电渗透防水防潮技术的工程应用

地下工程防水防潮一直是工程界的难题,传统技术存在难根治、易反复的缺点。选择某一洞库进行电渗透技术工程试点研究:先详细介绍电渗透技术和施工工艺情况;再采用在工程内布置电极并施加脉冲电压的方法,利用电场力迫使水分向工程外岩体移动,达到降低工程内部湿度、防水防潮的目的。工程应用表明,电渗透防水防潮技术拥有效果明显、运行费用低等突出优点,具有推广前景。     

Effects of Mg/PTFE pyrotechnic compositions on reignition characteristics of base bleed propellants and heating mechanism

The effects of magnesium/polytetrafluoroethylene (Mg/PTFE) pyrotechnic compositions on the coupled flow field and reignition mechanism are important aspects governing the performance and range of base bleed projectiles (BBPs).Owing to a decrease in pressure and temperature when the BBP leaves the muzzle,rapid depressurization occurs,which extinguishes the base bleed propellant.The Mg/PTFE py-rotechnic composition pressed in the igniter of the base bleed unit (BBU) provides additional energy to the BBU via a chemical reaction.Thus,the extinguished base bleed propellant is reignited under the effect of high-temperature combustion gas jets from the igniter.In this study,a numerical analysis is conducted to evaluate the effects of PTFE and Mg granularity as well as Mg/PTFE pyrotechnic compo-sitions.Owing to the rapid depressurization,the temperature and pressure was found to decrease for different Mg/PTFE pyrotechnic compositions.However,the depressurization time increased as the PTFE granularity increased,the Mg granularity decreased,and the Mg content increased.When the pressure in the combustion chamber of the BBU decreased to the atmospheric pressure,the combustion gas jets from the igniter expand upstream (rather than downstream).However,these combustion gas jets exhibit different axial and radial expansion characteristics depending on the pyrotechnic compositions used.The results show that the reignition delay time,td,of the base bleed propellant was 377.608,94.27,387.243,523.966,and 221.094 ms for cases A-E,respectively.Therefore,it was concluded that the Mg/PTFE pyrotechnic composition of case B was the most beneficial for the reignition of the base bleed propellant,with the earliest addition of energy and mass to the BBP.     

Dual-steering mode based on direct yaw moment control for multi-wheel hub motor driven vehicles:Theoretical design and experimental assessment

One of the main challenges for multi-wheel hub motor driven vehicles is the coordination of individual drivetrains to improve mobility and stability in the steering process.This paper proposes a dual-steering mode based on direct yaw moment control for enhancing vehicle steering ability in complex environ-ments.The control system is designed as a hierarchical structure,with a yaw moment decision layer and a driving force distribution layer.In the higher-level layer,the objective optimization function is con-structed to obtain the slip steering ratio,which represents the degree of vehicle slip steering in the dual-steering mode.A yaw moment controller using active disturbance rejection control theory is designed for continuous yaw rate control.When the actual yaw rate of the vehicle deviates from the reference yaw rate obtained by the vehicle reference model and the slip steering ratio,the yaw moment controller is actuated to determine the yaw moment demand for vehicle steering.In the lower-level layer,there is a torque distribution controller based on distribution rules,which meets the requirement of yaw moment demand without affecting the total longitudinal driving force of the vehicle.For verifying the validity and feasibility of the dual-steering mode,simulations were conducted on the hardware-in-loop real-time simulation platform.Additionally,corresponding real vehicle tests were carried out on an eight-wheel prototype vehicle.Test results were generally consistent with the simulation results,thereby demon-strating that the proposed dual-steering mode reduces steering radius and enhances the steering per-formance of the vehicle.     

姚锡光在甲午战争前后的军事思想及活动

姚锡光是晚清时期颇有建树的军事思想家。在中日甲午战争前后,他先后辅佐过李鸿章、李秉衡、张之洞等人,考察、研究和参与了一些重要的军事活动。其中,他的陆海协同、持久战等战略战术思想,在朝廷中许多人的认识水平之上,有些甚至足以影响甲午战争的进程。然而,由于他的军事思想大多没有在实践中得到应用,而逐渐被人们所忽视或淡忘。本文认为,研究姚锡光的军事思想,对正确总结甲午战争失败的教训,具有重要意义。     

贯彻军民结合方针做好五民标准化工作

本文是国防科技工业核能和平利用、民用航天、民用飞机、高技术船舶和民用爆破器材(五民)标准化顶层研究和规划成果的摘要综述。文中叙述了五民标准化工作现状,工作原则,发展目标,科研重点,以及各阶段的主要工作。     

国内外安全标准现状与发展及其对构建国防工业安全标准体系的启示

介绍了国外发达国家、先进组织机构安全标准及体系的现状与特点,分析了国内安全标准的制修订情况和危险化学品、防尘防毒安全生产标准体系的分类与构成。在分析国防科技工业安全标准现状的基础上,提出了构建国防工业安全标准体系的主要任务和实施要求。     

坦克炮控系统的反演滑模鲁棒摩擦补偿控制

坦克炮控系统存在低速摩擦,摩擦环节不但造成系统的稳态误差,而且导致极限环振荡、低速爬行等现象。为此提出基于反演理论的滑模鲁棒控制方法,通过Lyapunov稳定理论获得控制量。仿真结果表明该设计方法优于经典设计,为炮控系统实际设计提供了一种可行的方法。     

低RCS EBG波导缝隙阵列天线

将Mushroom电磁带隙结构(Electromagnetic Band Gap,EBG)的表面波带隙和同相反射特性同时用于波导缝隙阵列天线的设计,利用EBG的带隙特性抑制天线阵中的表面波,以改善天线的辐射性能;利用EBG的同相反射特性实现天线雷达散射截面(Radar Cross Section,RCS)的减缩,天线综合性能得到较大提升。制作了EBG波导缝隙天线阵样品,并对天线阵的阵元互耦、辐射方向图及天线阵RCS等指标进行了测试,结果与理论预期相吻合,有效地降低了阵元间互耦及天线阵RCS。     

基于FPGA+DSP的双核控制器硬件设计

在设计高实时性的系统时,针对基于DSP、单片机等串行运算方式的单核控制器无法实现高实时性的问题,利用FPGA的并行运行优点构建了基于DSP+FPGA的双核控制器,以达到提高系统实时性的目的。通过分析系统总体结构,主要设计完成了系统总线构架、DA电路、CAN总线和PROM电路,然后通过软件编程来验证硬件设计。经调试分析,该系统各部分运行正常,可为研究设计高实时性的控制器提供参考和借鉴。     

基于随机共振的多频率微弱信号并行检测

强噪声背景下的微弱信号检测是当前信号处理领域的研究热点。基于非线性理论的随机共振能够利用噪声,将噪声的一部分能量转移给信号,从而获得更高的输出信噪比。针对传统随机共振检测算法应用环境受限且无法实现多频率并行检测的现状,文章面向实际超短波环境,在参数补偿法的基础上,重新设计采样频率和补偿系数,提出了新的检测算法,实现了多频率微弱信号的并行检测。