采用灰度直方图的孔型识别和二值化阈值自动匹配

通孔和盲孔图像差异大,可根据图像计算出各灰度值的概率分布,通过灰度直方图完成孔型识别和二值化阈值匹配.由像素点概率分布计算各灰度值概率,作出反映灰度值像素点在图像中所占比例的孔型像素灰度直方图.突出通孔和盲孔灰度值集中部分的百分比,得到孔的直方图.二值化阈值匹配,通孔按灰度直方图算出的两峰间最佳阈值得到,而盲孔用大津法求解.     

正态分布转换算法在声纳图像处理中的应用

根据声纳图像匹配处理的实时性需求,研究了正态分布转换算法。该方法基于对图像中目标点的概率分布进行匹配,不需要提取图像的几何特征或灰度特征,可有效缩短匹配时间。通过对均值滤波法、中值滤波法、小波去噪法、形态学平滑法4种图像去噪和迭代阈值法、最大熵法、一维Otsu法和二维Otsu法4种分割算法,进行仿真并对比,选出符合实时性处理的方法,即中值滤波法和一维Otsui法。基于美国德州仪器公司的数字信号处理芯片,将图像去噪、分割和匹配算法在硬件上实现,硬件实现结果和仿真结果一致,实现了声纳图像匹配的实时处理。     

一种抗区域强灰度变化的景象匹配算法研究

对比分析了灰度强烈变化对图像统计特征的影响.针对在灰度强烈变化条件下,基于直方图、灰度矩阵和图像纹理特征的匹配算法的不适应性,提出了一种基于边缘特征的抗区域灰度强烈变化的景象匹配算法.仿真结果表明,该方法能有效地克服灰度强烈变化对景象匹配性能的影响,与基于灰度的积相关匹配算法相比,在匹配时间大大缩短的同时,匹配概率也有了较大提高.     

基于图像匹配的无损变形测量

在传统网格法的基础上,给出一种基于图像匹配的无损变形测量新方法。该方法以图像的亚像素匹配为关键技术并采用虚拟网格的思想。在测量时,不用在待测物体表面预制任何标志,而是利用试件表面的数字图像的灰度特征形成虚拟网格,利用区域匹配算法完成全场的位移测量;再按照网格法中的应变计算方法得到位移转变成应变。典型拉伸实验证实,该方法与传统网格法的测量结果一致。     

投影相关匹配算法

二维投影相关法是基于二维投影的灰度相关匹配算法,主要利用匹配图像相邻像素的灰度值的大小关系应该相同的原理进行图像匹配。该算法不仅大大减少了数据的维数,而且算法主要涉及（0,1）整数运算。与去均值归一化互相关算法（Nnprod）相比,其在保证匹配精度要求的前提下提高了匹配速度。     

自控终点误差与目标散布下反舰导弹捕获概率分析

在简化导弹攻击场景基础上,对自控终点误差、目标散布和现在点射击方式三者进行了综合讨论,建立了目标捕获模型.提出了计算捕获概率的七个步骤,利用该方法计算出典型场景下自控终点散布区内捕获概率分布,并用灰度图和等概率线形式进行表述.分析了影响捕获性能的相关因素,并提出了提高捕获性能的基本思路:减小自控终点误差,降低对搜索扇面的要求.     

基于对应像素距离度量的图像匹配跟踪算法

结合最小绝对差度量MAD和Hausdorff距离度量的基本思想,提出了一种新的对应像素距离相似性度量方法的图像匹配算法和自适应模板图像匹配跟踪算法,并对对应像素距离相似性度量方法的图像匹配算法的匹配跟踪性能进行分析.对这2种算法的匹配跟踪性能参数的实验结果进行比较.实验结果表明:对应像素距离相似性度量方法的图像匹配算法具有较强的抗噪、抗畸变能力和稳定性,具有较高的匹配精度和匹配概率.     

基于互信息量的小幅员目标图像匹配

针对地面打击精确制导过程中小幅员目标难以检测和识别的问题,建立了一种基于互信息量最大的多模态图像匹配技术,对小幅员目标的典型目标特性进行了分析和总结。基于此,提出了多模态图像匹配策略,并设计了相应的匹配检测流程。通过仿真分析,利用实测的光学图像和红外图像进行了匹配分析,证明了模型与算法的可行性。     

基于一种快速归一化积相关算法的图像匹配研究

在灰度图像匹配中,归一化积相关算法具有鲁棒性强、精准度高和易于硬件实现等优点。但算法复杂、计算速度慢是制约其应用的主要原因。基于迭代的思想提出了一种快速归一化积相关算法。该方法在计算基准子图图像能量时,只通过几个像素值的加减运算,便可快速实现基准子图像素求和,大大降低了计算的复杂度。实验证明,本算法与原算法具有相同的匹配精度,但计算时间仅为原算法的1/9.     

基于灰度的图像快速匹配算法

对几种常见的基于灰度的图像匹配算法(如相关匹配、投影匹配、字符串匹配、Hamming距离、图像边缘提取)进行了试验和比较,提出了一个精度较高、速度较快的一种匹配方法,取得了较好的效果.     

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.     

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.     

Overview of Anti-tank Mines

First the different anti-tank mines laying possibilities are shortly summarized： hand emplaced, with mine layers, ground or helicopter relatively topographical well defined, and with cluster systems of projectiles, rockets and aircraft dispensers. Then examples of the three generations of anti-tank mines are presented：Ⅰ generation： detonating only beneath the track; Ⅱ generation： detonating beneath the track and belly; Ⅲ generation： mines with off-route actions. Weight and cost comparisons are strongly favoring the off-route Ⅲ-generation mines.     

A Finite Element Analysis on Static Strength of a Complex Section

A static finite element analysis （FEA） of an impulsive controller section is presented. The boundary condition and a part of the loads are applied. Considering the grades of the stress around the holes being large, the dense grids are adjusted accordingly. Four cases with different loads are compared, thus the influences of different loads on the section are analyzed. Numerical results show that the maximum stress of the section is lower than the strength limit of the material, and the section will not be broken with the static loads.     

Discussion on Mechanism of Breech-Blow Caused by Propellant Charge

From the view point of launch safety caused by fracture of propellant charge, this paper points out that the safety criterion of pressure wave is inadequate to evaluate the launch safety of propellant charge based on the initial negative differential pressure and sensitivity tests. Generally, the maximum barrel pressure does not depend upon the intensity of pressure wave correspondingly. The pressure wave intensity can not describe the fracture degree of propellant charge in chamber and reflect the mechanical environment of propellant charge fracturing exactly and wholly. The evaluation criterion for launch safety of propellant charge should be built on the basis of depicting the fracture degree of propellant bed.     

Experimental Studies of Toxicity on HNIW and Its Intermediates

The polycyclic nitramine hexanitrohexaazaisowurtane（HNIW） is a compound of high energy density. HNIW can replace 1, 3, 5-trinitro-1, 3, 5-triazacyclohexane（RDX） or HMX, hut its toxicity is unknown. In this paper, HNIW, hexabenzylhexaazaisowurtzitane （HBIW）, tetraacetyldibenzulhexaazaisowurtzitane （TADBIW）, tetraacetyldiformylhexaazaisowurtzitane（TADFIW） and tetraacetylhexaazaisowurtzitane（TAIW）, which are intermediates of the synthesis of the HNIW, were selected as the tested objects in acute toxicity test, acute eye stimulation test and skin irritation test according to the standards of ＂chemical product testing method-401 ： acute oral toxicity test＂, ＂chemical product testing means-405： acute eye irritation/corrosion test＂ and ＂chemical product testing means-404： acute dermal irritation/corrosion test＂ of National Circumstance Protect Bureau. The results show that all of the five objects have no toxicity, no stimulation to eye and skin under the tested conditions.     

Dynamic Simulation for Missile Erection System

In order to study the dynamic characteristics of the missile erection system, it can be considered as a rigid-flexible coupling multi-body system. Firstly, the actual system is abstracted as an equal and simplified one and then the forces applied to it are analyzed. Secondly, the rigid-flexible coupling dynamic simulation for erection system is accomplished by use of the system simulation software, for example Pro/E, ADAMS, ANSYS, MATLAB/Simulink, etc. Finally, having the aid of simulation results, the kinetic and dynamic characteristics of the flexible bodies in erection system are analyzed.The simulation considering the erection system as a rigid-flexible coupling system can provide valuable results to the research of its kinetic, dynamic and vibrational characteristics.