精确的简化的过渡动柔度式及应用

介绍了一个变奇异阵为非奇异阵的数学结论。然后利用这个“结论”发展了一种精确地这渡动柔度式和一种近似简化的过渡动柔度式。     

基于实用完备模态的动柔度式——特征向量导数

首次提出了用计算很多特征向量导数的一种精确动柔度法和一种简化动柔度法，精确动柔动式依赖作者提出的实用完备模态空间建立的，与所有现在的“直接法”（即动刚度法）不同，本方法相当于只需要求解特征向量导致支配方程一次便可计算很多特征向量的导数，因此，待求导的特征向量个数越多，本文方法的计算效率越高，精确动柔度法可给出“导数”的精确值，简化动柔度法可引出良好的近似值。     

移频动柔度简化式和特征向量导数

利用移频技术改进了动柔度简化式在特定频段内精度极低的问题，然后将改进的动柔度简化式用于此频段内的一组特征向量导数的计算取得了很好的效果。当然，比频段内的特征向量越多和相对越密集，不仅计算效率越高，而且其精度也越好，不过，太密集了又会出现密集根的特征向量导数计算问题，对此不作讨论。     

改善动柔度法之精度和效率的移频技术

作者曾提出过用于计算很多特征向量导数的动柔度法，这种方法对一般结构，即非密集根情况，不仅精度良好，而且计算上也是很有效的，然而遇到密集根时，因动柔度法的λ幂级数发散，导致精度急剧变坏，为此，提出了本阶移频动柔度法和混合移频动柔度法，这两种方法各自用于具有密集根的约束结构和自由结构的特征向量导数，或者是一般约束结构和一般自由结构的高阶特征向量导数计算将是最为理想的动柔度法。     

动柔度法对频响函数灵敏度的应用

频响函数灵敏度是结构振动控制,破损诊断和动力优化中很有用的信息,然而,对频响函数灵敏度的研究还不多。基于动柔度混合幂级数,对于无阻尼频响函数灵敏度分析提供了一种可行的动柔度法,它是特征向量导数计算中的动柔度法移植后的结果。数值考核表明,这种方法的精度良好。     

特征向量导数的高精度动柔度法和模法

基于动柔度的高精度表达式建立了很多特征向量导数计算的动柔度法和模态法,动柔度的高精度式推导首先是基于经的谱表达式,然后将其分为将阶模态贡献项和高阶模态贡献项,其中高阶贡献项在实际中是不可能得到的,为此,又将高阶贡献项分为静态贡献和动态贡献,其中静态贡献可以精确得到,唯有高阶模态的动态贡献不得不展开为一种可运作的几何级数,当特征根的间距稍大时,该几何级数的前几项就可收敛到动态贡献的精确值,一旦遇到较密集的特征根时,该几何级数的收敛速度会明显下降,理论上可以通过移频使得该内何级数达到加速收敛。     

避免约束奇异的平动并联机器人设计方法

构造一种基于螺旋理论的空间机构综合方法,分析了并联机器人发生平台约束奇异的原因。利用三条支链对平台所提供的特殊正交约束,得到了一种彻底避免运动平台奇异的纯平动三自由度并联机器人。给出满足这一条件的所有结构组合,运动副组成类型和空间装配原则。最后,依据这一理论设计出2个新型三自由度并联机器人作为范例。     

复合材料弹性枪架材料设计研究

本文应用矩阵结构分析方法，结合复合材料力学性能特点，研究了先进纤维增强复合材料弹性机枪枪架的柔度矩阵，为机枪系统合理的动力学匹配提供了必要的力学参数，研究确定了结构柔度矩阵中影响精度最敏感的柔度系数与前，后架杆抗弯刚度的关系，提出了一种基于枪架结构分析基础上，以枪架重量为控制目标函数，优化复合材料枪架的材料铺层设计方法。     

用NASTRAN程序计算翼面的发散速压

介绍了翼面发散问题计算，不用传统的动气动弹性力学分析方法(模态法)，而用静气动弹性力学的分析方法(柔度法)计算配平条件下的多组(q，θ)值，通过作曲线求得发散速压，通过比较，可以利用等轴双曲线表征发散曲线，从而得出求解发散速压的简便公式。     

有限偶极子天线阵的电磁散射理论研究

研究了一种求解阵元为偶极天线的有限阵列的电磁散射的方法：利用RWG基函数和偶极模型的特殊性,将近似无穷小的偶极天线产生的电流代替由RWG基函数相邻边缘元素产生的电流,此方法有效地计算了散射场。讨论了RWG基函数的基本概念及其在计算阵列散射场中的应用,以极坐标的形式给出了不同的阵元间距、入射频率、入射角度以及不同阵元数目的散射场仿真图形,为其他形式的阵列天线散射特性研究提供了依据。     

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.     

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.