔热层物性参数及厚度尺寸对热防护系统结构传热性能具有决定性影响,而防热层的物性参数及厚度尺寸几乎不产生影响。相变材料的引入能够明显改善热防护系统结构的传热性能。调整和优化相变层位置是改善热防护系统结构传热性能、降低结构厚度的一个有效途径。隔热层厚度的优化结果可为热防护系统结构设计提供一定的参考和依据。     

探索性分析在作战实验中的应用

现代作战系统特征复杂,采用当前的作战实验方法对作战运行规律进行分析研究时,层次较低、缺乏整体性、对作战行为指导意义不明显。针对此问题,结合探索性分析思想,提出一种基于探索性分析的作战实验方法,设计了方法的研究框架,给出了主要研究内容的关键技术解决方法。最后,进行了实例分析,结果表明,方法在作战方案优化方面能起到较好的效果。     

陆军作战仿真模型标准化研究

模型标准化是规范仿真模型开发,避免低水平重复建设的重要环节。在对陆军作战仿真模型体系进行分析和归纳的基础上,对仿真模型架构、模型构建、模型管理以及模型交互进行了标准化设计,提出了基于插件机制的“柔性”仿真模型架构、仿真实体组件化建模机制、采用“方案－单元－实体－组件”方式的仿真实体管理机制以及采用消息驱动、事件订购和分发方式的模型交互机制。     

指挥信息系统安全防护系统视图

作为指挥信息系统安全可控运行的重要保障,网络安全防护体系目前存在着整体轮廓不清、顶层设计力度不够等问题。研究网络安全防护体系结构,可以增强安全体系综合集成,提高组件间的互操作性,有效解决网络安全防护的顶层设计问题。通过分析军事信息系统体系结构框架中系统视图模型的内容和相互逻辑关系,描述了支持网络防御作战的系统、系统功能及其相互关系,建立了系统视图的几种典型模型,为体系化建设网络安全防护体系提供了理论依据。     

Dynamic globularization prediction during cogging process of large size TC11 titanium alloy billet with lamellar structure

The flow behavior and dynamic globularization of TC11 titanium alloy during subtransus deformation are investigated through hot compression tests. A constitutive model is established based on physical-based hardening model and phenomenological softening model. And based on the recrystallization mechanisms of globularization, the Avrami type kinetics model is established for prediction of globularization fraction and globularized grain size under large strain subtransus deformation of TC11 alloy. As the preliminary application of the previous results, the cogging process of large size TC11 alloy billet is simulated. Based on subroutine development of the DEFORM software, the coupled simulation of one fire cogging process is developed. It shows that the predicted results are in good agreement with the experimental results in forging load and microstructure characteristic, which validates the reliability of the developed FEM subroutine models.     

Reduction of global effects on vehicles after IED detonations

Global effects caused by the detonation of an IED near a military vehicle induce subsequent severe acceleration effects on the vehicle occupants. Two concepts to minimize these global effects were developed, with the help of a combined method based on a scaled experimental technology and numerical simulations. The first concept consists in the optimization of the vehicle shape to reduce the momentum transfer and thus the occupant loading. Three scaled V-shaped vehicles with different ground clearances were built and compared to a reference vehicle equipped with a flat floor. The second concept, called dynamic impulse compensation (DIC), is based on a momentum compensation technique. The principal possibility of this concept was demonstrated on a scaled vehicle. In addition, the numerical simulations have been performed with generic full size vehicles including dummy models, proving the capability of the DIC technology to reduce the occupant loading.     

高速导弹末制导虚拟样机系统设计、建模及校验

总结了国内外虚拟样机技术的发展现状,结合目前正开展的高速末制导虚拟样机系统,对虚拟样机系统建摸、模型校验等技术进行了探讨,并提出了解决方案。     

关于一类特殊的（α，β）度量的S曲率

构造了一类具有5个参量的特殊的（α,β）度量,在此基础上计算了其射影平坦的条件,并通过计算得出其具有常S曲率。     

基于混合智能算法的小型通信干扰装备分配优化

如何充分发挥小型通信干扰装备的作战效能是指挥员面临的棘手问题。本文将战术指标——干扰后的通信畅通区覆盖程度作为评估通信干扰装备分配优劣的指标,分别建立了单机和多部干扰时的通信干扰有效压制区和通信畅通区边界的计算模型,并给出了通信干扰有效压制区和通信畅通区面积的计算方法。构建了基于机会约束规划的空域频域通信干扰任务分配模型,并设计了混合蚁群算法和遗传算法的模型求解算法。最后进行了仿真实验,验证分析了模型和算法的合理性。研究成果为通信对抗战术计算和作战运用研究拓展了思路。     

人工免疫系统的战场异态电磁信号检测模型

分析了复杂电磁信号环境下电磁信号监测的现实需求,抽象出"异态电磁信号"的概念。结合人工免疫系统建立起基于人工免疫系统的适用于复杂电磁环境下异态电磁信号检测模型,初步的信号检测实验表明该模型在信号检测准确性、检测时间等方面具有一定优势。