RFID技术在汽车变速器生产线上的应用

介绍了某汽车变速器厂家在物流和装配生产线上应用RFID技术的案例.该生产线将RFID技术应用于零配件配送管理、装配管理、产品质量检测和产品返工返修等各个环节,以实现有效的生产管理和产品质量追溯.分析了系统的应用需求,完整介绍了系统实施方案,包括系统总体部署、软件功能和应用流程以及编码等.通过该系统的应用,该生产线的零部件混批装配问题降为零,零部件信息完全实现了可追溯,单个产品的装配信息和质量信息实现了快速准确的查询,工作效率得到了明显的提升.     

复杂产品计算机辅助装配过程控制与管理系统

针对复杂产品的装配数据管理分散、生产现场的装配数据可视化和实时化程度不高的问题,引入工作流管理技术,构建了一个面向复杂产品的计算机辅助装配过程控制与管理系统,建立了该系统的体系结构、功能结构和运行流程.研究了基于装配物料清单的静态装配数据管理、基于流程的动态装配数据管理、装配工艺报表格式化输出和装配现场实时可视化监控等关键技术.该系统以装配工艺流程为核心,有效地实现了流程化的装配工艺设计、装配车间的计划调度和实时监控、装配数据的实时采集与统计分析,为离散型装配企业提供了一个统一的精细化装配管理解决方案.所开发的系统在航天某工厂得到试运行,初步应用效果良好.     

面向离散型装配的过程和数据集成管理技术

针对目前车间中装配的数据管理与过程管理脱节的现状,在分析了离散型装配企业的装配过程和装配数据特点的基础上,提出一种基于数据-过程互动模型的装配过程和数据集成管理方法,通过在装配数据和现场装配活动间建立动态的映射关系,有效地描述了装配过程和装配数据之间的互动行为.给出了基于数据-过程互动模型的理论结构和数据结构,并将该方法开发的原型系统应用到工厂中,取得了良好的应用效果.     

基于虚拟现实的组合夹具组装系统研究

针对计算机辅助组合夹具设计存在的问题,提出了一个基于虚拟现实的组合夹具组装系统。给出了系统的功能模型和体系结构,研究了组合夹具虚拟装配模型、虚拟环境下组合夹具元件的装配定位等关键技术和解决方案。提出了基于多视图的组合夹具虚拟装配模型,该模型便于信息表达和管理,符合虚拟环境的表达和组织原则,解决了元件重复使用问题。提出了基于模糊评判的几何约束自动识别方法,对待装配件与装配基准件的装配特征进行匹配和优化选择,实现装配操作意图的准确捕捉。应用实例表明,原型系统能够很好地支持组合夹具组装设计。     

复杂产品装配规划系统

为有效支持复杂产品的数字化装配设计,在深入研究装配建模、序列规划、装配评价及工艺图生成等技术的基础上,设计并开发了具有工程应用价值的复杂产品装配规划与仿真系统AeroAssem.介绍了系统的总体结构、采用的关键技术及其应用情况.以蜗轮蜗杆减速器为例.验证了系统的各项功能和应用效果.通过与国内外装配规划系统的对比,分析了系统在矩阵提取、序列规划、工艺图和仿真等方面的优势.     

面向飞机装配的工艺设计与管理系统研究与开发

工艺是连接产品设计与制造的桥梁,是实现产品信息集成与管理的关键。在分析飞机装配特点和工艺管理特点的基础上,提出了面向飞机装配工艺设计和工艺管理的实现策略,阐述面向飞机装配工艺设计与管理系统应具有的基本功能,并对MBOM的生成和管理做了详细的说明,在此基础上为某航空企业开发了一套面向飞机装配工艺设计和工艺管理的应用系统,并取得了较好的使用效果。     

面向多品种小批量产品的柔性装配系统研究

针对制造企业多品种小批量产品生产对敏捷性的要求,提出了一种柔性装配系统的设计方法,该柔性装配系统能够根据装配现场实时信息动态调整任务并通过控制系统控制现场实施。结合某企业实际情况实现了柔性装配过程的动态管理;利用Plant Simulation对该柔性装配系统进行了仿真研究,验证了该方案的可行性和有效性,为多品种小批量产品柔性装配的研究提供了有价值的参考。     

浅谈飞机部件数字化总装配系统

本文阐述了飞机部件数字化总装配系统的基本功能和构成,分析了部件数字化总装配系统中数字化定位、自动化制孔、数字化测量以及信息集成管理等四大关键技术,提出了国内发展应用部件数字化总装配系统的注意事项。     

基于SolidWorks多排钻机床主轴箱的虚拟装配系统

为提高多排钻机床主轴箱的设计开发效率,论文在SolidWorks环境下,研究了主轴葙的设计流程、SolidWorks的二次开发技术、自动装配技术,开发了基于装配基准特征的多排钻机床主轴箱设计与装配系统,并在企业获得了成功应用.     

飞机附件数字化校准系统的开发与应用

为提高飞机附件安装的自动化和数字化水平,基于刚体运动学及广义坐标理论,构建了一种面向某型飞机附件校准系统的软件框架。该框架采用C/S多层架构体系,从装配关系表达、工艺流程管理、数据组织、计算框架和统计分析方法等方面,阐述了该系统的主要功能、子系统组成和若干关键技术。详细介绍了工艺管理系统和测量系统的工作模式及实现方法,包括数据存储和交换方法、激光跟踪仪的访问与控制技术等。应用实例表明,该系统能满足附件安装过程中各应用层次的自动化及数据管理需求,并为进一步优化装配流程、提高装配精度和效率提供数据基础。     

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...     

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.     

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.     

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。     

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.     

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...