稀土和银对 Mg-Li 合金显微组织及力学性能的影响

通过正交实验确定了具有较高强度和塑性的Ｍｇ－７Ｌｉ－１４Ｚｎ合金中Ａｇ、Ｎｄ、Ｌａ和Ｃｅ的最优添加量，比较了其不同强化效果，并指出正交最优合金力学性能。通过ＴＥＭ组织观察，确定了各合金元素的析出相分别为Ｍｇ３Ａｇ、Ｍｇ１７Ｌａ２、Ｍｇ１７Ｃｅ２和Ｍｇ３Ｃｅ，而Ｎｄ则固溶于α相中形成固溶强化。     

激光全息无损检测在燃气发生器质量控制中的应用

本文介绍一种激光全息无损检系统的基本组成和工作原理，以及该系统在某型燃气发生器质量控制中的应用情况。该系统能正确地判断装药包覆层脱粘的位置和大小，具有检测结果直观，可靠等优点，可作为燃气发生器装药生产过程中必要的质量控制手段。     

日本七吨推力氢氧发动机涡轮泵用燃气发生器的试验

一、绪言 1979年东京大学宇宙航空研究所试制了供七吨推力氢氧发动机系统用的准飞行型燃气发生器,并进行了试验。这里作一扼要介绍。为了缩小体积和减轻重量,飞行用的燃气发生器一般多直接安装在涡轮喷嘴的集气环上。燃气发生器的基本问题是,在不烧毁燃气发生器反应室和涡轮叶片的情况下如何组织燃气混合问题。当然,这取决于反应室和喷注器的结构形式,但燃气发生器的有些问题并不完全符合     

一种流量可调燃气发生器压强控制系统建模及其半实物仿真

为了改进燃气发生器流量控制的精度,研究了一种燃气发生器的压强控制系统。建立了燃气发生器与气动执行机构的线性化数学模型,分析了燃气发生器压强控制系统的特点,并通过半实物仿真系统对压强控制系统进行了仿真验证,获得了燃气发生器内压强变化曲线。实验表明,压强控制系统是一个变化缓慢系统,并且其参数具有时变性。     

固冲发动机的流量调节技术——流量调节系统设计

阐述了固冲发动机燃气流量调节的必要性,对发生器燃气流量调节方案进行了评述．采用以改变喉面积来调节燃气流量的方案,对方案的静、动特性进行了分析．     

固冲发动机的流量调节技术（3）调控系统软件设计

介绍了固冲发动机进气道流入的空气流量是随固冲导弹的飞行高度、速度和攻角而随机变化的,发生器的贫氧燃气流量与空气流量之比在化学恰当比附近保持为常数（等）是一种合理的调节．通过比较法,将发生器实时生成的燃气流量与等时实际所需的燃气流量相比较,有差别时,通过发生器喉面积调节,达到二者一致．说明了这种调节是在软件和硬件的共同作用下完成的．叙述了与控制系统硬件相辅相成的软件设计,包括上述比较法和论文（1）的静、动特性分析等基本软件,以及若干功能子程序和抗干扰专用软件设计．     

弹道应用双压力级固体末助推燃气发生器

本文叙述了弹道应用双压力级固体末助推燃气发生器的设计准则和性能要求。这种高性能固体燃气发生器的特征,是具有压力调节的浇铸在壳体内的端面燃烧推进剂药柱和独特的应力缓冲衬套,这层衬套由合成橡胶软木夹层组成。全尺寸静态试验(达300秒)已经表明,在550磅/吋~2和200磅/吋~2压力区间內具有稳定的双压力级工作特性。用小尺寸和全尺寸燃气发生器在常规压力和双压力级下,对火焰温度范围为2200°F到3000°F的完全燃烧的推进剂进行了研制和成功试验。曾经进行了这种燃气发生器的主要元件的设计工作,这些主要元件包括有由6AL-4V钛合金或PRD49玻璃丝制成的轻重量外壳,合成橡胶内部绝热衬套和高温点火器等。     

固体燃气发生器过滤介质比较研究

为满足固体燃气发生器产生的燃气纯净以及降低温度的需求,在燃气发生器内设计过滤机构。通过对比玄武岩针刺毡过滤网、耐热金属丝编制网(钼网)、不锈钢丝压制网在燃气发生器内的性能表现,发现不锈钢丝压制网具有更全面的性能表现,适用于各种类型固体燃气发生器的残渣过滤及冷却降温。     

燃气发生器装药ICT检测研究

本文介绍了ICT检测技术在燃气发生器装药检测中的应用。通过优化ICT检测工艺,采用5 mm铜滤波板、增加叠加帧数等措施能有效地提高装药ICT检测质量,通过对燃气发生器装药内部典型缺陷进行ICT检测。结果表明, ICT检测技术能够实现对燃气发生器装药的准确故障定位和缺陷识别,是确保燃气发生器装药质量的重要检测手段。     

航天飞机用的肼类燃料燃气发生器性能

1982年11月,航天飞机进行了第五次飞行,这一次也是“哥伦比亚号”轨道器作首次商用任务飞行。在这次和前4次飞行试验中,火箭研究公司的单组元推进剂肼类燃料燃气发生器已成功地用来为辅助动力装置提供燃气。辅助动力装置利用燃气来驱动轨道器和固体助推器上的液压泵。本文概述了然气发生器在航天飞机任务中的应用、性能及技术要求,井就其工作时间、推进剂流量、起动和脉冲等方面实际性能作了简单介绍。一些燃气发生器已经受了曾经设想到的更为恶劣的环境条件。由于执行这五次飞行任务,燃气发生器已做过二次未预定修复工作,包括更换加热器和替换一个其催化剂床被污染了的燃气发生器。本文中还讨论了单组元推进剂燃气发生器首次成功地应用到多次飞行任务,包括经修复后能再次提供飞行使用的情况。     

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.