运载火箭加注系统可靠性评定方法研究

运载火箭加注系统是航天发射场关键系统之一,由于加注系统具有设备多,信息采集点多、面广,技术、控制逻辑复杂等特点,从各大发射场执行加注任务的情况看,设备故障概率较高,系统可靠性需进一步提高。对加注系统可靠性评定方法进行研究,重点评估加注系统设备可靠性和任务可靠性,分析加注设备级、系统级薄弱环节,提出加注系统的可靠性分析和评定方法的解决方案。     

基于信息融合的复杂系统可靠性综合评估

为准确评价国防武器装备的可靠性水平,提出一种基于信息融合的复杂系统可靠性评估方法。根据信息 融合理论,阐述了专家经验信息、部件子系统信息以及可靠性增长信息的融合方法,综合考虑信息源的继承性及异 总体性,引入继承因子的概念,探讨了基于信息融合的复杂系统可靠性评估方法,结合系统试验信息推断出产品的 可靠性,并以实例进行分析。分析结果表明：信息融合方法评估结果合理,在可靠性工程领域具有较高的应用价值。     

基于GO 法和Bayes 的制导弹药控制系统可靠性评估

为解决制导弹药实验可靠性评估困难的问题,提出一种融合GO法和Bayes估计的制导弹药可靠性评估方法.利用Bayes法对多源先验信息进行处理,采用威布尔分布作为分布拟合,结合GO法,生成GO图并进行运算,构建系统可靠性模型,给出系统可靠性评估,并以制导弹药控制系统为实例进行验证.结果表明:该方法既充分利用了先验信息,又体现了GO法对复杂系统分析的优势.     

双35mm牵引高炮系统任务可靠性评估与分析

针对双35mm牵引高炮系统可靠性指标体系验算系统固有可靠性水平，评估系统可靠性参数对系统效能的影响，分析以系统可靠性为中心的相随维修性，保障性设计思想在复杂系统中的应用。     

反舰导弹武器系统可靠性数据库管理与评估系统

用传统的方法进行导弹武器系统可靠性数据管理和可靠性评估已很难满足需要。该文采用关系型数据库技术以及可靠性评估的系统综合法,设计可靠性数据库管理系统并完成反舰导弹武器系统可靠性评估。     

复杂大系统动态可靠性与动态概率风险评估技术发展现状

复杂大系统发生故障往往会造成巨大的经济损失，乃至恶劣的社会影响和重大人员伤亡，其可靠性与概率风险评估一直受到广泛关注。如何在复杂大系统可靠性与概率风险评估中综合考虑系统的动态行为对系统可靠性与风险性的影响成为近二十多年来研究的热点，并提出和发展了复杂大系统动态可靠性与动态概率风险评估的概念与方法，本文对其概念的定义，理论与技术内涵做了较全面的综述，介绍了目前几种典型的动态可靠性评估方法，以及该技术的应用情况，能为动态可靠性的研究提供借鉴和帮助。     

应用贝叶斯方法进行系统可靠性验证

可靠性验证是系统开发过程中的重要环节.在实际工程应用中,由于复杂系统在开发过程中样本数量极少,使得按传统方法进行系统的可靠性验证十分困难.本文基于贝叶斯方法和系统研制过程中可靠性信息的利用,提出了复杂系统可靠性综合验证方法.该方法将部件的设计分析作为部件可靠性的验前信息,并用部件寿命试验结果将其更新;根据系统结构,将各部件更新后的可靠性信息综合,得出系统验前可靠性信息;以该信息为基础,制定和实施系统可靠性验证试验计划.该法的应用表明,对于复杂系统在研制阶段进行可靠性验证,所需样本数明显少于基于经典可靠性理论所需的样本数.     

浅谈武备系统可靠性工程

鉴于武备系统可靠性研究是一项复杂的系统工程,越来越受到各方面的重视.对武备系统的可靠性工程技术进行了较详细的讨论,包括系统可靠性预计、可靠性分配及可靠性故障分析,并对典型的可靠性模型进行了分析与计算,对武备系统的可靠性研究与发展具有一定的指导意义.     

武器系统可靠性评估中的信息折合计算

基于贝叶斯理论，论述了将组成复杂系统各单元的可靠性信息折合成成败型单元信息，并进行信息综合计算，得出复杂系统可靠性评估结论的方法，并给出了算例。     

载人火箭的遥测系统

火箭遥测系统的作用是对火箭飞行过程中所有的动态参数进行测量,并以无线发射形式将数据实时发送回地面。载人运载火箭的遥测系统不仅承担了火箭飞行过程中所有动态参数的测量,而且是载人火箭在故障判决工作中的重要组成部分,承担着火箭Ⅰ、Ⅱ类参数的测量和传输,为提高系统可靠性采取了大量行之有效的办法,在系统的关键部分和薄弱环节采取多种形式的冗余、并联等可靠性设计,系统及参数测量的可靠性达到同行业中较高水平。文章对遥测系统的研制任务、系统组成、关键技术和高可靠性等方面进行全面介绍。     

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.     

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.     

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.     

Passive Acoustic Radar for Detecting Supersonic Cruise Missile

A Passive Acoustic Radar is presented as a necessary complement to electromagnetic wave radar, which will be expected to be an effective means for detecting cruise missiles. Acoustic characteristics of supersonic flying projectiles with diverse shapes are expounded via experiment. It is pointed out that simulation experiment could be implemented using bullet or shell instead of cruise missile. Based on theoretical analysis and experiment, the ““acoustic fingerprint““ character of cruise missile is illustrated to identify it in a strong noise environment. After establishing a locating mathematical model, the technique of acoustic embattling is utilized to resolve a problem of confirming the time of early-warning, considering the fact that velocity of sound is much slower than that of light. Thereby, a whole system of passive acoustic radar for detecting supersonic cruise missile is formed.     

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.     

Super-resolution Restoration of Remote-sensing Images

A novel image restoration scheme, which is super-resolution image restoration algorithm Poisson-maximum-afterword-probability based on Markvo constraint （MPMAP） combined with evaluating image detail parameter D, has been proposed. The advantage of super-resolution algorithm MPMAP incorporated with parameter D lies in the fact that superresolution algorithm MPMAP model is discrete, which is in accordance with remote-sensing imaging model, and the algorithm MPMAP is proved applicable to linear and non-linear imaging models with a unique solution when noise is not severe. According to simulation experiments for practical images, super-resolution algorithm MPMAP can retain image details better than most of traditional restoration methods; at the same time, the proposed parameter D can help to identify real point spread function （PSF） value of degradation process. Processing result of practical remote-sensing images by MPMAP combined with parameter D are given, it illustrates that MPMAP restoration scheme combined PSF estimation has a better restoration result than that of Photoshop processing, based on the same original images. It is proved that the proposed scheme is helpful to offset the lack of resolution of the original remote-sensing images and has its extensive application foreground.