PLM的内涵和功能分析

详细评述了PLM技术的发展过程，分析了PLM的价值和功能，表明了PDM与PLM之间的联系和差异，指出PLM的主要内涵和主要功能，介绍了PLM工具平台的特点和主要厂商的PLM产品现状，并对企业导入PLM系统进行了一定的思考。     

CAXA PLM解决方案发布会在京举行

2006年9月26日，我国制造业信息化领域主要的PLM方案和服务提供商CAXA在北京召开CAXA PLM解决方案发布会，推出了CAXA PLM全线解决方案：CAXAA5 PLM和CAXA V5 PLM两个系列及其PLM扩展应用系列解决方案，并展示了CAXA PLM方案在各行业的成功应用案例。30多家来自大众媒体、工业类媒体和IT类媒体的新闻记者及行业专家50余人出席了发布会。     

CAXA全线进入PLM

2006年9月26日，CAXA在北京召开CAXA PLM解决方案发布会，推出了CAXA PLM全线解决方案，CAXA A5 PLM和CAXA V5 PLM两个系列及其PLM扩展应用系列解决方案．并展示了CAXA PLIM方案在各行业的成功应用案例。     

CAXA总裁雷毅博士发布CAXA PLM解决方案

目前，中国制造业企业CAD应用已经非常普及，PLM也在不少企业获得了很好的应用，越来越多的企业期望在单元CAD／CAM应用的基础上构建集成应用系统，提升企业的竞争能力。我国制造业信息化领域的PLM方案和服务提供商CAXA顺势而动，积极响应企业的需求，重新整合和架构其PLM解决方案。2006年9月26日，CAXA总裁雷毅博士在京宣布推出CAXA PLM全线解决方案：CAXA A5 PLM和CAXA V5 PLM两个系列及其PLM扩展应用。CAXA PLM全线解决方案的正式发布，标志着CAXA PLM业务迈上新的台阶，进入了成熟的发展阶段。CAXA也从CAD／CAM产品型公司发展成为全面的PLM方案和服务提供商。     

窥探UGS PLM Solutions易主幕后

2003年11月EDS公司正式将其旗下子公司EDS PLM Solutions更名为了UGS PLM Solutions，成为当时业界广为传播的热门话题。正当人们对EDS的举措纷纷猜测其将大张旗鼓力推PLM业务之时，2004年3月14日又传来了私人投资集团以20．5亿美元现金将UGS PLM Solutions(原EDS PLM Solutions)收购的消息，这一具有     

产品全生命周期管理系统体系结构研究

介绍了PLM系统的概念以及它在企业信息系统中的地位，同时对典型的PLM系统的体系结构和其中的关键技术进行了描述，并提出了基于统一数据模型的PLM结构。     

应用PLM进行制造业企业信息化建设

阐述了PLM的概念及其发展情况，根据产品的生命周期规律说明企业实行PLM的必要性及总体战略，通过Chrysler公司的汽车虚拟制造与UGSPLM应用的案例说明PLM技术的杰出应用效果。     

如何借助PLM模式支撑中央空调企业创新

结合全球市场竞争的环境，对企业核心竞争力以及企业信息化建设进行了深入分析，通过企业竞争力与信息化模型的论述、PLM意义的阐述，对PLM如何提升企业创新能力尤其是中央空调企业的创新能力进行了深入探讨，提出了产品全生命周期管理PLM在领航企业创新方面主导地位的论点。     

如何借助PLM模式支撑中央空调企业创亲

结合全球市场竞争的环境，对企业核心竞争力以及企业信息化建设进行了深入分析，通过企业竞争力与信息化模型的论述、PLM意义的阐述，对PLM如何提升企业创新能力尤其是中央空调企业的创新能力进行了深入探讨，提出了产品全生命周期管理PLM在领航企业创新方面主导地位的论点。     

"PLM时代"的PDM技术和软件产品

近两三年以来，“产品全生命周期管理（PLM）”迅速从少数国外“高端”CAX软件厂商（诸如UGS、PTC、迭索、IBM）大力宣传的概念发展为国内媒体，专家软件开发商争相追捧的对象，包括一些在PLM市场中迟迟态度不明者（诸如美国Autodesk）也终于加入其中。其间，部分国内制造业企业也开始被PLM概念所吸引，似乎PLM是解决其企业核心竞争力问题的关键所在。制造业信息化的潮流几乎一夜之间进入了“PLM时代”。     

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.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.