项目管理与PDM集成技术研究

讨论了项目管理思想和技术在产品开发中的应用，分析了现有PDM系统和PM系统的各自功能特点以及系统集成需求，构造了PM系统与PDM系统的集成框架，并详细研究了各集成接口模块的工作原理。最后，应用组件技术开发了PM系统与PDM的集成接口模块，实现了Project 2000与Smar Team的集成。     

基于PDM的滚动轴承CAPP开发

本文提出基于PDM的滚动轴承CAPP的框架，介绍了系统的组成模块及其功能，并分析了所采用的关键技术。     

基于组件的PDM流程的可视化实现

在分析现有流程设计的基础上，对采用组件技术的ＰＤＭ流程可视化表示方法的开发作了研究与分析，对能满足ＰＤＭ系统功能需求的、且可生存于分布异构网络环境的可视化流程设计软件系统的开发作了探索，并对该系统的结构组成与实现方法作了介绍。     

一种适应虚拟企业环境的CAPP系统结构

简要分析了虚拟企业的特点，讨论了其对CAPP的要求，并开发了一个可用于虚拟企业环境的CAPP系统。该系统充分体现了集成化，智能化和开开性的特点，在PDM集成环境下能够实现制造资源的动态配置，提供多种工艺决策方式，强调系统的柔性和可扩充性，利用该系统还可以对虚拟企业的组建提供专业性的辅助决策。     

某船舶研究所PDM系统的定义与开发

本文分析了某船舶研究所的PDM系统功能需求,说明了该系统的总体功能划分.介绍了基于元模型的平台架构,根据用户需求实现某船舶研究所PDM的定义与开发,包括元模型定义、U1元界面定义、行为传播定义.基于定义文件的解析,生成船舶PDM系统的数据库和应用界面.最后阐述了采用元模型驱动的PDM系统的意义.     

GT在PDM系统中的实现与应用

以ＳＤＲＣ的Ｍｅｔａｐｈａｓｅ３．０软件的环境为背景，介绍了ＧＴ在ＰＤＭ系统中实现两种功能的过程。     

网上通用产品配置设计工具的研究

主要介绍一种新的网上通用产品配置设计工具。用户可以利用该工具直接在网上建立和维护自己企业定制的产品配置设计系统，而不需要进行专门的编程。网上的产品配置设计系统包括按功能的产品配置设计和按结构的产品配置设计，一般用户可以在该系统上进行各种产品的配置设计。该工具能有效地支持企业利用因特网进行大批量定制生产。     

基于Web的PDM系统研究

在探讨PDM系统发展趋势的基础上，重点介绍了基于Web的交互式PDM系统研究。该系统前台采用ASP技术，后台数据库采用多层分布式网络体系结构，使用户根据权限不仅能通过Web页浏览、生成和修改来自PDM的图形、数据等信息，而且能够访问来自MRP、采购、销售和财务等信息。同时，在登录PDM系统时，所有程序均在Web服务器端动态运行，对用户方的要求很低，可大大提高系统的运行能力。详细介绍了系统的体系结构、功能、特点及实现的关键技术，为我国制造业信息化实施B／S模式管理提供了参考。     

PDM实施过程中的非技术因素研究

讨论了PDM实施在PDM系统中的重要性，分析了PDM在实施过程中的各种非技术因素，在此基础上建立了PDM分层实施模型，该模型能够清楚表达PDM实施中各种技术和非技术因素的联系，指导PDM在各个阶段的实施，协调实施方和被实施方人员之间的沟通，使实施过程能够在有限的外部资源约束下最大限度地朝着双方所期望的方向发展。     

PDM系统在企业中的应用和实施技术

对产品数据管理（PDM）系统在企业中的应用和实施进行了研究，分析了PDM的功能模型和实施中的一些关键技术，并指出了企业在实施PDM系统时应注意的问题。     

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.