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。     

鱼雷实航打靶试验中战雷起爆点定位方法

为准确测定鱼雷打靶试验中战雷起爆的实时位置,确保试验实施效果,该文对鱼雷实航打靶试验中战雷起爆点的几种定位原理进行了简要阐述,结合鱼雷打靶试验的实际测量情况,对各定位方法的应用效果和适用条件进行了综合比较和分析,提出了鱼雷实航打靶试验定位测量的冲击波零时定位法和冲击波走时定位法,试验证明,该方法具有通用性和推广价值。     

鱼雷实航工作可靠度评定方法

在鱼雷可靠性鉴定试验中,部分实航鱼雷的系统配置是变化的,直接用全雷实航试验信息进行可靠性评定的方法已不适用。针对此问题,该文利用系统可靠性评定方法,首先分别统计各分系统的实航试验信息,剔除不属于鱼雷分系统的可靠性试验信息,然后将分系统可靠性试验信息折合为全雷可靠性信息,再与正常配置的全雷实航信息综合,根据综合结果可较准确地评定鱼雷实航工作可靠度。     

初始运动数学仿真在鱼雷研制中的应用

本文以某型空投鱼雷为背景,给出了影响鱼雷初始运动各个环节的动态数学模型,重点说明利用这些模型及相应的数学仿真软件包开展的数学仿真试验在鱼雷研制过程中的应用情况。实航试验表明,所用软件能够解释并复现实航中出现的故障和现象,解决了非定常条件下控制系统的参数设计问题。通过仿真结果与实航结果的对比,验证了该模型和软件的正确性。     

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。     

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。     

多功能声自导反潜鱼雷战雷靶

针对缺乏用于声自导反潜鱼雷战雷实航爆炸试验攻击目标的问题,提出一种具有水声引信的多功能战雷靶设计思路.介绍多功能声自导反潜鱼雷战雷靶的设计方案,利用经典物理学的能量、动量原理,详细计算分析鱼雷在各种边界条件下攻击钢架的情况,并简要分析海流对鱼雷命中的影响.仿真结果表明:当Δt≤0.4 s时,鱼雷瞬间冲击加速度a(g)≥5g,满足引信动作需求,鱼雷可以引爆.该战雷靶的设计思路可为未来鱼雷声自导反潜战雷实航爆炸试验提供技术参考.     

UUV自航发射鱼雷过程仿真

无人水下航行器(UUV)外挂鱼雷具有重要的战术价值.由于UUV体积小、质量轻,自航发射鱼雷时运动状态会发生改变.为了定量分析这种变化以验证发射的可靠性,建立了UUV自航发射鱼雷的运动模型,根据此模型利用FLUENT对发射过程进行了仿真.仿真结果表明,UUV发射鱼雷时运动状态会发生一定的变化,但采用自航发射仍然具有可行性.同时得出鱼雷脱离发射导轨时的运动参数,为精确计算鱼雷的外弹道提供了依据.     

鱼雷综合性能评估的效用函数方法

鱼雷综合性能评估是鱼雷机判验收试验的关键步骤之一。为了对鱼雷性能做出系统评估,需要对鱼雷各项受检项目进行综合考查,得到一个能代表鱼雷整体性能的综合指标。本文为鱼雷实航试验综合性能评估提出了一种新的效用函数评估方法。该方法首先将各项目实测值相对无量纲化,然后通过权重的调整进行绝对无量纲化,并通过加权合成得出了该效用函数方法的定量评估结果。最后,以实例验证了该方法的可行性。     

轻型鱼雷上浮装置整流罩安全解脱技术研究

现代轻型鱼雷设计中为了保证操雷安全上浮,采用了多种上浮装置,其中较常用的是浮囊充气式上浮装置.为了保持雷体线型,在雷体表面用整流罩包覆住浮囊,鱼雷航行终了后浮囊充气,整流罩解脱,鱼雷可以顺利浮起,便于打捞回收.本文提出了整流罩安全解脱设计方法,分析了整流罩与浮囊匹配、拉断销力值及抗干扰等方面的问题.并给出了一种新型的安全解脱机构.     

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.