偏心起爆定向战斗部威力研究

为研究偏心起爆定向战斗部毁伤威力,推导了偏心起爆点对侧延长线附近有限角度内应用的偏心起爆破片初速公式,并设计钨柱和钨球两种预制破片偏心起爆定向战斗部进行了试验验证。结果表明,所推导公式可用于偏心起爆定向战斗部计算。设计的偏心起爆战斗部的速度增益,钨柱破片为10.9%,钨球破片为19.8%。钨球破片初速、破片球面分布密度、毁伤概率均高于钨柱破片。     

杀伤爆破战斗部起爆方式对地面目标杀伤威力的影响

为提高杀伤爆破（简称杀爆）战斗部对地面目标的毁伤威力,利用靶场静爆试验和数值模拟方法开展了序贯起爆网络下的定向战斗部威力研究。基于LS-DYNA有限元程序分析不同起爆方式下杀爆战斗部的破片飞散规律,编写C语言程序获得有效破片落地时的分布密度和能量分布,结合毁伤概率法计算战斗部在落角、落速、落高不同运动参数下的有效毁伤面积。研究结果表明：偏心两线和偏心三线序贯起爆在定向方向的速度增益为20.3%、19.8%,序贯起爆可有效改善破片的飞散角,提高破片的落地动能和密度,进一步提高战斗部毁伤面积;偏心两线序贯起爆时战斗部的毁伤效能最高,有效毁伤面积增益最高可达809.1%;该毁伤面积计算方法可较好地反映出破片密度和动能对毁伤效能的影响,为不同起爆方式下杀爆战斗部的毁伤评估提供参考。     

滑块式定向战斗部增益研究

为提高战斗部在目标方向上的破片密度,设计了一种新型滑块式定向战斗部。建立了该滑块式定向战斗部与普通偏心起爆定向战斗部的有限元模型,运用数值模拟和静爆试验相结合的方法研究了该定向战斗部的破片数目和速度增益。结果表明,该滑块式定向战斗部与相同质量和装药量的普通偏心起爆定向战斗部相比,在定向方位90°角度范围内破片数目增益38.8%,初速减小3%。     

爆轰波定向战斗部起爆参数研究（英）

为了优化爆轰波定向战斗部的性能,研究了不同的偏心起爆形式.利用试验验证过的流体动力学仿真模型研究了偏心一线起爆不同起爆点数、偏心两线不同夹角和偏心三线不同夹角等对战斗部破片速度、飞散的影响.结果表明:对于本研究对象,在一条起爆线上布置4个起爆点是足够的;对于偏心两线起爆,两线之间夹角60°可在定向侧产生最高的速度增益,达38.37％;同样对于偏心三线起爆,夹角45°时的破片速度增益最大,达39.36％.定向方向的破片速度增益是爆轰到破片的传播距离(时间)和爆轰压力共同作用的结果.     

爆轰波定向战斗部起爆参数研究（英文）

为了优化爆轰波定向战斗部的性能,研究了不同的偏心起爆形式。利用试验验证过的流体动力学仿真模型研究了偏心一线起爆不同起爆点数、偏心两线不同夹角和偏心三线不同夹角等对战斗部破片速度、飞散的影响。结果表明:对于本研究对象,在一条起爆线上布置4个起爆点是足够的;对于偏心两线起爆,两线之间夹角60°可在定向侧产生最高的速度增益,达38.37%;同样对于偏心三线起爆,夹角45°时的破片速度增益最大,达39.36%。定向方向的破片速度增益是爆轰到破片的传播距离(时间)和爆轰压力共同作用的结果。     

偏心起爆方式对棱柱形定向战斗部破片飞散规律的影响

为了研究起爆方式对棱柱形定向战斗部破片飞散规律的影响,采用LS-DYNA软件模拟研究了六棱柱定向战斗部分别用面偏心一线、面偏心两线、面偏心三线、棱偏心一线及棱偏心两线起爆时的破片飞散速度、破片方向角,结果表明,偏心起爆可以明显提高定向区域内的破片飞散速度,且破片束基本分布在25°左右的径向范围内,棱偏心两线同步起爆时,对目标方位破片最大飞散速度增益可达29.73%,采用棱偏心两线序贯延时起爆可使轴向方向角改变量达6.77°。     

影响鱼雷定向战斗部威力的偏心起爆仿真与试验

定向起爆技术可大幅提高鱼雷战斗部的能量利用率,加大对大中型舰船目标的毁伤。基于此,对重型鱼雷定向战斗部缩比样机在3种不同起爆方式下,在相同测点处的冲击波超压进行仿真计算和试验测试,结果表明,战斗部3点偏心起爆方式产生的冲击波超压在一定范围内,在目标方向上较中心起爆方式有所增强,偏心距愈大,冲击波超压增强幅度愈大。因此,3点偏心起爆可作为重型鱼雷定向战斗部优先选择的起爆方式。该文的研究将为优化重型鱼雷战斗部设计提供参考。     

起爆方式对偏心式定向战斗部破片速度分布的影响研究

为了揭示起爆方式对偏心式定向战斗部破片速度分布及增益的影响,文中运用数值模拟的方法对一端起爆、两端同时起爆和线起爆方式下偏心式定向战斗部的爆炸过程进行了研究.研究表明,两端两点同时起爆时破片的速度增益比中心起爆时高28.1%,且高速度破片在周向上的分布角度宽,为最优的起爆方式.     

偏心起爆杆式战斗部爆轰驱动三维数值模拟

利用ANSYS/LS-DYNA3D非线性动力有限元程序对多点偏心起爆杆式战斗部进行数值模拟,得到杆条在不同径向角的速度及压力分布,并得出偏心起爆杆条速度增益及密度增益的影响因素,为定向战斗部的研制提供技术参考。     

偏心起爆周向多爆炸成型弹丸战斗部实验研究

为进一步提高周向多爆炸成型弹丸(MEFP)战斗部的毁伤效能,设计一种偏心起爆MEFP战斗部,制备了中心起爆和偏心起爆两种原理样机,并进行了静爆实验。结合数值模拟方法分析了周向球缺型药型罩形成爆炸成型弹丸(EFP)的成型及飞散过程,模拟结果表明,两点偏心起爆模式下,EFP成型后的长径比更大,且更密实;对两种不同起爆模式下MEFP战斗部的静爆实验结果进行对比,偏心起爆模式能够有效提升EFP毁伤元的平均速度、分布密度和侵彻威力。研究结果表明,两点偏心起爆可以有效提高MEFP战斗部的综合毁伤效能,为MEFP战斗部的设计与应用提供了参考。     

Method for Measuring Velocity of Warhead Fragments Based on Photoelectric Detection

For measuring velocity and impacting position of single fragment of warhead, a non-contact measuring method is proposed, in which a six-light-screen array, a position indicator, a multi-channel chronograph and a computer are used.The principle of measurement is described. The key device of the system is a light screen array sensor which consists of six light screens allocated with certain geometrical parameters. When the fragment flies through the light screen array, the time of passing through each of the screens is recorded by the multi-channel chronograph. According to the time data and the geometrical parameters of the array, the velocity vector and the location of the fragment can be calculated immediately. The presented method can be used to locate the fragment and to measure the real velocity on its flying direction. It can also be used to measure the velocity of a fragment swarm after the system is engineered further.     

数码电子雷管中影响点火头性能因素分析

阐述了数码电子雷管中,点火药剂细结晶三硝基间苯二酚铅（LTNR）的制备工艺;从点火药剂的种类、加入黏合剂的质量分数、桥丝直径、点火头的电阻值、防潮漆的蘸涂等方面对点火头性能的影响因素进行了探讨;通过震动试验、并联起爆试验、延期精度检测与考核,试验结果表明：一次性合成的细结晶LTNR是制造数码电子雷管点火头较为理想的点火药剂,按技术要求生产的点火头性能指标能够满足行业标准要求。     

Stability of the Third Generation Intensifier under Illumination

The stability under illumination of transmission-mode GaAs photocathode sealed in the third generation intensifier is investigated by use of spectral response testing instruments. The variations of spectral response with the illumination times under weak and intense illumination are compared. The variations of photoemission performance parameters are also characterized. The results show that during initial several weak illuminations photocathode behaves no evident decay and a maximum sensitivity is achieved, while under intense illumination the sensitivity of photocathode begin to decrease largely at the first illumination. The calculated performance parameters show that the variation of surface escape probability with illumination times is a direct cause of instability of photocathode. It is also found that under intense illumination peak wavelength is moved towards short-wave and peak response is decreased, which shows that the ability of long-wave response of photocathode is decreased.     

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.     

Design and Implementation of One Missile Visual Simulation System Based on OpenGL

The implementation of a missile＇s visual simulation system is explained that is developed with OpenGL（open graphic library） and the flight path and flight carriage in different stages of the missile are displayed. The establishment problems of the 3D scene are circumstantiated including the construction and redeployment of the model, creation of the virtual scene, setting of the multi-viewports and multi-windows etc. The missile＇s data driver, system flow, the modules and their mutual relations of the missile visual simulation system are discussed. The missile flight simulation results and effect of the scenes are given.     

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.     

Dynamic Encryption Technology in Ad-hoc Networks

A new dynamic encryption application in ad-hoc networks is proposed. The advantages of this method are its being able to use the previous ciphertext as a seed of a new encryption process, rendering the encryption process effective in all communication process by continuous dynamic key generation together with synchronization, and its capability to cut back on system bandages to a greater extent, which is valuable for the ad-hoc circumstance. In addition, the rationality and effectiveness of this novel encryption method have been verified by the test results.     

An Experimental Study on Electro Chemical Machining of Microelectrode

Puts forward a new method in machining microelectrode by electro chemical machining （ECM） and plastic deformed theory. The procedure of this method is to machine the microelectrode according to the basic rule of ECM theory at first. Then, with the change of ECM machining parameters, one of the microelectrode ends is exerted by a load. As a result, the elastic and plastic deformation is produced at the machining section and the microelectrode diameter is reduced. It has been proved that the proposed method can determine the optimum machining parameters to machine the microelectrode of Cu.     

Unscented Kalman Filter for Autonomous Warship Attitude Determination

To address a problem of autonomous attitude determination algorithm using gravitational field and geomagnetic field observation, a new recursive optimization autonomous attitude estimation algorithm is proposed. The algorithm is based on unscented Kalman fiher(UKF), and can synchronously provide the attitude rate information. The simulated results show that the measurement precision of the method could be increased by 2 times compared to that of the common methods.     

Error Coefficient Estimation of Inertial Platformin Its Calibration

The error coefficient estimation of inertial platform in the course of its consecutive ground calibration is studiedA separate-bias algorithm is adopted to estimate the error parameters effectively. The ill-conditioning problem of the equation solution caused by the huge state dimension is also resolved. And the simulation result shows its validity.