Study on manufacturing grid resource service QoS modeling and evaluation

Current research on manufacturing grid (MGrid) systems has mainly concentrated on its concept, architecture, application prototype platform, and application foreground. Absent from the trend is the quality of service (QoS) of MGrid, such as QoS modeling, QoS evaluation, and QoS-based scheduling, which play a very important role in MGrid resource management. The related topics about MGrid and QoS are investigated in this study. The characteristics of QoS associated with its management requirements in MGrid are then further studied. Classification and modeling of MGrid QoS are investigated from three different perspectives: QoS whole-lifecycle management, MGrid architecture view, and QoS attribute parameters. The measurement and evaluation models of QoS parameters in MGrid are presented. A simple case study is described to illustrate how the proposed works can be applied to MGrid resource service management.     

制造网格中基于服务的工作流研究

为了实现制造网格平台中业务流程的构建、执行和管理监控，分析了制造网格环境下工作流的特点，在传统的工作流框架上进行扩充，提出了制造网格工作流框架和基于服务的抽象工作流模型。根据工作流查找和绑定服务的时机，将工作流分为服务模型建立、服务发现、服务绑定和服务调用4个阶段。根据工作流抽象模型中活动说明的服务质量需求和服务描述中的服务质量（QoS）属性，选用不同的服务发现策略，使同一个活动的不同实例能够绑定不同的服务，提高了制造网格工作流的柔性和自适应性。结合一个实例予以了验证。     

基于CORBA的网络机器人A/V流式服务的设计和实现

在基于CORBA开发的分布式网络化机器人的控制平台中，传统的基于请求／应答模式不能满足对服务质量要求严格的多媒体数据流实时传输。针对系统的应用框架，本文提出了采用工厂模式对OMG的CORBA A／V流式服务模型进行简化，实现分布式网络化机器人的实时音视频传输。实验表明了这个方案的先进性和有效性。     

基于深度学习算法的调度自动化云平台任务优化策略研究

分析了云平台任务调度的特点和目标,从任务调度算法入手,提出了基于改进粒子群算法的电力调度自动化系统的人工智能方法,开发了云计算操作的模型。基于该算法和物理模型的运行控制考虑了 QoS 要求和平台云居民的环境负载平衡,可以有效提高所提电力调度自动化系统的云平台任务调度的效率。以电力自动化云平台为分析对象,研究其架构,将修正的 PSO 算法与云资源调度模型的结构拓扑相结合,建立三级数据节点,给出了基于改进 PSO 的云平台调度模型,旨在提高云计算资源配置效率,改善云服务质量,解决电力调度自动化系统的任务调度问题。     

分布式监测系统应用服务器设计

在分析分布式实时监测系统结构及实时数据处理的基础上，提出一种通用实时监测应用服务器设计方案。本应用服务器采有多线程机制，在线采集工业控制的实时数据，通过浏览器可视化组件动态发布设备运转及生产状况信息。本方案具有完善的页面请求、客户请求、以及数据对象的管理和服务功能，其结构灵活，系统维护性强。     

面向服务质量的交互式Web服务选择

在大量相似服务共存竞争环境下,为了实现面向服务质量的Web服务选择,分析了Web服务质量综合、模糊、动态和可配置特征,指出了当前服务描述和查找标准在服务质量信息描述和应用方面的不足。提出了Web服务的服务质量语义描述模型;设计了基于综合模糊评价系统的柔性可配置Web服务的服务质量需求语义描述模型;提出了改进的服务描述、查找和集成过程,利用基于合同网的交互协议规范的服务提供方、中介服务和服务用户3方协作,实现了面向服务质量的交互式Web服务选择。     

高速柔性平面3-RRR并联机器人实验系统开发

以"IPC PMAC"为控制核心、"RTLinux"为开发平台建立了高速柔性平面3-RRR并联机器人的实验系统,实现了包括机器人回零限位、轨迹规划与控制、系统状态监测等主要功能.通过实验与仿真结果对比验证,该系统具有稳定性高、开放性好、实时性强等特点,可满足高速、高加速、大柔性平面3-RRR并联机器人的实验要求.     

Quality of service in manufacturing networks: a service framework and its implementation

Due to the continuous growth in the application of networks in manufacturing, quality of service (QoS) has become an important issue. In this paper, the concept of QoS for manufacturing networks is discussed. To provide overall performance assurance for manufacturing networks, a service framework integrating the QoS mechanisms of the networked resource service management function and the communication networks is proposed. The novel framework maps an application to resource services and then to communication networks, adopts an intelligent optimisation algorithm for QoS management of resource services, and provides QoS schemes for data transfer across communication networks. A prototype implementation has been realised and a set of simulation experiments conducted to evaluate the validity of the framework. The results obtained demonstrate the ability of the framework to satisfy the various performance requirements posed by such applications and provide efficient overall performance assurance for manufacturing networks.     

多轴控制功能的液压伺服系统的开发和应用研究

针对现代工业生产过程中日益苛刻的控制要求,开发了一种基于柔性控制器架构的液压伺服系统.采用现场总线方式能够处理复杂的多轴功能,实现快速精确的闭环控制,并构筑了开放式软件平台,提供完整的编程、调试、模拟、参数化、可视化和跟踪功能.该系统应用在国内某著名钢铁厂烧结机的布料控制上,实现了对扇形闸门和微调闸门(由7组液压缸联轴驱动)开度的真正的精确闭环控制.自2008年初投产以来的正常运行表明:该系统具有较好的稳定性和可操作性,并由于其信号处理灵活、控制结构柔性的特点而在不同的工程领域有着更为广泛的应用前景.     

Web service dynamic composition based on decomposition of global QoS constraints

Virtual enterprise is a temporary network of independent companies or enterprises that can quickly bring together to fulfill a value-added task. With the development of Web service technologies, the enterprise business systems can be encapsulated as Web services. Establishing a virtual enterprise is actually a process of Web service composition. As more and more Web services with the same functionalities and different Quality of Service (QoS) are available, QoS-aware Web service dynamic composition becomes an active research issue. Although several solutions have been provided for this issue, most of these methods based on global optimization, their poor performance render them inappropriate for applications with dynamic and real-time requirements. Moreover, these methods do not consider the commercial agreements and historical contact information between Web services with combination relationship. In this paper, we propose an approach for Web service dynamic composition based on global QoS constraints decomposition. The proposed method consists of three steps: Firstly, global QoS constraints are decomposed into local constraints optimally by a new algorithm named Culture Genetic Algorithm. Secondly, QoS values determination rules are designed to determine QoS values of candidate services. Thirdly, best Web services that can satisfy the local constraints are selected for each task during the running time. Experimental results show that our approach has better performance in solving the problem of QoS-aware Web service dynamic composition.     

An agent- and service-based collaborative design architecture under a dynamic integration environment

The shortening of product realization times and the increase of product complication require multidisciplinary experts to cooperate dynamically and closely in the whole product development lifecycle, behavior that has been previously unfamiliar. To further improve the design cooperation efficiency under this environment, this paper presents a novel cooperative design architecture using revolutionary Internet, agent, and semantic Web technologies. Based on the concept of service provision, intelligent Web-agent groups act as the function backbone to organize the service-based running of the system. Multidisciplinary product development units can be dynamically formed and configured in a knowledge-integration perspective. The layer-based architecture encapsulates distributed knowledge at a higher abstract level and coordinates lifecycle activities from different domains. Semantic-rich service expression and intelligent service accessing through agent mediation make the system more flexible. Within this dynamic cooperative environment, all of the participants involved and their distributed knowledge can be integrated as a whole to achieve more efficient and more intelligent design cooperation.     

Shopfloor logistics for flexible manufacturing based on distributed intelligence

The general constraints restricting the application of flexible manufacturing are summarised and related to the requirements of factory automation. Such specifications are compared with the combined functional and behavioural characteristics that can be obtained by employing robotics. A new (interconnected-decentralised) control architecture is presented, which has been specifically developed for raising productivity, whilst assuring extended flexibility for the plant operation.     

基于LabVIEW的高能液压马达性能试验测控系统

为了验证新型高能液压马达设计的预期性能,需要测试其在给定工作条件下的技术特性和参数。针对这一要求,设计了一种用于高能液压马达性能试验的测控系统。从液压系统、加载系统以及软硬件系统等方面详细介绍了测控系统的设计过程,重点阐述了基于LabVIEW平台的系统软件架构。同时,该测控系统采用了利用电液比例溢流技术来提高测控系统的静态和动态的加载性能。该测控系统已经投入使用,证明完全可以满足项目试验要求。     

网络化教学管理系统的研究与开发

在分析高校教学管理需求的基础上，提出了网络化教学管理三层体系结构，该体系结构将服务封装与逻辑计算相分离，使得系统具有可拓展性、开放性，能够适应需求变更。同时研究了网络化教学管理系统中的访问控制实现方法，对系统实现中的关键技术进行了研究。     

云制造环境下基于离散Markov跳变系统的机床装备资源动态优选方法

针对云制造环境下加工任务执行过程中机床装备资源易受紧急插单、加工质量异常、设备运行故障等高频随机扰动影响,致使产品加工服务质量(QoS)不能满足客户个性化需求的问题,提出一种基于离散Markov跳变系统的机床装备资源动态优化选择方法.首先,结合云制造服务运行特点,构建了云制造环境下面向加工任务执行过程的服务质量动态演化...     

Design and implementation of an Internet based effective controlling and monitoring system with wireless fieldbus communications technologies for process automation--an experimental study

The network requirements of control systems in industrial applications increase day by day. The Internet based control system and various fieldbus systems have been designed in order to meet these requirements. This paper describes an Internet based control system with wireless fieldbus communication designed for distributed processes. The system was implemented as an experimental setup in a laboratory. In industrial facilities, the process control layer and the distance connection of the distributed control devices in the lowest levels of the industrial production environment are provided with fieldbus networks. In this paper, the Internet based control system that will be able to meet the system requirements with a new-generation communication structure, which is called wired/wireless hybrid system, has been designed on field level and carried out to cover all sectors of distributed automation, from process control, to distributed input/output (I/O). The system has been accomplished by hardware structure with a programmable logic controller (PLC), a communication processor (CP) module, two industrial wireless modules and a distributed I/O module, Motor Protection Package (MPP) and software structure with WinCC flexible program used for the screen of Scada (Supervisory Control And Data Acquisition), SIMATIC MANAGER package program ("STEP7") used for the hardware and network configuration and also for downloading control program to PLC.     

A distributed interconnected control for computer-integrated manufacturing

An innovative control system architecture is considered which preserves the parallelism of the manufacturing operation with the goal of improving productivity through maximal use of resources with varying product mixes. To combine flexibility with efficiency, the expert integrated management (XIM) architecture technology is developed which governs a multiprocess environment with distributed intelligent interfaces and which controls the communication and synchronization tasks for each manufacturing situation. The performance of this distributed interconnected control system is demonstrated with the special purpose expert simulator (XIM-SIFIP), which combines the previously developed simulational facilities (XS-SIFIP, for flexible manufacturing sections and XT-SIFIP, for tool-supplying service) by means of a new information processing device that enables parallel control of the multiagent framework.     

基于质量相似度的Web服务信誉度量

为提高Web服务信誉度量的灵活性和真实性,提出一种基于服务质量公告值和实际值相似度的Web服务信誉度量模型。通过上、下两层本体,描述了Web服务服务质量的语义和层次化的服务质量指标体系。提出一种支持层次化服务质量指标体系的质量相似度算法,并将质量相似度作为信誉度量的依据。信誉度量算法以统计理论为基础,引入遗忘因子和波动因子,并考虑了服务质量的发展趋势和波动情况对服务信誉的影响。实验表明,该模型具有良好的灵活性和实用性。     

离散制造业可适应制造执行系统的研究与实现

制造执行系统作为现代制造车间的管理控制系统,仍然采用缺少柔性和可配置性的架构,导致其难以适应制造环境和制造过程的变化。针对这个问题,详细分析了制造系统对制造执行系统适应性的需求,研究了可定制数据集成适配器、可配置的工厂模型、可复用的业务组件以及脚本驱动的事件响应机制等关键技术,设计了一种新的可适应性制造执行系统框架。该框架能够在尽量小改动的情况下对制造系统内、外部的变化提供支持。给出了基于该框架开发的一个制造执行系统实现,该系统已被成功应用于不同汽车装配线。     

酒店客房机电设备控制系统的应用

酒店客房机电智能化控制实现了居住、办公等场所的多元化控制管理。系统将空调控制功能、室内机电设备、灯光、客房服务等集成到一个控制器上，实现从最基本的机电设备管理到客户特殊要求的功能管理，是一个专门为高级酒店设计的多功能控制管理系统。系统的结构布局包括计算机房的主机、服务器和位于前台、服务部、保安部和工程部的多个终端，通过这些设备实现控制、监控和显示所有客房及工作区域的服务信息。本文介绍了酒店客房机电智能控制管理系统在某酒店的应用。