低速陶瓷球侵彻明胶研究

为研究低速陶瓷球侵彻明胶运动规律,通过试验和数值模拟方法,测量了不同直径陶瓷球的冲击速度和侵彻明胶深度; 采用能量守恒模型,计算球形破片侵彻明胶深度; 结合试验结果与理论结果进行验证计算。研究发现:对于球形破片侵彻明胶,利用该文的理论分析模型计算出的侵彻深度与试验结果吻合较好; 基于理论模型的可靠性,发现低速陶瓷球侵彻明胶,其直径是影响侵彻深度的主要因素; 将陶瓷球、钨球、钢球的侵彻能力进行对比,综合考虑侵彻深度和最大空腔半径,结果表明陶瓷球更适合作为毁伤元。     

基于瞬时空腔效应的明胶靶标与肌肉目标等效性研究

明胶靶标作为肌肉目标模拟物被广泛应用于瞬时空腔效应相关理论和实验研究,建立明胶靶标与肌肉目标瞬时空腔效应的等效关系,对明胶靶标的推广应用具有重要意义。分析了瞬时空腔形成的物理过程,找出了影响瞬时空腔尺寸的主要物理参数;利用相似理论推导出瞬时空腔效应的相似准则方程,并基于不同靶标实验数据求解出方程系数,从而建立了明胶靶标与肌肉目标的空腔效应等效模型;通过球形破片侵彻猪后腿的实验验证了该等效模型的准确性,模型预测的最大瞬时空腔直径与实验相对误差小于4.0%.     

钢球侵彻明胶靶标相似性分析

为了描述杀伤元直径与受损目标的最大瞬时空腔直径之间的关系,采用量纲分析方法建立了钢球侵彻明胶的相似模型,分析了钢球侵彻明胶造成的瞬时空腔的最大直径的相似律,得到了一套基于相似理论的缩比实验方法及瞬时空腔最大直径的预测公式。采用不同直径的钢球对明胶靶标进行了侵彻创伤实验,结果表明,在特定情况下,该文提出的缩比实验方法及瞬时空腔最大直径的预测公式具有高的预测精度。     

钨球及六棱钨柱破片侵彻Q235叠层靶特性研究

为研究破片形状及质量对其侵彻性能的影响和靶板分层方式对其抗侵彻性能的影响,采用12.7 mm标准弹道枪发射质量为8.05 g、直径为9.4 mm的钨球以及质量为12 g、尺寸为内切圆Φ 9 mm×9.5 mm的六棱钨柱,分别撞击材料为Q235的3种不同结构靶板。通过试验和R-I公式得出了钨球及六棱钨柱破片侵彻3种不同结构Q235靶的弹道极限。在此基础上,验证了选用模型及参数的有效性;并采用数值模拟方法研究了相同质量下两种不同形状破片侵彻Q235靶性能的差异性。研究结果表明,破片侵彻靶板的性能不仅与破片形状、靶板分层结构有关,还与破片侵彻靶板的速度以及破片质量有关。六棱钨柱侵彻靶板性能与其着靶姿态以及靶板结构有关。在质量相同以及一定侵彻速度的条件下,球形破片侵彻靶板的能力高于六棱柱破片,叠层靶比相同厚度单层靶能够提供更好的抗六棱柱破片侵彻的能力。     

基于球形杀伤元运动特性的明胶靶标标定方法研究

为研究使用明胶靶标对杀伤元进行杀伤威力评估的工程方法,分析明胶靶标的材料力学性能,在实验研究的基础上,结合瞬态动力分析软件对球形杀伤元在明胶介质中的运动规律进行了分析研究。研究结果表明：在使用明胶靶标进行威力实验前,应对靶标材料特性进行标定;球形杀伤元在明胶介质中高速运动时会产生空腔现象,最大空腔直径会随着侵彻深度的增加而增大,杀伤元的速度、阻力均以指数形式衰减;杀伤元以中高速（300～1 000 m/s）侵彻明胶靶标时,可将明胶靶标简化为流体模型。通过实例分析、计算,建立了速度与位移的数学关系,确定了明胶靶标的标定方法。研究结果可为杀伤元威力评估和明胶靶标标定提供参考。     

不同形状预控破片成形及毁伤效应研究

为了研究破片形状对破片飞散规律以及侵彻效能的影响,利用三维有限元分析软件ANSYS/LSDYNA对截面为三角形、正方形、菱形以及正六边形的外部刻槽式预控破片战斗部成形过程进行模拟分析,同时对破片侵彻靶板过程进行数值计算。研究结果表明,正六边形破片的预控效果最好;破片形状对破片初速和质量损耗的影响较小;通过破片侵彻钢靶的数值模拟,得出在初速和质量相同的情况下,截面为正六边形、正方形、菱形、三角形的破片杀伤威力由强到弱。     

步枪弹对带软硬复合防护明胶靶标的侵彻机制研究

为研究步枪弹对带软硬复合防护明胶靶标的侵彻机制,采用有限元分析软件ANSYS/ LS-DYNA建立步枪弹侵彻复合靶标的数值模型。通过该模型模拟了侵彻过程中的钝性冲击现象和明胶瞬态响应,并进行了试验验证。研究结果表明：步枪弹侵彻陶瓷板过程中消耗了弹头大部分能量;明胶内瞬时空腔呈现椭球形基本形态,空腔最大凹陷深度和膨胀速度分别为25.6 mm和35.7 m/s;压力波在明胶内以球面波形式向外传播,在弹着点处峰值压力最大,且压力幅值随着传播距离的增大而不断减小;弹头速度先有一段明显的下降过程,而加速度绝对值则先增大,随后它们都逐渐衰减至0 m/s和0 m/s²;陶瓷板的破坏主要是由拉应力和压应力的反复作用造成的;数值计算结果与试验结果的一致性较好,验证了数值模拟模型的准确性。     

钨破片侵彻舰艇装甲薄弱部位毁伤效能评估

模拟了末端制导反舰导弹在侵彻舰艇装甲时末制导弹爆炸模型,得出破片飞行的初速度,再通过 ANSYS/LS-DYNA进行不同速度和质量及形状的钨合金破片侵彻装甲薄弱部位的数值模拟,得出高速自锻破片能够对装甲毁坏,但会使装甲出现反弹,侵彻深度不及中等速度破片;尖头破片出现较大应力集中,未到侵彻深度会使破片破坏;得到毁坏薄装甲的最小破片质量,为薄弱装甲防护提供了参考。     

装填材料对PELE侵彻混凝土效能影响研究

为研究惰性装填物对PELE侵彻混凝土靶板效能影响,利用有限元软件LS-DYNA对不同惰性装填物的PELE侵彻混凝土靶板进行数值模拟。结果表明:与PELE侵彻混凝土靶板相比钢靶的形成破片质量较大、速度较慢;不同装填物对靶板的破坏效能不同;尼龙装填物比橡胶对靶板破坏的面积大,破片数量多。通过实验验证了模拟结果的正确性和可靠性。     

柱形破片对多层间隙靶侵彻试验研究

对钨合金柱形破片侵彻多层铝合金间隙靶板进行了试验研究,模拟预制破片弹中杀伤元对目标的侵彻特性.分析了破片质量、着靶速度对多层靶板侵彻能力的影响,获得了基础试验数据,并结合工程计算模型,拟合得到了靶板侵彻层数随破片质量、着靶速度的数学方程.该拟合方程可用于评估长径比为1且正侵彻的钨柱形破片的侵彻能力,对预制破片弹的破片选择提供实用参考.     

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.