车牌自动生产线网络控制系统设计

基于目前国内车牌半成品大多采用手工生产或单工位自动化生产的现状,设计出一种基于Profibus现场总线的车牌半成品自动生产线网络控制系统。此控制系统在国内首次实现了车牌半成品的全自动化生产,从根本上提高了生产效率与生产质量。在企业生产中成功应用验证了此控制系统具有很高的实用和推广价值。     

传输机械手在汽车座椅滑轨冲压线中的应用与研究

传输机械手在大型多工位生产线中至关重要。主要研究了汽车座椅滑轨冲压生产线中传输机械手的运动与电气控制,重点介绍了S7-300 PLC与安川伺服控制器的通讯连接以及相关硬件与软件的设计。传输机械手的应用,不但实现了滑轨冲压生产线的全自动化而且大幅度提高了生产节奏,变得更加柔性更加智能化。     

车牌自动生产线网络控制系统设计

基于目前国内车牌半成品大多采用手工生产或单工位自动化生产的现状,设计出一种基于Profibus现场总线的车牌半成品自动生产线网络控制系统.此控制系统在国内首次实现了车牌半成品的全自动化生产,从根本上提高了生产效率与生产质量.在企业生产中成功应用验证了此控制系统具有很高的实用和推广价值.     

基于虚拟仪器的PHS自动测试系统设计

设计并实现了基于虚拟仪器的PHS手机自动化测试系统;该系统采用基于PXI总线的在线测试技术、基于Web Service的分布式测试技术、基于Visual Studio.Net的集成化测试技术、基于统计过程控制和数据挖掘的智能化测试技术,完成了PHS手机生产线上的关键测试工位和测试项目的自动化测试,实现了与生产管理系统的企业应用集成和远程维护功能,提出了基于虚拟仪器的自动化测试方案,给出了自动化测试系统功能模块和进一步扩展的系统框架,满足了PHS手机大规模量产的需要.     

纺织布料自动搬运系统设计

针对纺织行业生产线各工位之间设备衔接仍处于半人工半自动化的现状，设计了一种面向纺织布料的自动化搬运系统。该设备使用PLC作为控制器，通过工业网络连接HMI组态设备、电磁阀通信模块的数据交换，对电机、真空组件、气缸的动作进行控制，完成对纺织布料的抓取、送料、放料等工作，可用于纺织机械工序之间的自动化衔接，为纺织行业的自动化发展提供可靠助力。     

PLC在油泵支架产品检测中的应用

本介绍了哈飞Hafei、福特Ford、赛欧Sail等油泵支架自动化生产线产品检测工位5的基本结构，着重叙述了由日本松正（National)可编程逻辑控制器与各种仪器组成的控制和测试系统，并给出了设计实例。     

基于EVM的玻璃缺陷实时检测系统的软件设计

为实现玻璃原片的实时自动化检测,给浮法玻璃生产线上的优化切割系统和玻璃等级打标装置提供详实的数据,设计了一种基于SEED-Davinci_EVM开发板的玻璃缺陷实时检测系统,合理地分配和使用了ARM与DSP来完成各种功能,并采用基于图像灰度的识别算法设计了玻璃缺陷检测软件系统,实现了缺陷的实时自动化检测;实验结果表明,采用基于达芬奇技术的双核处理器有利于实时处理大量的图像数据,能满足自动化系统的检测要求.     

基于组态软件的混凝土预制板生产线监控系统设计

针对混凝土预制板生产线集中监控问题,设计了一套基于计算机组态软件和工业以太网的集中监控系统。分析了混凝土预制板生产工艺流程,研究了生产线的工位布局;采用计算机集中管理, PLC分散控制的方式构建了系统硬件架构;利用力控ForceControl组态软件进行开发,设计了多人机交互界面,并论述了采取的控制策略以及脚本程序的实现。经实践验证,系统运行稳定、灵活性好、实用性强,满足用户对生产线集中管理、监视及自动控制的需求。     

一种基于计算机仿真的自动化生产线改进方法

随着"中国制造2025"战略的提出与实施,工业自动化生产线在其中发挥着至关的作用。目前,许多自动化生产线都存在生产效率低下、设备利用率低、生产物流堵塞等问题,严重制约企业的生产效益。笔者提出了一种基于计算机仿真技术的自动化生产线改进方法,既能用于设计新的生产线,也能用于改造现有的生产线。     

基于S7-400PLC的镀膜玻璃生产线控制系统

针对镀膜工程玻璃生产线工艺复杂,结构庞大,控制参数众多,镀膜过程控制要求响应快、精度高的特点,设计了以西门子S7-400PLC为核心的生产过程控制系统,结合系统结构与硬件配置方案;详细阐述了真空泵、磁控溅射靶阴极电源和玻璃传送伺服电机等子系统的控制策略和特点.给出玻璃长度计算方法和公式,以及位置控制程序流程框图,该系统采用2块独立工作的CPU模块,细化控制任务,提高了编程的灵活性和系统的可靠性.在WinCC组态软件平台上,设计了系统监控软件,上位机处理大量生产过程数据,归档重要参数,实现镀膜玻璃生产过程实时监控.控制系统在现场的成功应用表明,该系统结构合理,功能完善,控制效果好,满足了工程玻璃真空镀膜生产过程自动化的各项要求.     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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