造型粉流动性能对分步压装工艺的影响

为研究造型流动性对分步压装工艺适应性及其装药安全性的影响,测量了不同配方造型粉的流散性和堆积密度,通过分步压装工艺试验,研究炸药的流动性对分步压装工艺及其安全性的影响。结果显示,炸药的流散性在一定范围内才能适合分步压装工艺,降低炸药的流散性,可提高局部装药密度,但增加了径向密度差,降低了装药过程的安全性。在流散性适宜的条件下,分步压装装药密度随堆积密度的增加而增加。     

不同粘结剂制备的分步压装用炸药对撞击感度的影响

为研究粘结剂对分步压装装药过程产生热量的影响,设计了以高聚物和石蜡为粘结剂的2种分步压装炸药,分别测试了高聚物和石蜡的粘度,并对这2种炸药造型粉及药柱的撞击感度进行了研究。研究结果表明,采用高聚物做粘结剂制备的分步压装炸药在装药过程中产生的热量明显大于石蜡做粘结剂制备的分步压装炸药,即粘结剂类型对分步压装装药工艺的安全性具有重要影响。     

高聚物黏结粉末分步压装成型件性能研究

为获得高聚物黏结粉末分步压装成型技术条件,主要研究了工艺条件对分步压装成型件性能的影响,探索了分步压装成型技术特点。结果说明,分步压装成型界面清晰,无裂纹等质量缺陷,界面结合紧密;而采用一次成型的成型件成型界面比较弯曲、不规则;分步压装可以有效改善模压法一次成型的装药质量,解决模压法成型件的轴向密度均匀性问题,有效提高装药质量;分步压装的预成型压力值对成型件界面的影响非常重要,预成型压力值应为成型压力的45%～60%。     

压药工艺参数对成型药柱质量的影响研究

为解决弹药压装法技术中关键工艺参数的选择与控制问题,对影响药粒压制成型质量的因素进行研究.以PBX炸药为例,采用试验和仿真相结合的方法,结合炸药的特性,将PBX炸药粉末简化成有限个包覆有粘结剂的HMX球形颗粒,建立炸药体系的3维细观模型,对压药过程进行有限元仿真模拟,得出压力和保压时间对药柱质量产生影响的规律.结果表明:该研究可为弹药装药的研制与生产提供参考,具有一定的实用价值.     

含铝炸药装药工艺装备现状与发展趋势

铝粉具有较高氧化热、来源广泛等优点,用于含铝混合炸药,可大幅度提高炸药爆热。笔者对含铝炸药的各种装药方法的工艺与设备、国内外现状及发展趋势进行研究。介绍压装法(分步压装法)、浇注固化法以及双螺杆捏合柔性挤压法等装药技术,分析国内外现有技术,以及对固态含铝炸药压装药、含铝炸药浇注固化装药及含铝炸药双螺杆挤压装药的处理方法,并阐述了含铝炸药装药发展趋势,提出我国在该技术领域发展重点和措施的建议。该研究可为含铝炸药装药技术的发展提供参考。     

分步压装装药工艺参数对装药密度及密度分布的影响

用模拟药和可退模开合弹对不同分步压装装药工艺参数进行实验,并对装药密度和轴径向密度分布进行检测,分析分步压装工艺参数变化对最终装药密度和密度分布的影响。试验结果表明:随着螺杆直径的增大,周边和平均装药密度均呈上升的趋势;装药过程中初始压力越高,越有利于提高装药密度和密度分布,当压力达到一定值后,装药密度趋于一致;螺杆距弹体底部间距越小,底部越容易压实,密度越高;螺杆每次带入的进料量越少,压制次数越多,密度均匀性越高。该研究为加快分步压装装药工艺的推广应用打下了基础。     

压制密度及密度均匀性对装药撞击安全性的影响

为了研究装药密度对撞击安全性的影响,针对A-Ⅸ-Ⅱ炸药、B炸药、HMX基含铝炸药压制了不同密度的药柱.用A-Ⅸ-Ⅱ炸药压制了径向呈一定密度分布的药柱,利川400 kg落锤进行了撞击加载试验.结果显示,随着密度的增大,A-Ⅸ-Ⅱ炸药、B炸药、HMX基含铝炸药的起爆阈值增加.对于A-Ⅸ-Ⅱ炸药,当装药密度达到1.680 g...     

基于三维打印技术的纳米奥克托今与梯恩梯熔铸炸药制备及性能研究

为解决传统熔铸炸药缺陷多、密度低、力学性能差等问题,将三维(3D)打印技术应用到熔铸炸药的成型制备中。采用自主研发的熔铸炸药3D打印成型原理样机,通过筛选熔铸炸药配方、优化工艺参数,成功打印出含纳米奥克托今和梯恩梯的熔铸炸药药柱。对打印的药柱以及传统浇铸的药柱进行了微观结构、密度和均一性、抗压强度以及爆速等性能表征对比。结果表明：3D打印成型的药柱结构密实,密度为1.65 g/cm³,提高2.0%;抗压强度为5.56 MPa,提高273%;爆速为7 184 m/s,提高2.1%;综合性能明显优于传统浇铸成型的药柱。     

压力注装装药工艺在药柱生产中的应用

介绍了压力注装装药工艺的使用条件、理论依据、原理应发展情况。这种工艺可以提高大尺寸药柱的内在质量，药柱成型性好，而且密度分布均匀，工艺过程短。对改进装药工艺来讲，有一定的参考价值。     

一种大口径战斗部分步压装药有限元模拟与实验

为提高大口径弹药分步压装药效率,对某大口径战斗部分步压装药进行有限元模拟与实验。根据分步压装特点制定针对某大口径战斗部的分步压装工艺流程,采用ANSYS有限元模拟方法分析装药过程中弹壁与导爆管与变形受力情况,开展工艺试验制定工艺参数,采用相应的工艺参数进行大口径战斗部分步压装高能炸药。结果表明,装填结果完全满足××大口径战斗部的装药质量要求。     

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.     

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.     

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.     

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.     

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.     

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.     

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.     

The Kinematics Analysis of the Hydraulic Mine-clearing Mechanical Manipulator

Through analyzing the kinematics of the hydraulic manipulator operating system, according to the rules for set-ing up the D-H coordinate system, the generalized coordinate of the manipulator system is established. The rotating and moving joints are selected from the mechanism as joint variables. Each generalized transformation matrix of joints is worked out. The kinematics equation at the finger end of the manipulator is calculated. The obverse solution for the manipulator is gained. The geometrical operating parameters and primary technical specification of the manipulator system are simulated through the computer. The simulative result has shown that the manipulator operating system meets the working task requirements. This research provides theoretical basis for optimizing structural parameters of the manipulator operating. So it also is justified the feasibility for mechanical manipulators to be used in the engineering equipment platform of the hydraulic excavator.