再制造系统中的计算机支持技术

论述计算机支持技术在再制造产品形成中的应用 ,其中包括面向产品服役环境与可拆卸、可再制造的工程设计技术 ,涂层结合强度、失效机理、优化设计方面有限单元法计算技术 ,容器整体热处理过程的计算机模拟技术等。     

蓝牙技术在野外现场维修支援中的应用研究

介绍了一种基于蓝牙无线网络技术支持的野外现场维修支援系统总体结构、通信部分软硬件结构和安全管理技术。     

飞机损伤修理远程技术支援系统的设计与实现

从飞机损伤修理远程技术支援系统的功能需求出发,介绍了系统的设计思想及其软、硬件子系统的构建目的、原则和系统组成等内容。     

基于"计算机支持协同工作"的先进制造技术管理平台的研究

先进制造技术管理平台是一个协同工作过程，计算机支持的协同工作是利用计算机及其网络提供一个协同工作的环境，使为完成共同任务而合作的群组成员能有机地结合、有效地合作。为了构建先进制造技术管理平台，建立了基于“计算机支持协同工作”的先进制造技术群组活动模型和基于“计算机支持协同工作”的先进制造技术管理平台。     

雷达维修保障远程技术支援信息系统设计与实现

随着通信技术、网络技术和多媒体技术的不断发展,雷达维修保障远程技术支援信息系统作为对现行三级雷达维修体制的重要补充和发展,在高科技战争中将占据越来越重要的地位.基于网络的技术支援信息系统打破了三级雷达维修体制在时间、地点和形式上的重重羁绊,实现了雷达维修数据和资源的共享与远程专家会诊,在基地级修理机构和故障雷达站之间架...     

汽车油耗检测的计算机联网技术初探

本文介绍结合汽车安全检测线车速台以及脉冲式液体流量计进行汽车油耗检测的方案,并对在实现过程中遇到的关键技术进行讨论。     

基于ASP.NET技术的飞机产品支援综合信息系统开发

针对某航空企业飞机产品支援工作的现状和信息管理系统的发展趋势,开发了基于ASP.NET技术的飞机产品支援综合信息系统,以实现飞机产品支援工作所需信息的有效管理,确保用户在飞机的全生命周期内,及时迅速得到生产企业的支援工作,保障飞机的正常使用,同时规范飞机产品支援管理,提高产品支援的工作效率。     

计算机支持协同工程设计系统的集成模型和实现方法

计算机支持协同工程设计(CSCED)是计算机支持协同工作(CSCW)的一个分支,计算机支持协同工程设计系统(CSCEDS)是CSCED的具体实现。文章在介绍CSCEDS技术的基础上,阐述了CSCEDS的集成模型和实现方法。     

支持企业信息化的计算机辅助产品创新设计技术

提出了新产品设计过程的一般模型，从信息化角度，把计算机辅助工程引入产品创新设计，并把基于TRIZ原理的CAI软件作为产品创新设计的工具，讨论了开发计算机辅助创新软件的研究内容和策略。     

P2P僵尸网络的新型数学模型

P2P僵尸网络已成为互联网安全领域最严重的威胁之一。为了有效地遏制P2P僵尸网络,本文提出刻画P2P僵尸网络形成过程的一种新模型,该模型是带时滞的SEIR模型。基于特征方程特征值的分布范围,分析了模型在平衡点的局部稳定性。理论分析和数值模拟结果都表明,该时滞模型的动力学特征依赖于基本再生数尺。和时间延迟r。本文的结果有助于更好地了解P2P僵尸网络的传播行为,并据此设计有效的反制措施。     

Large-scale, uniform DNA network on 11-mercaptoundecanoic acid modified gold (111) surface: atomic force microscopy study

Large-scale, uniform plasmid deoxyribonucleic acid (DNA) network has been successfully constructed on 11-mercaptoundecanoic acid modified gold (111) surface using a self-assembly technique. The effect of DNA concentration on the characteristics of the DNA network was investigated by atomic force microscopy. It was found that the size of meshes and the height of fibers in the DNA network could be controlled by varying the concentration of DNA with a constant time of assembly of 24 h.     

A typical process route discovery method based on clustering analysis

A typical process route is a sample of planning the process route. It is a kind of the process planning knowledge. In order to discover the typical process route in the process planning database from the Computer Aided Process Planning (CAPP), Knowledge Discovery in Database (KDD) is applied. Process data selection, process data purge and process data transformation are employed to get optimized process data. The clustering analysis is adopted as the algorithm mining the typical process route. A mathematics model describing the process route was built by the data matrix. There are three similarities in process route clustering: the similarity between operations was measured by the Manhattan distance based on operation code; the similarity between process routes was calculated by the Euclidean distance and expressed as a dissimilarity matrix; the similarity between process route clusters was evaluated by the average distance based on the dissimilarity matrix. Then, the process route clusters were eventually merged by the agglomerative hierarchical clustering method. And the process routes clustering result was determined by the clustering granularity of process route. This method has been applied successfully to discovering the typical process route of a kind of axle sleeves. This project is supported by the National High-Tech. R&D Program for CIMS, China (Grant No. 2003AA411041).     

A study on the development of in-process dressing lapping wheel and its evaluation of machining characteristics

Ceramics, carbide, and ferrite are widely used due to their significant mechanical properties such as light weight, chemical stability, super wear resistance, and electronics. Despite these characteristics, this material is not widely used for its difficulty in machining material. Therefore, the method of using a metal bonded wheel was proposed. However, a metal bonded wheel is difficult to dress. Recently, a new technology is being developed for In-Process Electrolytic Dressing to solve this problem. This technology provides dressing for metal-bonded wheels during the lapping process for in-process lapping of protruding abrasive from super-abrasive wheels. This method requires a wheel for electrolytic dressing, a power supply, and an electrolyte. A cast iron bonded diamond (CIB-D) wheel is dressed by electrolytic dressing and its electrolytic characteristics are evaluated. This study produced an ultra-precision lapping machine for in-process electrolytic dressing using super-abrasive CIB-D applied for lapping ceramics, sintered carbide, and optical glass.     

融合智能体和特征技术的焊接结构件CAPP集成系统研究

针对焊接结构件制造过程中涉及工种众多、工作环境异构的特点 ,提出一种融合智能体和特征技术的CAPP集成系统构造方法 ,使多工种 CAPP与 CAD、CAM信息集成的同时 ,其内部各工种 CAPP之间达成协调决策、集成与并行。在此基础上 ,建立了焊接结构件 CAPP的功能模型和系统集成框架。     

A study on stress analysis of orthotropic composite cylindrical shells with a circular or an elliptical cutout

The stress analysis on orthotropic composite cylindrical shells with one circular or one elliptical cutout subjected to an axial force is carried out by using an analytical and experimental method. The composite cylindrical shell governing equation of the Donnell's type is applied to this study and all results are presented by the stress concentration factor. The stress concentra-tion factor is defined as the ratio of the stress on the region around a cutout to the nominal stress of the shell. The stress concentration factor is classified into the circumferential stress concen-tration factors and the radial stress concentration factors due to the cylindrical coordinate of which the origin is the center of a cutout. The considered loading condition is only axial tension loading condition. In this study, thus, the maximum stress is induced on perpendicular region against axial direction, on the coordinate. Various cutout sizes are expressed using the radius ratio,, which is the radius of a cutout over one of the cylindrical shell. Experimental results are obtained using strain gages, which are attached around a cutout of the cylindrical shell. As the result from this study, the stress concentration around a cutout can be predicted by using the analytical method for an orthotropic composite cylindrical shell having a circular or an elliptical cutout.     

基于小波变换、二维主元分析和EBF神经网络的指纹识别方法

指纹识别是模式识别中的一个十分重要课题。结合小波变换(WT)、二维主元分析(2DPCA)和椭球基函数（EBF）特点,本文提出了一种基于WT和2DPCA的EBF神经网络指纹识别方法。首先,利用小波变换将原始图像分解为高频分量和低频分量,并忽略水平高频与垂直高频分量,获得原始图像的基本特征。然后,通过2DPCA算法对该图像进行降维,获取降维特征;最后结合椭球基函数神经网络(Ellipsoidal Basis Function Neural Network, EBFNN)完成指纹识别。本算法将2DPCA优化的特征提取与EBFNN的自适应性相结合,在FVC2000（国际指纹竞赛数据库）上作了测试。并与WT-PNN算法和WT-2DPCA-RBF算法进行比较。实验结果表明,本文提出的算法在平移、旋转及光照变化的指纹数据库上的识别效果优于WT－PNN算法和WT-2DPCA-RBF算法。     

SMT-TAB: A process planning system for PCB assembly using TAB and SMT

Process planning is a critical function in any manufacturing domain. This is especially true in the electronics manufacturing area where substantial heuristic and experiential knowledge is commonly used during process plan development. While research in computer-aided process planning (CAPP) has tended to concentrate in the machining realm, few CAPP systems have been developed for electronics manufacturing applications and more specifically for the printed circuit board (PCB) assembly domain. Besides, the CAPP systems that have been developed for this area have dealt with either insertion mount or surface mount PCB assembly processes only.Tape automated bonding (TAB), though a relatively new technology, is gaining importance in electronics assembly owing to its inherent advantages. The advent of fine pitch technology together with the ever increasing need for more inputs/outputs and greater pin counts in integrated circuit applications has enhanced the use of TAB technology in electronics manufacturing. This trend has been further augmented by the increasing need for compactness in consumer electronics.This research designed and developed a prototype CAPP system for the PCB assembly domain. The system developed generates a process plan for PCBs populated with surface mount and/or TAB components. An artificial-intelligence based expert system approach has been used in the design and development of the CAPP system. Outputs generated by the system are presented along with ideas for future research.     

Set-up time reduction process and integrated predetermined time system MTM-UAS: A study of application in a large size company of automobile industry

Higher quality and efficient production requires newer production methods and ideas. Newer methods contain newer problems that must be solved. As lean manufacturing was introduced to production environments, an important question occurred. What must be done to reduce the setup time? Shigeo Shingo tried to solve this problem by his methodology called SMED. In this text, an important success factor for setup times “sustainability” is taken into consideration. Here sustainability is used as keeping the success level achieved by using SMED at a desired point and not letting it to drop down. To achieve desired sustainability well-arranged standard procedures must be prepared. In this text an optimal changeover procedure is constituted with the aid of a predetermined time system (MTM-UAS) to standardize and preserve the improved changeover operations.