某火工品老化性能评估研究

在温度为60℃、相对湿度为95%的加速老化试验条件下,对某火工品的单发作用时间变化情况进行了研究。研究结果表明,随着老化时间的延长,其单发作用时间均值也延长,且在加速老化21天、35天和45天,被测样品的单发作用时间最大值呈线性增长;当加速老化到56天,该火工品被测样品的可靠度降低为98.98%,当老化到67天,其可靠度降低为15.06%。     

材料老化对火工品性能影响研究

为了掌握某火工品材料老化对其性能的影响,采用高温加速老化试验,对其电极电阻及PETN炸药粉末比表面积在老化过程的变化情况进行了测试分析,并通过该火工品单发作用时间测试,研究了电极及PETN粉末老化对其性能的影响。结果表明:在高温加速老化过程中,该火工品电极电阻无显著性变化,其装配成的火工品单发作用时间也无明显变化,但其PETN炸药粉末比表面积随老化时间延长出现了明显下降,采用经不同时间老化后的PETN装配火工品,测得单发作用时间随比表面积减小而延长。     

RDX基浇铸PBX的老化性能

采用-55~71℃温度循环老化试验,研究了RDX基浇铸高聚物粘结炸药(PBX)老化时,随时间的外观变化、结构完整性、质量/体积变化率、机械感度、力学性能及发射安全性。进行了65,75,85,95℃老化试验和老化样扫描电镜(SEM)及动态力学分析(DMA)的研究。结果表明,25个温度循环后,PBX炸药装药内部无可见裂纹和气孔,结构完整性未发生变化,质量/体积变化率小于1%,撞击感度增加到16%,在锤重400 kg和落高3 m的撞击条件下,未发生爆炸,PBX的抗压强度增加、压缩率下降,力学性能显著劣化。65℃恒温老化252 d后,抗压强度增加47.5%,压缩率下降9.8%。随老化时间延长,β松弛的动态力学损耗峰值(tanδ)降低,网络交联程度提高,与填料之间的结合更为紧密,显示后固化交联反应是力学性能劣化的原因之一。     

电爆管失效模式及影响因素研究

采用加速老化试验技术,在温度为71℃和温度为71℃、相对湿度分别为50%和80%条件下,对某电爆管在老化过程中的失效模式进行了研究。结果表明,老化后,该电爆管压敏电压值均较老化前降低,尤其是经含有湿度的双因素加速老化试验后,其压敏电压值下降更明显,而其电阻、发火时间、输出气体压力等性能指标却无明显变化。通过对电爆管压敏电压下降影响因素研究,结果发现,灌封胶配制不均是导致其压敏电压值在湿度环境中下降的主要原因。     

加速老化对RDX基压装PBX炸药性能的影响

为研究聚丁二烯橡胶(BR)粘结剂在老化过程中对黑索今(RDX)基压装高聚物粘结炸药(PBX)性能的影响,采用71℃高温加速老化试验,测试了老化前后药柱的质量、体积、真空安定性、力学性能和机械感度,利用扫描电镜(SEM)和X射线光电子能谱(XPS)观察了炸药微观结构、元素含量和化学环境的变化情况。结果表明,经过高温长贮后,药柱体积和质量的变化率都小于1%,未见裂纹等明显缺陷;抗压强度增加74%,抗拉强度增加117%,撞击感度从8%降至4%,摩擦感度从18%降至8%;高温老化过程中炸药的安定性没有发生明显的变化。分析认为,在加速老化过程中,由于碳碳双键的不稳定性,药柱中的BR粘结剂发生氧化交联反应,使交联度提高,并受热软化、铺展,分布均匀化,使包覆和粘结效果增强,从而提高了炸药的力学性能并降低了机械感度。     

含改性氯酸钾烟火药剂的安全性研究

为了研究含改性氯酸钾的烟火药剂的安全性,采用绝热加速量热仪、撞击和摩擦感度仪等,对由改性前后氯酸钾组成的烟火药剂的热安全性和摩擦感度、撞击感度进行了对比测试.结果表明,含改性氯酸钾的烟火药剂初始放热温度提高了36.08℃;达到最大放热速率的时间延长了6倍多;单位质量最大压力减小了0.63MPa·g-1;绝热温升降低了95.99℃;摩擦感度降低了64%,撞击感度降低了72%.含改性氯酸钾组成的烟火药剂安全性明显提高.     

某电爆管贮存老化性能研究

为了研究某电爆管在贮存过程中的性能变化情况,采用加速寿命试验的方法,在温度为71℃和温度为71℃、相对湿度为50%的加速老化试验条件下,对该电爆管的性能变化情况进行了试验研究。试验结果表明,除了该电爆管压敏电压受环境湿度影响较明显外,其电阻、发火时间及输出气体压力均在设计技术指标范围内。     

加速老化对电火工品电阻与发火时间的影响

试验测定了不同加速老化时间电火工品的电阻与发火时间,分析确定了影响电阻与发火时间变化的原因与规律。选择了80发试验样品,在90℃温度下对其进行加速老化,测定了老化过程中桥丝电阻的变化,最后对不同老化时间后试验样品的发火时间进行了测定。试验与分析表明：由于药剂对桥丝的氧化,样品的桥丝电阻可增加2％以上;由于药剂的分解使其能量下降,样品的发火时间增长,出现迟发火和瞎火。     

不同加速寿命时间点上不同桥丝材料电阻变化研究

在恒定温度、湿度的条件下,研究了镍络丝和金丝两种不同桥丝材料的电极电阻在加速寿命试验后各个不同贮存时间点的变化情况,并对不同寿命时间点的电阻均值进行t-显著性检验。研究结果表明,金丝电极电阻在室温下贮存20天及在温度(50±2)℃、湿度95%条件下贮存9天、14天和21天后都较初始电阻有显著性变化,而镍铬丝电极电阻却变化不明显。     

一种电容储能焊接火工品泄漏率变化规律研究

为了解长期贮存对储能焊接火工品密封性能的影响,对不同焊接设备装配的产品进行老化试验前后的泄漏率测试,通过开展不同时间的老化试验,分析老化时间对产品密封性能的影响。结果表明:老化环境会对储能焊接火工品的密封性能造成一定程度的影响,并且随着老化时间的增加,火工品的密封性能出现显著的降低,甚至无法满足国军标的要求。后续工作中需要对焊接产品结构、焊接工艺参数进行系统研究,以期提高储能焊接火工品在长期贮存条件下的密封性能。     

Open Rule-setting System Applied to Conceptual Design of Engines

Open rule-setting method advanced in this paper concentrates on providing designers of engines with a convenient way to express their design innovations and develop the expected prototypes in the early CAD stage, and constitute effective models for the following analysis process of CAE and CAPP. The problems arisen in the process of conceptual design with the traditional experience-based development method are analyzed. Based on those analyses, open rule-setting method is presented and some associated technical problems are discussed. The functional framework of open rule-setting system was built as software engineering methods. The speciality of the engine product as a kind of complex product and the requirement of the engine product based on its structural particularity to rule-setting system are considered carefully. A demonstration is supplied to illustrate how the open rule-setting method enhances the efficiency and quality of the engine conceptual design.     

Research on Linux Network Device Driver

By analyzing the working principle of Linux network device driver, discussing the Linux network driver structure and its key technologies, the general network driver structure and its design methodologies in Linux system are summarized. Through modifying the network device driver of Linux device driver 3rd version snull, c and improving the COW technology, the Zero-Copy technology in Linux （kernel version 2.6.11 ） is implemented. In the end, the success test tells us that the thorough analysis of network device driver is the foundation of many applications, and it also provides a certain improvement to a lot of real applications, even to military application development.     

Algorithm for Multi-laser-target Tracking Based on Clustering Fusion

Multi-laser-target tracking is an important subject in the field of signal processing of laser warners. A clustering method is applied to the measurement of laser warner, and the space-time fusion for measurements in the same cluster is accomplished. Real-time tracking of multi-laser-target and real-time picking of multi-laser-signal are introduced using data fusion of the measurements. A prototype device of the algorithm is built up. The results of experiments show that the algorithm is very effective.     

Influence of Installing Error on the Surface Shape Precision of the Axial Symmetry Aspheric Workpiece in Lapping

A method to calculate the surface shape error, which is caused by the installing error between the workpiece and the lapping tool in the process of form lapping, is proposed. The mathematical model which the installing translation error influences on the workpiece surface shape error is established. The changing rule of the error is simulated through the calculating example of the paraboloid workpiece. The results indicate that the surface shape error of the workpiece is increasing with the increase of the installing translation error, it is also increasing gradually along the center point of the curve surface to the edge, and the influence is severer to the curve surface with great curvature than that of the small curvature when the translation error is the same.     

Experimental Research on Output Performances of Giant Magnetostrictive Actuator

The paper introduces the performances of magnetostrictive actuators and its applications, discusses the design methods for the structure and internal magnetic circuit of a giant magnetostrictive actuator, and makes tests on the output displacement and force characteristics for an actuator using homemade magnetostrictive material. The experimental result shows that the actuator has satisfactory output precisions and ranges in transient and stable states, and can be used in lowfrequency vibration control system of precise equipment.     

Overview of Anti-tank Mines

First the different anti-tank mines laying possibilities are shortly summarized： hand emplaced, with mine layers, ground or helicopter relatively topographical well defined, and with cluster systems of projectiles, rockets and aircraft dispensers. Then examples of the three generations of anti-tank mines are presented：Ⅰ generation： detonating only beneath the track; Ⅱ generation： detonating beneath the track and belly; Ⅲ generation： mines with off-route actions. Weight and cost comparisons are strongly favoring the off-route Ⅲ-generation mines.     

A Finite Element Analysis on Static Strength of a Complex Section

A static finite element analysis （FEA） of an impulsive controller section is presented. The boundary condition and a part of the loads are applied. Considering the grades of the stress around the holes being large, the dense grids are adjusted accordingly. Four cases with different loads are compared, thus the influences of different loads on the section are analyzed. Numerical results show that the maximum stress of the section is lower than the strength limit of the material, and the section will not be broken with the static loads.     

Discussion on Mechanism of Breech-Blow Caused by Propellant Charge

From the view point of launch safety caused by fracture of propellant charge, this paper points out that the safety criterion of pressure wave is inadequate to evaluate the launch safety of propellant charge based on the initial negative differential pressure and sensitivity tests. Generally, the maximum barrel pressure does not depend upon the intensity of pressure wave correspondingly. The pressure wave intensity can not describe the fracture degree of propellant charge in chamber and reflect the mechanical environment of propellant charge fracturing exactly and wholly. The evaluation criterion for launch safety of propellant charge should be built on the basis of depicting the fracture degree of propellant bed.     

Experimental Studies of Toxicity on HNIW and Its Intermediates

The polycyclic nitramine hexanitrohexaazaisowurtane（HNIW） is a compound of high energy density. HNIW can replace 1, 3, 5-trinitro-1, 3, 5-triazacyclohexane（RDX） or HMX, hut its toxicity is unknown. In this paper, HNIW, hexabenzylhexaazaisowurtzitane （HBIW）, tetraacetyldibenzulhexaazaisowurtzitane （TADBIW）, tetraacetyldiformylhexaazaisowurtzitane（TADFIW） and tetraacetylhexaazaisowurtzitane（TAIW）, which are intermediates of the synthesis of the HNIW, were selected as the tested objects in acute toxicity test, acute eye stimulation test and skin irritation test according to the standards of ＂chemical product testing method-401 ： acute oral toxicity test＂, ＂chemical product testing means-405： acute eye irritation/corrosion test＂ and ＂chemical product testing means-404： acute dermal irritation/corrosion test＂ of National Circumstance Protect Bureau. The results show that all of the five objects have no toxicity, no stimulation to eye and skin under the tested conditions.     

Dynamic Simulation for Missile Erection System

In order to study the dynamic characteristics of the missile erection system, it can be considered as a rigid-flexible coupling multi-body system. Firstly, the actual system is abstracted as an equal and simplified one and then the forces applied to it are analyzed. Secondly, the rigid-flexible coupling dynamic simulation for erection system is accomplished by use of the system simulation software, for example Pro/E, ADAMS, ANSYS, MATLAB/Simulink, etc. Finally, having the aid of simulation results, the kinetic and dynamic characteristics of the flexible bodies in erection system are analyzed.The simulation considering the erection system as a rigid-flexible coupling system can provide valuable results to the research of its kinetic, dynamic and vibrational characteristics.