基于虚拟样机的供输弹机液压系统故障仿真

供输弹机是火炮实现装填自动化的重要机构,涉及机电液等多种系统的耦合,故障率较高.为了能够真实地模拟供输弹机液压系统的故障过程,提出了适用于大型复杂系统耦合仿真的协同仿真方法,建立了完整的供输弹机虚拟样机,较好地解决了机电液耦合、多碰撞拓扑等难题,并通过实装试验数据验证了虚拟样机仿真的可信性.以溢流阀发生粘滞阻力过大和液控单向阀发生控制油路故障为例,说明了故障发生时供输弹机的动力学响应特性,明确了故障机理,为快速地进行故障特征提取和积累故障样本奠定了良好的基础.     

差动轮系在火炮补弹系统中的应用与分析

描述了某小口径火炮补弹系统的特点,设计了一种新型的差动轮系翻转机构。通过使用ADAMS机械系统动力学仿真软件建立动力学模型并仿真分析计算,得到翻转机构的动力学曲线和运动规律,仿真数据与理论计算数据相一致,结果表明ADAMS软件对复杂模型的仿真准确可靠,对以后的优化设计具有一定的参考价值。     

Investigation on the foaming behaviors of NC-based gun propellants

To prepare the porous NC-based (nitrocellulose-based) gun propellants, the batch foaming process of using supercritical CO₂ as the physical blowing agent is used. The solubilities of CO₂ in the single-base propellants and TEGDN (trimethyleneglycol dinitrate) propellants are measured by the gravimetric method, and SEM (scanning electron microscope) is used to observe the morphology of foamed propellants. The result shows that a large amount of CO₂ could be dissolved in NC-based propellants. The experimental results also reveal that the energetic plasticizer TEGDN exerts an important influence on the pore structure. The triaxial tensile failure mechanism for solid-state nucleation is used to explain the nucleation of NC-based propellants in the solid state. Since some specific foaming behaviors of NC-based propellants can not be explained by the failure mechanism, a solid-state nucleation mechanism which revises the triaxial tensile failure mechanism is proposed and discussed.     

部队资产管理与预算管理相结合长效机制建设的思考

按照武警总部资产管理与预算管理相结合的办法要求,公安现役部队实行了资产管理与预算管理相结合改革,取得明显成效,促进了保障效益的提高。如何确保资产管理与预算管理相结合走上规范化、经常化的轨道？如何确保这些工作有章可循、顺畅运转,具有长久的生命力？笔者通过分析目前部队资产使用和管理现状,提出了加强资产管理与预算管理相结合长效机制建设。     

Experimental investigation on anti-penetration performance of polyurea-coated ASTM1045 steel plate subjected to projectile impact

In this study, the anti-penetration performance of polyurea/ASTM1405-steel composite plate subjected to high velocity projectile was analyzed. Two kinds of modified polyurea material (AMMT-053 and AMMT-055) were selected and a ballistic impact testing system including speed measuring target system and high-speed camera was designed. This experiment was conducted with a rifle and 5.8 mm projectile to explore the effects by the polyurea coating thickness, the polyurea coating position and the glass-fiber cloth on the anti-penetration performance of polyurea/ASTM1405-steel composite plate. The result showed that the effects of polyurea coating position were different between two types of polyurea, and that the effects of glass-fiber position were disparate between two types of polyurea as well. For AMMT-053 polyurea material, it was better to be on front face than on rear face; whereas for AMMT-055 pol-yurea, it was better to be on rear surface although the difference was very subtle. Additionally, formulas had been given to describe the relationship between the effectiveness of polyurea and the thickness of polyurea coating. In general, AMMT-055 had better anti-penetration performance than AMMT-053. Furthermore, five typical damage modes including self-healing, crack, local bulge, spallation and local fragmentation were defined and the failure mechanism was analyzed with the results of SHPB test. Additionally, the bonding strength played an important role in the anti-penetration performance of polyurea/steel composite plate.     

武器装备研发成本补偿引入保险机制

随着我国军民融合武器装备研发生产体系的深度发展和社会主义市场经济体制的不断完善,武器装备研发中投入的研发成本面临很高的投资风险,成为困扰企业参与武器装备研发的重要因素。面对庞大的研发费用支出以及研发成本补偿措施不完善,企业要独自面对研发活动中的风险,这在一定程度上降低了企业参与装备研发的积极性。本文认为,通过保险机制的引入,鼓励企业为武器装备研发活动投保科技保险,同时,军方在对研发活动进行分析评判后,对企业的保费按比例进行分摊,能够在拓宽补偿途径的同时,利用保险分担企业研发过程中的风险,激发企业参与武器装备研发的热情,更好地为军队武器装备发展建设做出贡献。     

战斗建模中的作战Agent模型研究

围绕战斗建模中的作战Agent模型的实现问题,通过对坦克战斗过程的分析,提出了以属性建模、能力建模和行为机制建模为要点的作战Agent建模方法,并在此基础上建立了面向实际应用的作战Agent模型;通过推演实验和与兰切斯特方程的比较实验,验证了作战Agent模型在模拟和解释战斗活动时的可行性、有效性和可操作性。     

机构的工作能力储备及工作能力计算模型

机构工作能力的定量分析是研究机械产品可靠性的基础.提出了工作能力储备的概念,分析了工作能力储备与安全系数、约束条件参数及可靠度的关系.指出传统设计中采用安全系数来保证机械产品质量存在的缺点,进而给出机构工作能力的计算模型.为机构工作能力的定量描述奠定了基础.     

强化军地应急指挥机制建设

在军地联合处置突发事件行动中存在着建设重复,救援资源分散;协调困难,方案建设不对接;条块分割,指挥关系不顺畅以及反应迟缓,救援效率不高的情况。为适应军队新的编制体制调整,破解矛盾,文章研究了军队应基于军民融合战略着力强化一体化的军地应急指挥联动机制,强化常态化的军地应急指挥协调机制,强化规范化的军地应急指挥制度和科学化的军地应急指挥程序建设,以提高军队应急管理能力。     

航空集群系统构建机理研究

围绕航空集群系统构建问题,从集群系统构建基本概念与内涵、构建要素以及构建思路及流程3个方面对集群系统构建机理进行阐述。首先,在分析集群系统的基本概念与内涵的基础上,提出了集群系统构建的概念;然后,将集群系统构建要素分为硬件资源、软件资源以及网络资源,并进行了梳理;最后,在分析集群作战一般流程的基础上归纳出了集群系统构建思路,并给出了构建流程。