鱼雷高空投送载体结构设计特性研究

由于现代战争的空中化进程加剧,制空权的争夺日趋激烈,因此高空投送鱼雷（HADT）的出现符合现代化武器的发展趋势。分析了高空投送载体在制导滑翔炸弹（GGB）及高空反潜武器概念上的应用和研制现状,在此基础上,比较了HADT与GGB之间的异同点,并从刚强度、环境适应性、导航控制、＂可展开＂、＂可分离＂等5个方面探讨了鱼雷高空投送载体的结构设计特性,提出了相应的设计策略,为HADT的设计研发提供思路。     

信息动态

为争夺国际鱼雷武器市场,意大利白头公司于今年2月推出一型世界首例性能优异的光纤制导潜射重型鱼雷。该雷为电动力(反转电机)推进,采用功能强大的Astra新一代声学自导头,在被动探测方面性能尤佳,采用光纤制导(对鱼雷无电磁干扰、利于中远距离制导、传输信息量大、可实现发射舰与鱼雷的双向传输和制导精度与距离无关等优点),具有很高带宽和极远控制能力。据称,该型鱼雷问世将会受到同行业的关注。     

MILITARY NEWS

<正>印度海军将接收首批"瓦拉纳西特拉"反潜鱼雷2020年1月,印度军方接收首批本国制造的"瓦拉纳西特拉"反潜鱼雷。"瓦拉纳西特拉"由印度国防研发组织所辖的海军科学技术实验室开发,本国设计制造率超过95%。它重约1.25吨,携载250千克常规战斗部;采用电力驱动,装有250千瓦的氧化银锌电池,最大航速超过40节;采用了共形阵列换能器、先进自主制导算法、低漂移导航装置、不敏感战斗部装药等先进技术,并加装了GPS定位辅助装置。     

基于联合制导方式的潜射反主动声纳鱼雷探讨

针对现行潜射反舰鱼雷制导方式受海洋环境的影响,潜艇攻击距离和鱼雷自导距离被制约的问题,借鉴反辐射导弹的设计理念,提出了一种基于对目标探测信号的测量和其他组合联合制导的新型鱼雷制导方式。采用这种自导方式的反主动声纳鱼雷,以反潜舰艇和鱼雷发出的主动声纳脉冲信号为导引源,对目标实施硬杀伤。探讨了联合制导方式下,反主动声纳鱼雷的设计原理及技术特点,并假想了其作战流程。分析表明,反主动声纳鱼雷的作战特点符合实际攻击和作战需要,具有较好的应用前景。     

制导规律与目标位置的预测

在分析经典制导规律的改进过程中，总结出制导规律的性能与对目标位置预测的关系，从而得出改进制导规律的一种思路。     

基于以太网的鱼雷声光复合制导全弹道仿真平台构建

光纤线导＋声尾流制导的复合制导方式能够较好地克服单一制导方式的缺点,提高鱼雷武器在复杂水声物理场环境中对目标的探测距离和导引精度。本文研究了鱼雷射前流程,作战态势,线导方法以及舰船尾流模型和尾流自导检测模型等内容,完成了基于以太网的鱼雷线导＋尾流制导全弹道仿真平台构建,为下一步半实物鱼雷全弹道仿真平台构建提供技术支撑,可以支持完成复合制导鱼雷的使用方法和性能评价等一系列研究工作。     

鱼雷制导技术展望

鱼雷是主要的反潜武器之一,鱼雷制导技术的使用使其战技性能有了质的提升,当前鱼雷制导方式的发展呈现多样化的特点。重点介绍了当今世界主要的几种鱼雷制导方式的技术特点及其战斗使用情况,并在总结和归纳的基础上,对未来鱼雷制导技术的发展趋势作了展望。     

基于OpenMP的鱼雷制导仿真系统设计

为了提高鱼雷制导仿真系统的并行程度和执行效率,首次将并行编程标准OpenMP和多核处理器引入鱼雷制导仿真系统。首先采用面向对象思想设计了鱼雷制导仿真系统的整体结构框架,分析了仿真系统各任务的特点及其之间的并行关系,在此基础上利用OpenMP对仿真系统进行并行化处理,并将并行仿真系统运行在具有八核处理器的SGI工作站上。仿真结果表明,单步平均解算耗时可以减少到7~8 ms。与其他鱼雷仿真系统相比,该方法较大地降低了仿真解算时间,有效地提高了仿真系统的执行效率。     

深海防身术——潜艇如何防御鱼雷攻击

潜艇由于其特殊的结构和作战环境，被鱼雷击中后自保的机会十分渺茫。现代制导鱼雷具有很高的命中概率，据统计，正常情况下，其命中概率可达80％以上。但是当目标潜艇使用鱼雷防御手段后。其命中概率就会降低到20％-40％。由此可见，潜艇装备和使用鱼雷防御系统十分必要。目前潜艇鱼雷防御手段从性质上可分为软杀伤鱼雷防御、硬杀伤鱼雷防御、非杀伤鱼雷防御三种。     

国外光纤制导鱼雷技术综合分析

本文在介绍了光纤制导鱼雷的优越性以及国外研制现状的基础上，着重探讨了实施光纤制导鱼雷的几种方法及存在的技术要点和解决途径，并对我国实施光纤制导鱼雷的可行性进行了分析。     

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.