Ni-Cr薄膜换能元刻蚀工艺研究

为得到刻蚀效果好的Ni-Cr薄膜换能元,研究了刻蚀液的配比对刻蚀时间及金属桥膜换能元参数的影响。结果表明:在硫酸高铈的量一定的情况下,当V_(高氯酸):V_水为17:100时,刻蚀效果较为理想,制作的Ni-Cr薄膜换能元桥区尺寸与设计尺寸的偏差控制在了0.9%以内,并在10V、47μF条件下能够发火。     

Ni-Cr薄膜换能元点火性能研究

针对微火工品和微推进器集成化的发展需求,以及制作工艺与MEMS、半导体工艺相兼容并能实现低能发火的要求,对Ni-Cr薄膜换能元进行了研究,设计制作了几种不同桥区尺寸和薄膜厚度的Ni-Cr薄膜换能元,并对其电发火性能进行了测试.结果表明:在同一桥区尺寸的条件下,Ni-Cr薄膜发火感度随桥膜厚度的增加而升高;在相同的桥膜厚...     

陶瓷基体表面粗糙度对Ni-Cr薄膜换能元性能的影响

研究了Al2O3(95%)陶瓷基底的粗糙度对Ni-Cr(80/20)合金薄膜及薄膜换能元性能的影响.利用磁控溅射法在不同粗糙度的基底上制备了Ni-Cr合金薄膜.通过扫描电镜、划痕法、4探针法对薄膜的微观结构、附着性能、电性能进行了研究.根据D-最优化法测定了基底粗糙度不同的薄膜换能元爆发电压、爆发电流.结果表明:随着基...     

桥区参数对Ni-Cr薄膜换能元发火性能的影响

依据GJB/z 377A-94感度试验川兰利法,对设计制作的不同桥区参数的Ni-Cr薄膜换能元进行了发火感度测试.结果显示:当桥区尺寸、形状一定时,随着桥膜厚度的增加,换能元的发火电压减小,当桥膜的厚度增加到0.9μm,换能元发火电压又有增加的趋势;当桥膜厚度、桥区形状一定时,随着桥区宽度减小,发火电压降低,但当桥区宽度小于0.10mm时,发火电压反而上升;当桥膜厚度、桥区宽度一定时,桥区长度越长,发火电压越高,而且不同桥区形状对换能元发火感度有明显的影响.     

钝感Ni-Cr金属桥膜换能元的制备及性能

采用磁控溅射技术设计加工了一种满足钝感电火工品的Ni-Cr金属薄膜桥换能元,在起爆桥区中心涂抹三硝基间苯二酚铅,对其进行了安全电流、抗静电性能、断桥时间、作用时间的测试,并与半导体桥换能元、桥带式换能元进行了性能对比。结果表明,电阻为(1±0.1)Ω时,在相同散热条件下,该Ni-Cr金属薄膜换能元安全性较其他两种换能元裕度大,作用时间、断桥时间介于半导体桥和桥带式换能元之间,采用5 A发火,引爆三硝基间苯二酚铅的作用时间小于1 ms。     

氮化钽换能元的制备工艺研究

开展了一种制备氮化钽换能元的工艺研究,利用射频电源溅射氮化钽薄膜,采用剥离工艺制备氮化钽换能元图形,获得满足完整性、一致性和重复性要求的氮化钽换能元。依据GJB/z377A-94感度试验用兰利法,测得氮化钽换能元发火能量为0.6m J。     

厚度对MEMS换能元薄膜电阻率的影响研究

为完善微机电系统(Micro Electro-Mechanical Systems,MEMS)火工品薄膜换能元设计理论,减小微尺度下换能元参数的设计误差,保证设计电阻及MEMS火工品的作用性能,理论分析了微尺度下薄膜电阻率的影响因素,采用磁控溅射进行了不同材料(Al、W、Cr、Ni-Cr)、不同微纳米厚度(2μm)薄膜的制备,并对不同厚度薄膜的电阻率参数进行表征,揭示了微纳尺度下电阻率的尺度效应规律,获得了相应的拐点数据。     

一种Ni-Cr@Al/CuO钝感含能元件的制备及性能

为了提高Ni-Cr薄膜发火件的安全性和点火能力,使用磁控溅射技术将Al/CuO含能薄膜与Ni-Cr薄膜发火件复合,制备了一种新型的Ni-Cr@Al/CuO钝感含能元件。该Ni-Cr@Al/CuO钝感含能元件既可以用作换能元,又可以作为最简单的电点火元件,从而简化点传火序列,适应弹药微型化的发展需求。测试其1A1W5min安全性、电发火感度和点火能力。结果表明,Ni-Cr@Al/CuO钝感含能元件满足1A1W5min安全性要求;50 ms临界发火电流为3.08 A,最小全发火电流为3.18 A,最大不发火电流为2.98 A,安全裕度较高;在相同条件下,Ni-Cr@Al/CuO钝感含能元件可以点燃硼/硝酸钾,并且可实现1 mm的间隙点火,而Ni-Cr薄膜发火件不能成功点燃硼/硝酸钾。     

Al/CuO含能薄膜换能芯片薄膜反应的模拟分析

为了探究含能薄膜在换能元火工品点火过程中的点燃机制,建立Al/CuO含能薄膜换能芯片结构的傅里叶传热模型,利用COMSOL仿真软件对不同电压或电容条件下含能薄膜换能芯片的点火过程进行数值模拟,对比分析电容或电压对含能薄膜温升曲线的影响。仿真结果表明：提高电压或电容使得含能薄膜温升曲线峰值增高或延长,两者都能扩大薄膜反应区域;电容与电压增大或减小均影响半导体桥对含能薄膜的传热效率,导致含能薄膜的温升曲线相对于半导体桥具有滞后性与相似性。     

多层含能薄膜的制备及性能表征

本文通过设计硼钛多层复合薄膜结构来提高桥箔的点火能力.利用磁控溅射法交替沉积钛和硼制备多层含能薄膜,单层厚度分别为230 nm和250 nm.对含能薄膜进行X射线衍射图谱测试,结果显示其成分为Ti和B单质状态,并采用HS4540MX12高速运动记录系统记录含能薄膜点火过程,结果表明火花溅射距离可达到30 mm左右.可以推断多层含能薄膜用于制作桥膜可提高火工品的点火能力.     

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.