火箭助飞鱼雷实航工作可靠度试验与鉴定方法研究

探讨了火箭助飞鱼雷实航工作可靠度试验与鉴定程序,研究了实航工作可靠度试验信息的收集、使用和转换;提出了火箭助飞鱼雷实航工作可靠度验前信息的来源、原则、相容性检验和可信度的综合使用方法;针对火箭助飞鱼雷实航工作可靠度指标既有系统又有分系统级的指标,一是引入验前信息可信度融合算法和优化序贯检验方法对分系统指标进行检验与评估;二是采用系统可靠性贝叶斯近似下限法对全雷实航工作可靠度指标进行综合评定。     

一种改进的鱼雷实航工作可靠度评定方法

为了客观准确地评定鱼雷可靠性水平,针对单纯采用成败型或指数型评定鱼雷实航工作可靠度的局限性,根据鱼雷实航功能和动作程序包含成败型和指数型的实际特点,提出了按成败型-指数型串联综合评定鱼雷实航工作可靠度的改进方法。该评定结果是试验样本量、航行总时间、任务时间、成败型和指数型故障数等因素的综合体现,可靠性水平随任务时间变化的显著性受指数型故障的影响相对较大,受成败型故障影响相对较小,评定结果更客观准确,能有效解决单纯按成败型或指数型评定鱼雷可靠性的局限性。     

火箭助飞鱼雷飞行可靠性评定方法

从火箭助飞鱼雷飞行可靠性试验与鉴定的需要出发,分析火箭助飞鱼雷飞行可靠性的特点,对验前信息的获取手段进行总结,给出地面试验数据综合为飞行试验数据的方法,并提出分系统数据综合为系统数据转换方法,分别使用经典法和贝叶斯法对火箭助飞鱼雷的飞行可靠性指标进行评定,分析比较二者的优劣,确定了火箭助飞鱼雷飞行可靠性评定的方法。     

基于变权模型的鱼雷综合性能评估方法

通过分析鱼雷分系统之间以及分系统和指标之间的关系,建立了具有递阶层次结构的鱼雷综合性能指标体系;利用模糊数学有关理论,提出了一种基于变权模型的鱼雷综合性能评估方法。首先对实航数据进行无量纲化处理,然后利用变权模型对由层次分析法获得的基本权重进行权重调整,并利用模糊综合方法实现鱼雷综合性能的量化评估。仿真数据验证了该方法用于鱼雷综合性能评估的可行性,为实航验收试验提供了决策依据。     

基于AMSAA增长模型的鱼雷系统Bayes可靠性分析

Bayes理论是分析研究鱼雷系统可靠性的有效方法,文中针对美国陆军装备系统分析中心( AMSAA)增长模型,提出了Bayes可靠性增长分析的基本方法。该方法将鱼雷研制阶段的可靠性增长试验数据作为产品可靠性评估的先验信息,再结合少量现场试验数据,运用Bayes方法即可对现场试验后的鱼雷产品可靠性进行评定。仿真结果验证了该方法的有效性,为鱼雷系统可靠性评定提供了一种新的分析方法。     

鱼雷研制阶段可靠性评估方法

鱼雷在研制阶段通常进行大量的系统试验,这些试验包含了许多有效的可靠性增长信息,如何充分利用这些信息来评估鱼雷在研制阶段的实航工作可靠度成为人们关注的问题。该文针对鱼雷在研制阶段收集到的各类可靠性信息特点,提出了一种综合的可靠性增长分析方法,该方法在分析不同产品在不同试验阶段的可靠性信息特点的基础上,利用不同的可靠性增长模型评估产品可靠度,再利用信息融合的方法综合评估鱼雷的工作可靠度,为评估鱼雷在研制阶段的可靠性水平提供了一种较好的途径。     

基于威布尔分布的鱼雷实航工作可靠度评估方法

为了解决传统基于二项分布评估鱼雷实航工作可靠度方法无法区分远近航程航行之间可靠度差别的不足,针对现代鱼雷系统功能结构和故障状态复杂、航行距离远和工作时间长等特点,提出基于威布尔分布的鱼雷实航工作可靠度评估方法。计算实例表明,该方法简单实用,可对鱼雷实航工作可靠度进行更直观和科学的评估,可为现代鱼雷可靠性试验鉴定提供参考。     

地地战术导弹飞行可靠性指标评定方法

在小子样情况下 ,利用系统和分系统试验数据对导弹的飞行可靠性指标进行评定 ,从数学上说是系统可靠性综合问题 .运用MML SR方法对新型号地地战术导弹的飞行可靠性指标进行评定 ,避免了MML方法在遇到无失败单元时不适用的缺陷 ,在利用地面试验信息方面有其明显优势 ;运用Bayes方法对改进型导弹的飞行可靠性指标进行评定 ,将不同试验阶段的多源试验信息作为验前信息 ,扩大了信息量 .最后 ,对两种方法在工程应用上遇到的问题进行了讨论 ,并给出了解决方法 .     

连建制高炮系统可靠性试验时间累计方法

摘要：为解决高炮系统在不同工作方式下可靠性试验时间统计的问题,提出一种连建制高炮系统可靠性试验时 间累计方法。将系统工作时间转换为统计各分系统独立工作时间,通过对不同工作方式下各分系统工作时间进行加 权统计,将联合工作时间变换为分系统独立工作时间,给出成建制高炮系统可靠性试验时间累计方法,并以实例进 行分析。试验结果表明,该方法可以用于成建制武器的可靠性评定。     

基于验前信息可信度的鱼雷实航工作可靠度Bayes融合评估方法

针对火箭助飞鱼雷作战效能中实航工作可靠度这一指标的考核,存在着试验样本数少、风险高等缺陷,不利于对该指标作出正确的评估。为此,借鉴战术导弹鉴定试验技术,使用验前信息进行指标融合评估,但为防止大量的验前信息＂淹没＂现场试验信息的可能性,提出了基于验前信息可信度的后验加权Bayes融合评估的鱼雷实航工作可靠度指标考核方法,该方法能够较真实地评估出鱼雷实航工作可靠度指标。     

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.     

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.     

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.     

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。     

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.     

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.