筛选分组方法在电火工品性能测试中的应用

为正确判断电火工品受环境因素影响后的性能变化情况,通过瞬态脉冲试验、发火试验以及升降法试验得到的试验结果,研究了对桥丝式电火工品进行随机分组和用瞬态脉冲试验进行筛选分组两种试验方法的区别,比较了两种试验方法中不同组电火工品50%发火电流、平均发火时间和平均温升值差异.结果表明按照瞬态脉冲试验对样品进行筛选分组的方法可以...     

电火工品发火感度无损检测的展望

介绍了电火工品瞬态脉冲试验的基本原理,回顾了电火工品发火感度无损检测技术的发展历史,认为该技术目前仍处于统计性处理的阶段,今后应拓展该技术应用领域,加强电火工品发火性能的单发预防并研制相应的仪器。     

射频对桥丝式电火工品性能的影响

本文研究了射频试验对桥丝式电火工品性能的影响。试验表明，经射频能量作用后，桥丝式电火工品发火功率降低、作用时间变长，甚至可能造成射频瞎火。文章还对施加射频能量的大小、时间及对电火工品性能的影响进行了测试。     

引信发火系统无损检测研究

简单介绍了瞬态脉冲试验（ＴＰＴ）的原理，分析了美国ＴＰＴ技术在引信发火电路锈蚀检测中的应用，以及我国ＴＰＴ技术用于电火工品储存性能无损测试验结果，论证了利用ＴＰＴ技术进行引信发火系统无损检测的可行性。     

引信发火系统无损检测研究

简单介绍了瞬态脉冲试验（ＴＰＴ）的原理，分析了美国ＴＰＴ技术在引信发火电路锈蚀检测中的应用．以及我国ＴＰＴ技术用于电火工品储存性能无损检测试验结果，论证了利用ＴＰＴ技术进行引信发火系统无损检测的可行性。     

桥丝式电火工品射频致瞎评估

依据 MIL-STD-1576中射频感度试验方法和射频致瞎评估方法,对两种典型桥丝式火工品进行了射频感度试验和射频暴露前后直流感度试验,对比分析两种样品在10%射频发火能量作用前后的直流发火特性,并对二者进行射频致瞎评估.本研究对射频致瞎评估方法进行初步探索与实践,积累了一定的试验数据,为进一步开展电火工品射频致瞎试验和评估方法研究奠定基础.     

桥丝式电火工品安全电流的数学模型

从桥丝式电火工品的传热模型入手,结合瞬态脉冲试验的原理,对桥丝式电火工品的安全电流进行了研究,得出了计算安全电流的数学模型和安全电流的数学表达式,证明利用无损检测和数学模型对单发电火工品进行性能预测是可行的,为进一步研究电火工品的单发性能预报提供了参考.     

电火工品发火过程的无损耗检测方法

提出一种电火工品无损耗检测的方法,以便在电火工品的可靠性试验中对产品的性能给出准确的判据.采用感应线圈作为非接触式发火电流的检测装置,实现了对电火工品发火电流的无损耗取样,同时采用大规模集成电路,实现了电火工品发火过程中微秒级瞬态信号的采集、存储与处理,为可靠性试验提供了一种在线的无损耗实时检测系统,可以对电火工品的发火全过程进行检测.     

电火工品的感度控制和预报

介绍了电火工品用瞬态脉冲试验控制感度的基本方法，讨论了电火工品发光感度无损检验的发展前任认为发展单发性能损报和相应的仪器有很大的可能性。     

灼热桥丝式电火工品脉冲电流激励发火规律分析

为研究灼热桥丝式电火工品的脉冲激励安全性,建立了灼热桥丝式电火工品的温升数理模型,研究了灼热桥丝式电火工品的发火判据,设计了灼热桥丝式电火工品临界发火电流的计算流程,揭示了单脉冲和脉冲串电流的激励参数对灼热桥丝式电火工品临界发火电流的影响规律。结果表明,在单脉冲激励下,当脉冲宽度小于5 μs时,灼热桥丝式电火工品的临界发火能量固定,即桥药系统处于绝热状态,灼热桥丝式电火工品是否发火与桥丝输入的能量有关;而当脉冲宽度大于15 ms时,灼热桥丝式电火工品临界发火电流固定,其发火状态与桥丝的电功率有关。在窄脉冲串电流激励下,临界发火电流随重复周期变化曲线的时间常数与脉宽无关,且当重复周期大于1.25 ms时,桥药系统无热累积效应,其临界发火电流与单脉冲电流作用情况一致;而当重复周期小于1.25 ms时,桥药系统出现热累积效应,该效应导致临界发火电流随重复周期降低而迅速衰减。     

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.     

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.     

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.