基于PDM的SMT企业工艺信息集成技术研究

提出了基于PDM的电子SMT企业CAPP系统的体系结构，分析了CAPP系统与PDM系统之间数据交换关系，研究了工艺系统结构化信息和非结构化信息与PDM系统的集成策略及实现技术。     

PDM中的关键技术

PDM是有效利用和共享企业信息资源的最佳方案。目前PDM的实施是一个Case -by -Case工程。叙述了PDM系统从开发、实施到在企业中全面运行过程中 ,所涉及到的网络技术、成组技术、数据库技术、组件技术等相关技术的现状、作用和实现方法。提出了方便用户操作的“零输入”方案和加快PDM实施的“零编程”方案。认为PDM成功实施的关键在于系统与企业现状的匹配程度。并预测PDM必然向系统的柔性化和通用化方向发展。     

产品设计质量控制工具与PDM信息集成研究

产品设计质量控制工具与PDM系统的信息集成已经成为企业CIMS实施中的新课题。为了在产品设计开发阶段实现不同粒度的质量控制信息的在线浏览、圈阅和共享流动等操作，有效地支持产品设计阶段质量控制，基于图像文件接口和XML数据接口提出一种产品设计质量控制工具与PDM信息集成框架，并在已有质量工具的基础之上，采用Windows位图编程技术实现了图像文件接口，最后给出该接口集成示例。     

PDM集成框架下CAPP与PDM的数据交换

根据CIMS信息集成的需要，提出了基于PDM环境的信息集成框架；探讨了在PDM集成框架下CAPP从PDM数据库中获取产品属性信息、产品结构信息和产品图形信息的方法；研究了CAD／CAPP／PDM系统中数据文档的格式和类型，并将不同格式的文档划分为无格式文档和有格式文档。据此，阐述了CAPP生成的工艺文档、工艺要素及属性信息在PDM框架下进行CAPP数据存储的一个模型和应用实例，从而实现CAPP和PDM的数据交换与信息集成。     

基于产品结构工作流的PDM与ERP集成

产品数据管理信息和企业资源管理信息构成了企业全局信息的两大组成部分，为了满足企业全局信息化的需要，必须有机集成PDM系统和ERP系统，充分发挥二者的作用，促使整个企业各部门协调工作，保持企业的竞争能力。从分析PDM和ERP的差别和PDM与ERP集成的困难所在着手，提出了以产品BOM为基础，来实现基于产品结构工作流的PDM与ERP集成。根据产品全生命周期的要求，逐步完成从设计、生产到销售的信息集成、功能集成和过程集成，就可以实现企业集成目标。     

面向制造业的PDM通用信息集成系统

以制造企业中信息集成为目标 ,研究支持设计信息与管理信息及生产信息集成的一般方法与技术。论文首先从企业信息集成的需求出发 ,分析并建立了制造型企业中产品信息模型 ;随后在 CIMS应用集成平台体系结构的基础上 ,设计了一个面向制造业的 PDM通用信息集成系统 ,阐述了系统的设计原则 ;建立了该系统的功能结构并阐述了其功能 ;最后探讨了系统实现的关键技术 ,并给出了系统实现的环境     

CIMS环境下ERP与PDM的集成研究

通过对CIMS发展方向和特点分析,提出EILP与PDM集成的必要性,分析了EILP与PDM集成的内容和交叉过程,提出了四种不同的集成模式,针对不同模式的差异性进行了研究,进而提出基于COM的信息集成技术,可以在间接模式适用.提出基于COILBA的集成技术,它是在统一界面下对中间接口实现的信息集成.提出基于STEP的信息集成技术,它是通过对底层数据库的集成来实现两个系统的集成.为企业的发展提供了可借鉴的模式和集成技术.     

基于PDM系统的中小型企业CAPP系统研究与实现

根据中小型企业产品数据管理和工艺设计要求,结合某一企业CAPP项目的需求,基于内蒙古工业大学PDM系统的CAPP系统平台,提出了基于PDM系统的中小型企业信息系统的开发方案与集成方案。分析了系统体系结构和信息流程,实现了工艺设计过程与PDM系统功能的有机结合,工艺过程设计灵活快捷,具有较好的实用性和通用性。     

PDM与Solid Works接口式集成技术的研究与应用

近年来基于接口的集成模式在PDM与Solid Works集成中应用越来越广,而如何实现接口及接口实现的关键技术成为了研究热点。通过比较和分析现今的数据库操作技术、文档上传技术以及COM技术,提出了在现有VC＋＋可视化集成开发环境中,基于ADO、FTP、COM以及Solid Works API来实现接口开发的技术模式最后由一个实例来演示通过COM技术和Solid Works API来实现接口对Solid Works信息的提取,通过ADO技术来实现接口将提取的信息导入PDM并搭建产品的BOM结构,通过FTP技术来实现相关文档的上传．从而在整体上实现了基于接口的PDM与Solid Works的有效集成．     

分布式企业PDM系统集成框架研究

在复杂产品协作开发过程中，如何实现通讯管理、实时交流和产品数据共享已成为亟待解决的问题。本文提出了基于Web公共信息交换平台、面向分布式产品数据信息集成与管理的集成框架——分布式企业PDM系统集成框架，并建立了多层应用体系结构，利用面向对象的思想和统一建模语言，对分布式企业PDM系统集成框架的核心逻辑层进行了详细的分析与建模，最后介绍了基于分布式企业PDM系统集成框架协作产品开发的应用服务功能。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.