中、长疲劳寿命的累积损伤

该文根据坦克传动箱体的载荷特性,推导出了适用于中、长寿命估算的疲劳累积损伤公式,并用此公式及传动箱体的实测应力谱估算了传动箱体的寿命和可靠性,结果比以往常用的累积损伤公式准确。     

国产主战坦克平衡肘疲劳强度及可靠性分析

坦克在服役中平衡肘断裂较多,本文从实际应用出发,在大量试验数据的基础上,对平衡肘的疲劳强度及可靠性作了较系统的阐述。主要内容有:载荷谱的测试与处理,环境温度对强度的影响,疲劳扩展特性,在载荷谱作用下的寿命估算及可靠性分析。为平衡肘设计、模拟试验提供了一些基本依据。由于条件所限,有些试验还需进一步补充和完善。     

基于冷挤压强化技术的传动箱可靠性增长研究

针对特种车辆传动箱螺纹孔处疲劳损坏的情况,基于金属物理及弹塑性原理的冷挤压强化技术和螺纹齿各部位挤压量的不同匹配对疲劳强度的影响,找出了较佳的挤压强化方案.按疲劳损伤等效法则将实测的载荷谱转化为程序载荷谱并进行了台架模拟试验及道路行驶试验,试验结果表明采用非均匀挤压量技术对螺纹齿根、齿侧和齿尖同时挤压,可大幅度提高疲劳寿命.     

自行火炮综合传动装置非线性动力学仿真与疲劳可靠性寿命预测

为准确地获取综合传动装置关重件的载荷谱,对自行火炮的综合传动装置非线性动力学仿真与疲劳可靠性寿命进行预测研究.建立非线性多级齿轮传动系统的虚拟样机,对其工作过程进行仿真,将同工况条件下综合传动装置虚拟样机仿真结果与综合传动实验台实验结果进行对比,验证基于虚拟样机获取载荷谱的可信性,对载荷谱进行插值运算得到齿轮危险点的应力-时间历程,采用三峰谷雨流计数法生成2维分布的随机疲劳应力谱,充分考虑材料的疲劳性能,预测关重件在多存活率下的疲劳可靠性寿命.研究结果表明:该方法能准确地描述齿轮-转轴-轴承非线性系统的动力学特性,预测关重件在多存活率下的疲劳寿命,为实现预防性维修和精确化保障提供决策依据.     

机载飞航导弹结构使用寿命确定

针对机载飞航导弹的挂机使用寿命要求，建立了导弹结构疲劳寿命评定技术方案，介绍了疲劳载荷谱编制、疲劳寿命估算、耐久性分析及相关试验技术．     

车辆扭杆弹簧疲劳载荷谱的编制

该文讨论了编制车辆悬挂扭杆弹簧结构疲劳载荷谱的原则、方法和程序。该文结合某中型车辆使用情况,确定了车辆任务剖面、结构载荷环境、结构载荷情况以及载荷简化原则和方法。最近,阐述了结构疲劳试验谱的编制过程。为扭杆弹簧结构寿命估算提供了编谱方法。     

坦克非电零部件的可靠性加速寿命试验方法

该文介绍了非电零部件可靠性加速寿命试验技术概况以及存在的问题，提出了几种可靠性加速寿命试验方法，重点阐述了强化载荷法，指出了用于可靠性加速寿命试验的使用载荷谱和试验载荷谱的测试、数据处理及编制方法，最后给出了可靠性加速寿命试验的试验方案设计技术。     

车架多工况功率谱法随机疲劳寿命估算

该文根据功率谱法随机疲劳寿命估算的基本原理,推导出载重汽车车架多工况寿命估算的功率谱综合法。依据损伤等效的原则,建立了多工况综合功率谱数学模型,并利用该方法对IFA—W50L卡车的纵梁进行了疲劳寿命估算,运用Monte Carlo模拟和传统的寿命估算方法验证了谱综合的有效性。估算结果与实车试验结果有较好的一致性。     

枪机闭锁凸笋的冲击疲劳强度设计与寿命估算方法探讨

通过对枪机工作载荷和断裂部位应变速率的分析计算，说明其载荷性质为重复脉动式冲击载荷。应用疲劳理论和平面应力枪机试件的测试结果，说明其失效规律为冲击疲劳。通过对国内外冲击疲劳强度理论研究现状的分析，说明目前进行枪机闭锁凸笋冲击疲劳强度设计和寿命估算最简捷的方法是模拟实验－经验公式法。作为这一方法的补充，文中还介绍了修理的Ｌａｎｇｅｒ方法。     

基于刚度衰减下的桁架系統的疲劳可靠性分析

在疲劳载荷作用下，元件物理性能的衰减过程是十分复杂的，而由元件组成的结构系统不是一个简单的拓扑结构，其物理性能在疲劳载荷作用下的变化更为复杂。为了定量分析结构系统在不同寿命期内的刚度可靠性，建立起结构物理性能衰减的精确公式是至关重要的。本文从损伤力学角度出发，结合断裂力学中理论断裂强度公式，利用应变等效性假设，基于剩余强度衰减模型，推导出弹性模量衰减公式，从而给出了疲劳载荷作用下系统刚度的可靠性衰减公式。最后，结合杆元桁架系统刚度矩阵，推导出桁架系统节点位移在不同使用寿命期的计算公式，进而求出系统刚度的疲劳可靠性指标。     

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.     

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.     

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.     

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。     

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.