并行工程技术在机床制造业的应用

并行工程是一种系统化的工作模式,与现代计算机技术的有机结合是并行工程理论与应用的发展趋势,它强调产品全生命周期各个相关阶段的集成开发与优化.论述了并行工程及其关键技术、实施方法等,介绍了并行工程技术在机床制造业中的应用.     

并行工程在航空企业中的应用

串行工程和并行工程是不同企业所实施的不同方法。论述了航空企业在生产各阶段实施串行工程所存在的不足及实施并行工程的优点,提出了实施并行工程的思路。     

并行工程及其关键技术

并行工程的实施,对提高企业的竞争力起到重要的作用.本文介绍了并行工程的概念、特点、实施环境、应用实例,重点讨论了实施并行工程的关键技术.     

并行工程及其关键技术的研究

并行工程的实施，对提高企业在世界市场中的竞争能力将起到重要的作用。本文介绍了并行工程的概念，讨论了并行工程的目标、核心和并行工程的实现方法与技术，重点讨论了设计自动化中实施并行工程的关键技术     

并行工程及其关键技术

并行工程的实施，对提高企业的竞争力起到重要的作用。本文介绍了并行工程的概念，特点，实施环境，应用实例，重点讨论了实施并行工程的关键技术。     

基于并行工程的电动汽车锂电池开发研究

阐述了并行工程的发展和理论,比较了并行设计流程与串行设计流程的不同之处,提出实施并行工程在新产品开发过程中带来的成本优势和效率优势.结合F电动汽车企业的实际案例,梳理了电动汽车企业锂电池开发的现有流程并提出了基于并行工程的设计流程,定量比较实施并行工程前后锂电池设计周期的差别和设计成本的差别,得出并行工程在电动汽车锂电池开发中的优势,展望了并行工程理论在其他领域的应用价值和前景.     

面向并行工程的碟簧产品设计系统研究

并行工程是对产品及其相关过程进行并行、一体化设计的一种系统化工作模式。并行工程中的核心思想是并行设计思想 ,他是传统的设计理论与方法的继承、延伸与扩展 ,他的形成依赖于计算机技术、信息网络技术、现代制造技术的发展和应用。基于并行工程的思想和方法 ,针对碟簧产品设计的特点 ,基于网络环境 ,建立面向并行工程的碟簧产品开发系统 ,对碟簧产品的并行设计过程、相关支持技术和组织管理模式进行研究 ,以期为企业提高生产经营能力提供一些有益的帮助。     

PDM在并行工程中的应用实例

产品数据管理作为并行工程的使能技术 ,在并行工程实施中起到集成框架的作用 ,实现统一、安全、高效的产品信息和产品过程信息的管理 ,有效地加快产品的开发。结合PDM产品Pro/Intralink(Pro/I)在企业中的实施 ,分析了以Pro/I为集成平台的信息协同环境的建立及其在并行工程中的实际应用模式 ,为PDM技术在企业中的应用提供有益的借鉴和帮助。     

并行工程总体技术及实施方法研究

自并行工程的概念引入我国以来，迄今已取得了相当的进展，越来越锪企业提出了对并行工程的需求。但对并行工程方法学和关键技术缺乏统一认识，特别是我国企业在现有条件下以ＣＩＭＳ信息集成为基础，实现并行产品开发还没有可参考的依据。本文根据作者从事８６３／ＣＩＭＳ重大关键技术攻关项目“并行工程”研究的经验，总结了并行工程最核心的方法学和技术，提出了实施并行工程的一般途径，为我国航空，航天、汽车、机床、电子等领     

论并行工程及其应用实例

文章对并行工程进行了概述，介绍了并行工程的含义，论述了并行工程原理、特点及实施过程，分析了实施并行工程的主要因素，在此基础上给出了并行工程明确的定义。将并行工程基本原理应用于科学仪器共用网络体系结构建立和设计中，说明了并行工程的应用过程和应用技巧。论述了应用并行工程实施科学仪器共用网络建设的特点和设计过程。     

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...     

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。     

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。     

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.     

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.     

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。     

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.     

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....