PD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得一个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必须向系统的柔性化和通作化方向发展。     

企业实施图文档管理系统的关键技术

图文档管理系统是产品数据管理(PDM)的核心部分,企业在开发、实施PDM系统过程中,涉及到网络技术、成组技术、数据库技术、组件技术等相关技术,这些技术的应用现状和实现方法引领PDM向通用化的方向发展.因此,中型制造企业应该有计划有步骤地实施图文档管理系统,为下一步实施PDM打好基础.     

PDM 快速实施辅助系统

结合PDM技术在我国实施应用的现状，划分了实施的层次水平；深入分析了企业实施PDM的共性与特性；提出了用户相关度的概念，并基于模块化设计原则与用户相关度概念，对PDM开发与实施进行了模块划分与不同相关度分类。在此基础上，提出了PDM快速实施辅助系统的体系结构，阐述了实现该体系结构的关健技术，包括PDM—CAx信息集成的通用模型与通用接口开发技术、PDM与企业全局数据库信息集成的通用接口的实现技术、PDM与企业全局数据库数据模型映射定义工具的实现技术与PDM用户定制系统的开发技术，并给出了各部分的功能结构。     

大型企业PDM系统的设计与分析

通过对A集团产品数据管理 (PDM )分系统的设计与分析 ,提出了大型企业集团中PDM的体系结构、集团总部PDM的系统方案和集团范围内PDM的系统规划。这些对于准备实施PDM的大型企业具有很好的借鉴作用     

大型企业PDM系统的设计与分析

通过对A集团产品数据管理（PDM）分系统的设计与分析，提出了大型企业集团中PDM的体系结构、集团总部PDM的系统方案和集团范围内PDM的系统规划。这些对于准备实施PDM的大型企业具有很好的借鉴作用。     

PDM与ERP集成应用

随着企业信息化建设的不断推进,越来越多的企业开始实施应用PDM与ERP系统。实施企业、软件供应商必须面对PDM和ERP如何集成的问题。采取何种技术方法实现PDM与ERP系统的有效集成已成为众多人关注的焦点。此集成技术已经在多家企业的PDM与ERP系统集成项目中得到了成功应用,实践证明是行之有效的。     

企业如何建设PLM系统?

PLM是一种对所有过去的、现在的、那些行之有效的技术、系统、流程、实施方法论和企业智力资产的继承与集成，在正确的企业战略思想和商业原则的指导下．将其提升到符合企业实际情况的解决方案，让企业信息化变得更加现实和更容易实施。它不应该被理解为是由多种CAx加上PDM系统撮合到一起的所谓“集成”系统。     

面向敏捷制造业的 PDM技术

敏捷制造是二十一世纪的必然制造模式，阐述了PDM是实施敏捷制造的关键，分析了PDM在敏捷制造中的要求，研究现状，所起的作用以及实施中有关的技术问题，并指出我国企业信息系统要建立开放式信息系统以利于PDM技术的实施。     

PDM与ERP的数据集成方案应用研究

BOM是PDM、CAPP和ERP系统集成的核心。本文对PDM与ERP的2种接口集成方案作了详细的阐述,较好地实现了从EBOM到MBOM的数据转换和集成。指出了2种PDM与ERP集成方案的优缺点,为企业PDM与ERP的集成选型提供了依据。     

试金集团CAD/CAPP／PDM／ERP系统信息集成的解决方案

CAD／CAPP／PDM/ERP系统是企业信息集成的重要组成部分,是集成的关键技术之一。本文针对企业信息化现状和存在的问题,介绍了CAD／CAPP／PDM／ERP系统的概念,提出了CAD／CAPP／PDM／ERP各子系统信息集成的方法;阐述了CAD／CAPP／PDM／ERP系统的实施步骤,为企业信息化提供一套信息集成的解决方案。     

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...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.     

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.