对数正态分布下壳一核型微球对红外的消光

本文研究了对数正态分布下壳一核型微球的消光，数值计算了镀金属微球在红外波段的质量消光系数，比较了壳一核型单分散微球与对数正态分布下多分散微球的质量消光系数的异同。结果表明：当波长较短时，有较大质量消光系数的粒径范围较窄；随波长增加，最大质量消光系数减小，相应的最佳粒径增大；在一定粒径范围内，单分散粒子的质量消光系数比对数正态分布下多分散粒子的大，波长越短，此范围越小；在相同波长、镀覆厚度下，镀铝微球的消光最佳，镀铜的比镀银的好。     

对数正态分布下壳--核型微球对红外的消光

摘要本文研究了对数正态分布下壳—核型微球的消光,数值计算了镀金属微球在红外波段的质量消光系数,比较了壳—核型单分散微球与对数正态分布下多分散微球的质量消光系数的异同.结果表明:当波长较短时,有较大质量消光系数的粒径范围较窄;随波长增加,最大质量消光系数减小,相应的最佳粒径增大;在一定粒径范围内,单分散粒子的质量消光系数比对数正态分布下多分散粒子的大,波长越短,此范围越小;在相同波长、镀覆厚度下,镀铝微球的消光最佳,镀铜的比镀银的好.     

膨胀石墨烟幕对1.06μm和10.6μm激光的消光特性研究

为测试膨胀石墨烟幕红外激光消光特性,在分析膨胀石墨烟幕消光机理的基础上,通过测量其在不同时段的烟幕平均质量浓度和平均激光透过率,得到了膨胀石墨烟幕对1.06μm近红外和10.6μm远红外激光的质量消光系数分别为1.149 8m<'2>/g和0.820 5m<'2>/g.结果表明,膨胀石墨烟幕对两个波长的红外激光具有良好的消光和干扰效果,在光电对抗领域具有广阔的应用前景.     

红磷与纳米氧化铝组合烟幕对10.6μm激光的消光系数研究

为了提高红磷烟幕对10.6μm激光的消光性能,在中型烟幕试验柜中分别测试了纳米氧化铝气溶胶、红磷及其组合烟幕对10.6μm激光的质量消光系数。在空气相对湿度为40%的条件下,纳米氧化铝气溶胶、红磷及其组合烟幕对入射功率为1.0W的10.6μm激光的平均质量消光系数分别为0.222,0.298,0.449m2.g-1。根据试验结果,纳米氧化铝气溶胶和红磷烟幕组合使用后可以显著改善纳米氧化铝粉体的分散特性,并使得红磷烟幕对该波段激光的质量消光系数提高50.7%。     

纳米镍粉对1.06μm和10.6μm激光的消光性能研究（英）

在容积为20 m3的烟幕箱中测试了30 g纳米镍粉形成的烟幕对1.06μm和10.6μm激光的消光性能。其质量消光系数分别为1.542 m2.g-1、1.078 m2.g-1,沉降速度为1.035×10-3m.s-1,与常规材料的烟幕性能比较表明,纳米镍粉形成的烟幕消光性能好,悬浮时间长,是一种能有效干扰1.06μm和10.6μm激光的新型烟幕材料。     

几种纳米氧化铝的红外消光性能研究

利用傅里叶变换红外光谱仪在中型烟幕试验柜中,对八种α型和γ型纳米氧化铝粉体气溶胶在3~5μm与8~14μm波段的红外消光特性进行了测试对比。利用KBr压片法测试了样品的红外光谱,给出了样品的晶型、平均粒度和比表面积等特征数据。实验结果表明,纳米氧化铝对红外具有良好的消光作用。纳米氧化铝气溶胶在3~5μm和8~14μm波段的最大质量消光系数分别为1.798m2·g-1和1.940m2·g-1;γ型纳米氧化铝的红外平均透过率普遍小于α型;比表面积越大、纳米氧化铝粒子平均直径越小对红外的消光性能就越显著。     

三维石墨烯粉体制备及其红外消光性能

为了探究三维石墨烯的红外消光性能,采用热化学沉积法制备了三维石墨烯粉体,通过电镜、拉曼光谱仪和X射线衍射仪表征了三维石墨烯粉体的形貌和结构特征,利用粉体综合特性仪测试了其流散性;利用烟幕箱试验测试了三维石墨烯的红外消光性能,并与复合石墨、碳纤维的消光性能进行了比较。结果表明：三维石墨烯的红外消光性能优异,在红外波段为3~5 μm和8~14 μm时,其平均质量消光系数分别约为1.32 m²·g^-1和1.09 m²·g^-1。与复合石墨和碳纤维相比,其在3~5 μm的平均质量消光系数分别提高了57%和132%,其在8~14 μm的平均质量消光系数分别提高了35%和102%,具有更优异的红外消光性能。     

喷雾干燥工艺条件对HMX/F_(2602)核壳复合微球粒度的影响

采用悬浮喷雾干燥法将偏氟乙烯和六氟丙烯共聚物(F_(2602))包覆于HMX颗粒表面,制备了HMX/F_(2602)核壳复合微球。采用共混溶液喷雾干燥法制备了HMX/F_(2602)复合微球。探讨了进口温度、进料速率和料液浓度等悬浮喷雾干燥工艺条件对HMX/F_(2602)核壳复合微球粒度的影响。利用扫描电子显微镜(SEM)、激光粒度分析仪和撞击感度仪表征了两个样品的形貌、粒度和撞击感度。结果表明,悬浮喷雾干燥法的优化工艺条件为:入口温度85℃,进料速率3 m L·min~(-1),料液浓度2%。HMX/F_(2602)复合微球有内部缺陷,中值粒径为4.75μm。HMX/F_(2602)核壳复合微球为实心球状,中值粒径1.23μm。HMX/F_(2602)复合微球和HMX/F_(2602)核壳复合微球的撞击特性落高分别为31.23 cm和41.37 cm,显示HMX/F_(2602)核壳复合微球有更好的性能。     

氧化剂对红磷烟幕抗10.6μm激光性能的影响研究

在红磷发烟剂中分别加入四氧化三铁、三氧化二铁、氧化锰、硝酸铯、硝酸锶等氧化剂和可燃剂金属镁配制成六种发烟剂,在烟幕试验柜中测试了这六种不同配方烟幕的成烟时间、沉降速度和对10.6μm激光消光系数。研究表明,硝酸铯或硝酸锶作氧化剂时,烟幕的成烟时间分别为20 s和15 s,沉降速度分别为0.0021 m.s-1和0.0019 m.s-1,可以改善发烟剂的燃烧性能,而且烟幕对10.6μm激光的消光能力提高了41.9%和38.7%,因此,硝酸锶更适合作红磷烟幕的氧化剂。     

气动雾化法合成TATB

采用气动雾化法合成了TATB炸药，合成的TATB平均粒径为5．575μm，且悬浮颗粒的平均粒径为0．611μm。     

Expert Systems Aimed at General Design of Projectiles

Expert systems aimed at the general design of projectiles can implement a series of intelligent designs, such as the design of HE shell, the scheme expounded and proved, the emulation analysis and calculation, etc. Aiming at the product design feature, the expert system adopts the object-oriented knowledge representation and all kinds of inference control engines to describe and reason the relevant knowledge regarding the product through the microcomputer. It embodies the foundation of emulation analysis and simulated manufacturing of the shell. It makes use of the method that knowledge expression is combined with condition of inference to carry out the overall design and emulation and reference.The paper gives the ways through which the functions can be achieved, gives the modularization of reference and the design methods of systematization, puts forward the method of knowledge expression and working interface, and supplies a platform for similar products of the shell category that can be quickly designed.     

Three-dimensional Numerical Simulation of Combustion Field in the Combustion Chamber

In order to study the effect of rotation on the combustion in the underwater vehicle, a two-phase turbulent combustion process is described with Reynolds stress turbulence model, eddy-dissipation turbulent combustion model, P-1 radiation model and particle tracking model of liquid. The flow in the rotating combustion chamber is simulated at two different working speeds, 0 r/min and 1 000 r/min by Fluent software. The temperature, gas velocity, static pressure of wall and fuel concentration are computed and compared. The results show that the combustion in rotating combustor is faster and more effective.     

Software Communication Architecture Implementation and Its Waveform Application

This paper attempts to do a research on the development of software defined radio（SDR） based on software communication architecture（SCA）. Firstly, SCA is studied and a whole reference model of SCA3.0 core framework （CF） is realized; Secondly, an application-specific FM3TR waveform is implemented on the platform of common software based on the reference model; Thirdly, from the point of view of real-time performance and software reuse, tests and validations are made on the above realized CF reference model and FM3TR waveform. As a result, the SCA-compliant SDR has favorable interoperability and software portability and can satisfy the real-time performance requirements which are not too rigorous.     

Parameter Identification for the Valve Control Cylinder System of a Hydraulic Manipulator

In mechanical, hydraulic and electronic systems, the determination of system parameters is often challenging because liquid parameters often change significantly, due to variations in working and environmental conditions. Therefore, it is of significant practical importance to identify those parameters through experimental procedures. A systematic approach to identifying parameters in the valve controlling cylinder system of hydraulic manipulators is provided. It first derives the transfer function of the system, and then uses P control of PID control to predict system parameters. The predicted parameters are further validated using PID control. The prediction through simulation using MatLab language is utilized, which agrees well with experimental results.     

Dynamic Simulation of the Tank Gun Recoil Response

By using the ATV module of MSC. ADAMS, the dynamic simulation of recoil response of tank gun is analyzed.How the recoil force affects the bodywork and the suspension during gun firing, as well as the changing status of the gun muzzle‘s velocity are gained. All results and analyzing methods are offered for the designing basis of optimizing tank vehicle-gun match. The constructive exploration is beneficial to improving the general capability of tank.     

Survey of Controllable Suspension System for Off-road Vehicles

The controllable suspension system can improve the performances of off-road vehicles both on road and cross-country. So far, four controllable suspensions, that is, body height control, active, semi-active and slow-active suspensions, have been developed. For off-road vehicles, the slow-active suspension and the semi-active suspension which have controllable stiffness, damping and body height are more appropriate to use. For many years, some control methodologies for controllable suspension systems have been developed along with the development of modern control theory, and two or more original control methods are integrated as a new control method. Today, for military or civilian off-road vehicles, the R&D of controllable suspension systems is ongoing.     

Nitrosation and Nitration of Tetraacetyldibenzylhexaazaisowurtzitane

Tetraacetyldibenzylhitane (TADBIW) was subjected to debenzylation by nitrosating with inorganic materials available commercially to synthesize tetraacetyldinitrosohexaazaisowurtzitane (TADNSIW). TADNSIW was purified, and its structure was determined by FTIR, 1H NMR, MS and element analysis. The debenzylation reaction of TADBIW gave quantitative benzaldehyde as a by-product. This indicates that the reaction produces an imine cation as an intermediate. Hexanitrohexaazaisowurtzitane (HNIW) was prepared from unpurified TADNSIW with the yield over 96.0 % and the purity more than 98.0 %. And the mechanism of the reaction from TADNSIW to HNIW is proposed to be oxidation of nitroso and nitration of acetyl on the molecule of TADNSIW, This reaction system involved is simple, and the reaction can complete within a short time and under mild conditions. The product can be easily to separate and the waste disposed readily.     

An Efficient Key Agreement Framework to MANET

Protocols for key management are compared and evaluated from the point of view on mobile ad hoe networks （MANET）. The issues of fault-tolerance and efficiency of key distribution protocols for group communications in MANET are addressed. Most key distribution protocols existing today are primarily designed for wlre-line networks. These protocols either fail to work as intended or cannot work at all when they are applied to the demanding environment of MANET. Parameters and performance of different protocols are analyzed, and then a fiat is given out, on which new protocols or existing ones are designed and modified, so that they can be robust, scalable and efficient in MANET.     

Finite Element Analysis of Fretting Behavior Between an Engine Cylinder Block and a Main Bearing Cap

The finite element analysis of the fretting behavior between a cylinder block and a main bearing cap is presented. The stresses, relative fretting slip, fretting friction work parameter W and crack initiation location parameter G on the fretting contact surface of the cylinder block are obtained and analyzed. It shows that the fretting fatigue problem of the cylinder block can be quantitatively explained by W or G. The effects of pretightening force, friction factor and material combination of the cylinder block and the main bearing cap are studied. The computational results indicate that the fretting fatigue of the cylinder block can be allayed by increasing the elastic modulus of the cylinder block, but not by changing the other two factors.     

A Physical Model of Electromagnetic Force from PEMA Acted on Metal Projectiles

Electromagnetic armor is a new conceptual combat vehicle technology, which improves remarkably the defensive capability and maneuverability of vehicles. The authors present definitely to apply the electromagnetic theory to analyze the electromagnetic armor. Based on electromagnetics, the experienced expression of projectile and the physical model of PEMA （passive electromagnetic armor） are obtained when electric current flows through the system, and a computer sim- ulation is given.