动态针刺起爆实验与理论研究的新进展

利用动态模拟装置测试和研究了雷管和火帽两种典型针刺火工品在动态击发条件下的发火性能，获得了动态发火性能试验数据。与落球仪的测试结果及经典公式Ｅｆ＝Ｅｏ．Ｅ＾－０．１ｖ计算结果进行了对比分析。从基本原理出发建立了尖头和平头两种击针在针刺过程中力学模型、戳击速度模型和针刺功率模型，并推导出分析解。     

火工品感度测试动态斜坡法与升降法比较研究

对动态斜坡法与升降法测试原理优缺点进行了比较,在动态斜坡法测试敏感和钝感型电火工品发火感度试验的基础上,结合与升降法试验结果的对比,对动态斜坡法进行了研究。通过改变试件压药条件,利用动态斜坡法能得到火工品发火感度临界值的特性,探讨了压药压力和发火感度之间的关系。结果证明,该方法所需试件数量相对减少,能满足感度试验的要求。初步探索了解决动态斜坡法与现有火工品验收试验之间矛盾的方法。     

火工品可靠性评估小样本试验设计方法

为了实现火工品高可靠性指标的小样本评估,研究了火工品可靠性评估小样本试验设计方案,给出了基于试验信息熵的小样本试验设计方法。采用该方法对用于H/DRl31引信头部击发机构的54号针刺雷管可靠性进行了试验与评估。结果表明,在试验刺激量4.5cm处试验22发产品,全部发火,评估结果与采用1800发大样本试验验证结果一致,该产品达到了置信水平为0.90,可靠度为0.999的可靠性指标。     

基于过载冲击下的针刺延期火工品性能

采用分离式霍普金森压杆(SHPB)技术研究了过载冲击对针刺延期火工品性能的影响,利用工业CT技术对针刺延期火工品结构损伤进行了分析,结果表明,过载冲击对针刺延期火工品结构损伤与性能影响有明显不同,过载后装药界面发生位移,发火感度降低,延期时间变短,精度变差,但能量输出变化不大。     

电火工品小电流无损检测的可行性

介绍电火工品无损检测的一次试验结果，发现电火工品在大电流作用下的发火时间与其小电流无损检测的输出有关。因此，认为有实现电火工品单发发火性能预报的可能性，并对发火性能预报的两种无损检测方法进行了讨论。     

静电放电刺激对桥丝式电火工品发火可靠性的影响

根据桥丝式电火工品的静电发火数学模型，考虑到ＥＳＤ刺激对药剂剂有效百分含量的影响，计算出在不同ＥＳＤ刺激水平和刺激次数下电火工品的临界发火能量。     

电火工品发火可靠性数字化测试技术研究

为解决部队电火工品发火可靠性测试精度、自动化和数字化程度低的难题,对电火工品发火可靠性检测的数字化测试进行研究。将嵌入式微处理器技术、数调线性电源技术与数字电子测量技术相结合,设计、制造了测试系统的软、硬件。介绍了测试系统组成及工作原理,并根据电火工品的电阻值大小和在规定电参数下是否发火判定电火工品的可靠性。结果表明:该技术能解决部队电火工品发火可靠性测试精度、自动化和数字化程度低的难题。     

碳化硅导电胶对电火工品性能的影响

为了研究碳化硅导电胶中碳化硅与环氧树脂胶配比对电火工品静电防护、绝缘电阻及发火感度等性能的影响,调节了碳化硅与环氧树脂胶的配比,制备了10种不同配比的碳化硅导电胶材料,按照GJB5309.6-2004《火工品试验方法》规定的静电放电试验、绝缘电阻测定方法,测试了未涂敷碳化硅导电胶和涂敷不同配比碳化硅导电胶条件下某制式电火工品的最高静电防护电压、脚壳绝缘电阻以及发火性能参数,获得了碳化硅导电胶对电火工品性能的影响规律。结果表明,碳化硅与环氧树脂胶配比为1.25∶1时,该电火工品的最高静电电压防护能力达到30 kV,能够满足测试电压低于100 V时绝缘电阻值20 MΩ的要求,又不影响产品的发火性能。     

典型火工品超低温安全性试验研究

为测试液氮超低温环境下火工品的安全性能,按照国军标要求,选取3种典型火工品,采用升降法开展了试验研究.将每种火工品分为3组,分别进行常温、超低温和超低温冷冻16h恢复常温后的发火感度及输出威力试验.测试结果表明:对于发火感度,3种火工品在不同试验条件下无本质变化,但仍能够发火;对于输出威力,2种雷管在不同试验条件下无本...     

电流激励Ni-Cr桥带式电火工品发火模型

为优化设计桥带式电火工品,研究了其换能发火模型,基于傅里叶传热定律,建立了Ni-Cr金属桥带电火工品发火的数理模型,并给出了临界发火电流的理论计算方法。在5 min和50 ms恒流激励下,采用D-最优化法测试了两种不同尺寸Ni-Cr桥带的临界发火电流,将测试结果与理论计算值进行了对比,结果表明两者的误差在14%以内,数理模型合理,可用于设计和计算Ni-Cr桥带式电火工品的临界发火电流。     

Nitrosation and Nitration of Tetraacetyldibenzylhexaazaisowurtzitane

Tetraacetyldibenzylhitane (TADBIW) was subjected to debenzylation by nitrosating with inorganic materials available commercially to synthesize tetraacetyldinitrosohexaazaisowurtzitane (TADNSIW). TADNSIW was purified, and its structure was determined by FTIR, 1H NMR, MS and element analysis. The debenzylation reaction of TADBIW gave quantitative benzaldehyde as a by-product. This indicates that the reaction produces an imine cation as an intermediate. Hexanitrohexaazaisowurtzitane (HNIW) was prepared from unpurified TADNSIW with the yield over 96.0 % and the purity more than 98.0 %. And the mechanism of the reaction from TADNSIW to HNIW is proposed to be oxidation of nitroso and nitration of acetyl on the molecule of TADNSIW, This reaction system involved is simple, and the reaction can complete within a short time and under mild conditions. The product can be easily to separate and the waste disposed readily.     

A Robust Algorithm for Watermarking 2D Vector Maps with Low Shape-Distortions

The technique of watermarking has been introduced into 2D vector maps for many potential applications such as protecting the copyright of important GIS （geographical information system） data and tracing the data source of military maps. In most previous works, although the validity of the map data could be preserved during the embedding procedure, the shape-distortions of the map elements are usually neglected which would tend to degrade the invisibility of the watermarking schemes. A shape-preserving algorithm for watermarking 2D vector maps is presented in this paper. A 1D distance sequence extracted from the original map is adopted as the cover data instead of 2D coordinates. A watermark bit is represented by changing the distributions of the cover data. The embedding procedure induces lower shape-distortions than in former works. Experimental results indicate better invisibility of the proposed scheme, as well as its robustness to certain attacks such as map simplification, interpolation, additive noise and most geometric transforms.     

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.     

Improvement and Experiment of the Reamer in Vibra Cutter Against Wave Edge of Titanium Sheet Alloy Parts

By analyzing the influencing factors of part quality making of sheet alloy of titanium by vibra cutter, the shape of upper reamer is set as cylinder and wedge-shaped form, and the lower reamer as plain and hemicycle form, and its main structural parameters are defined as well. Then it is validated further that such improved vibra cutter reamer can be used to process curve-edged parts of titanium alloy sheet. The experimental result shows that the titanium alloy sheet parts processed by above equipment have no sharpen angles for convex parts and evident crevasse of concave-edged part. In summary, such improvement can eliminate the free-waved edge and improve the manufacture quality of titanium alloy sheet parts greatly.     

Experimental Study on the Small Flyer Initiating Behavior of Fine-grained Explosives

The initiating behavior of fine-grained explosives by small flyer is studied. The diameter of small flyer in this device is 1 ram. The test results indicate that the granularity of explosives has great effect on its flyer initiating sensitivity.The flyer initiating sensitivity of the fine-grained explosives is higher and the critical initiating energy is lower than that of common explosives. For common explosive, the flyer initiating sensitivity increases as the density is reduced. But for the fine-grained explosive, the test results are exactly opposite.     

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.     

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.     

Robust Graded Sliding Mode Tracking Control for Low Speed Spinning Ballistic Missiles

The nonlinear dynamic model of spinning ballistic missiles is established during the first boosting phase of the missile. Based on the conventional backstepping sliding mode control and the assumption of a two time-scale separation of missile dynamics, a graded sliding mode controller is designed with two sub-sliding surfaces which have invariability to external disturbances and parameter perturbations, and a matrix which comprises three first order low pass filters is introduced to prevent ＂explosion of terms＂. Owing to the upper bounds of the uncertainties are difficult to obtain in advance, adaptive laws are introduced to estimate the values of the uncertainties in real-time. Eventually, the numerical simulation results given to show the proposed controller can ensure the steady flight of missiles.     

A Study on the Estimation of Aeroheating upon the Warhead Nose at Supersonic Speed

An expression for estimating the aeroheating on a warhead nose at different supersonic speeds is proposed by incorporating CFD （computational fluid dynamics） and the least-square method. Compared with the traditional estimation formula, the expression is more accurate, convenient and can be used in the optimized design of warheads. The error from the result obtained in the test of a ball cartridge flight is less than 3 %. It satisfies the engineering requirements.