面向敏捷制造的产品数据管理框架研究

讨论21世纪制造企业的主要－－敏捷制造,分析面向敏捷制造的PDM功能需求,构建面向敏捷制造的PDM集成框架,并详细介绍面向敏捷制造PDM框架的功能模型和信息模型。     

面向敏捷制造的PDM系统的分析与UML建模

分析了面向敏捷制造的PDM系统的功能需求,构建了面向敏捷制造的PDM系统的体系结构和功能模型,并采用UML(统一建模语言)提出了系统的业务用例模型。     

集成化CAPP应用框架与开发平台CAPPFramework

产品结构管理是CAPPFramework的基本支撑模块，为工艺设计和管理提供产品结构信息，总体工艺和专业工艺都可以基于产品结构树进行设计和管理，实现了面向产品的CAPP，也是实现CAPP与CAD、PDM、ERP信息集成的核心。系统可以直接从CAD图纸明细表标题栏、PDM系统获取产品及零组件信息信息并建立产品结构树，避免重复输入，保证数据一致性。系统亦可通过手工输入方式建立产品结构树。     

面向敏捷制造的PDM角色管理研究

研究了面向敏捷制造的PDM角色管理。根据任务分解原理 ,提出了角色分层设置方法 ,使得盟主企业只需分配设计、制造、供应商等顶层角色 ,而下层角色由盟员企业自行分配 ,这不仅大大简化了动态联盟中的角色分配问题 ,也维护了盟员企业的自主性。在角色分配方法中引入招标 /竞标机制 ,使用层次分析法计算各竞标企业的分值 ,解决了角色分配过程中的定性指标的量化计算问题 ,使得角色分配有了科学的依据。根据制造角色与供应商角色的分配和产品设计之间的内在联系 ,将可制造性评价与角色分配有机地集成起来 ,由设计盟员根据竞标企业的实际能力进行可制造性评价 ,在选择最佳工艺路线的同时分配制造和供应商角色 ,不仅优化了设计 ,也改善了盟员企业间的合作关系。     

敏捷制造链快速构造的信息结构及其运行环境

基于WWW和Internet技术,通过敏捷制造链的快速构造与控制来实现敏捷制造是未来制造业发展的重要方式。本文针对未来产品异地设计、加工、装配等制造全过程中的组织、管理、信息、决策与控制方式,着重分析了敏捷制造链快速构造的过程和要求,提出了一种适合我国国情的敏捷制造链快速构造与运行控制的体系结构与总体方案,介绍了面向通用协作平台的敏捷制造链构造总体功能模型、相关设计方案和系统运行实例。     

面向网络化制造的敏捷企业绩效评价系统建模

基于企业建模框架，运用系统的方法，建立了面向网络化制造的敏捷企业绩效评价系统模型框架，以指导敏捷企业建立面向顾客需求、与企业竞争战略相关联的绩效评价系统。运用质量功能展开链（QFD-chain）的转换方法，给出了面向网络化制造的敏捷企业绩效评价系统设计方法及其过程模型。总结了面向网络化制造的敏捷企业绩效评价系统的实施步骤与关键成功因素，并通过实例说明了绩效评价系统与企业信息系统的集成。     

基于PDM的敏捷制造系统研究

面对激烈变化的市场要求，制造企业提出了基于PDM的敏捷制造系统，用PDM构建一个统一的企业数据库，使产品开发阶段的设计重用性迅速提高，企业内部的标准化程度更高，避免了每次都从头设计的传统设计模式。利用现代的信息技术和敏捷制造的理念。大力提高生产技术、管理和人力资源水平，使企业在激烈变化的市场中立于不败之地。     

面向制造网格的任务管理系统研究

为协调和共享制造网格中分布的资源，设计并实现了一个面向网格服务的任务管理系统。建立了该系统的功能模型和工作流程，定义了面向零件和组件加工任务的网格资源节点模型和任务模型；基于任务时间、成本和服务质量的约束，建立了任务分解规则和资源节点的匹配规则，设计了任务调度及状态监控方案；最后构建了系统实现的体系结构和信息交换过程。基于网格原理，系统各功能被封装为网格服务，通过任务管理中心实现对服务的调用。系统已被集成到某区域网络化制造服务平台，为企业提供了与制造过程相关的网格服务。     

PDM应用系统产品配置管理方法的研究

针对现有PDM产品配置管理功能的不足，阐述了PDM应用系统产品配置标识方法，该方法面向CIMS信息集成，通过扩展配置标识功能，支持企业产品资源平台构建；提出了一个PDM应用系统产品配置评价模型，该模型面向产品开发全过程，满足产品结构配置设计要求。以空调产品结构配置为例，介绍了所述方法在KELON-PDMS中的应用。     

面向敏捷制造的资源集成系统研究

着重讲述了一种面向敏捷制造的资源集成系统的机理和实现的关键技术，其中包括资源模型的建立、集成搜索系统与智能决策系统的实现，以及利用ＣＯＲＢＡ技术使系统具有兼容性。智能决策系统是以进化计算方法（主要是遗传算法）为基础。通过网络技术将不同地理位置的盟员资源集成起来，最佳对这些资源加以利用，为实现资源重构，进而实现敏捷制造奠定坚实的基础。     

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.