基于Petri网的PLC程序设计

随着生产过程复杂性的增加,对系统的控制也更加复杂。传统的PLC程序设计方法,已不适用于诸如协调、竞争等控制的设计,需要寻求新的程序设计方法来满足复杂的控制要求。介绍了基于Petri网的PLC程序设计。     

新颖的开关电器自动检测生产线

介绍了电器产品自动检验生产线的先进技术与特点,叙述了塑壳式断路器、万能式断路器在线自动检测的顺序及工序内容,为企业选用自动检测生产线提供选择.     

变电站保护装置状态监测的优化和异常处置

随着变电站二次系统的不断发展,对于二次设备状态,特别是继电保护装置状态的监测越发重要.基于采集保护装置自身各类信号形成的站端和主站状态监测系统已经全面推广,但由于监测规模和信号数量的不断膨胀,对保护装置的状态监测呈现复杂化、无序化的趋势,运维人员也难以高效排查处置保护装置异常.文中首先多角度分析了现有站端保护装置监测系...     

敏感用户工业过程的过程免疫时间曲线刻画方法

过程免疫时间曲线是分析敏感用户工业过程对电压暂降免疫力的重要工具。针对实际生产中过程参数监测困难、用户监测意愿低导致过程免疫时间曲线难以刻画的问题,文中提出监测数据缺失或不足时典型工业过程的过程免疫时间曲线模型构建方法。首先,基于典型工业过程结构,利用敏感设备电压暂降免疫时间常数计算过程免疫时间;然后,由经验公式和二次Lagrange插值分别得到无监测数据和少量监测数据情况下过程免疫时间曲线;最后,通过对某天然气压气站大功率电驱离心式压缩机系统的分析,验证了所提方法的可行性与有效性。     

Simulation and analysis of induction machines with rotor asymmetries

The need for detection of rotor faults at an earlier stage, so that maintenance can be planned ahead, has pushed the development of monitoring methods with increasing sensitivity and noise immunity. An important issue in such an effort is the modeling of the induction machine including rotor bar and end-ring faults, with a minimum of computational complexity. A new and simpler method is employed in the simulation and analysis of an induction motor with rotor asymmetries. Simulation, finite-element analysis, and experimental results are presented to support the proposed approach.     

生产实时监管系统的设计与实现

根据发电企业生产管理特点,设计了一套完整的生产实时监管系统。系统集成了生产过程实时监控、运行重要事件自动监视和报警、性能计算与经济分析、重要指标在线对比分析、综合报表等功能模块,实现发电企业各部门、电厂之间生产数据的传输和共享。使相关人员可以快速、准确地掌握各电厂生产运行状况,提高发电企业的信息化水平和管理水平。     

IFIX在卷烟厂自动化生产物流监控系统中的应用

介绍了iFIX工控组态软件在卷烟厂的自动化生产物流监控系统中的应用。详细论述了生产物流监控系统的结构、组态过程、软硬件配置及软件设计等。可见iFIX在大型复杂生产物流分布式控制系统中的应用是可行的,保障了生产过程的连续运行,同时降低了生产制造成本。     

综合电力监控仪表的设计

针对目前广泛采用的A/D MCU测量电网参数的电力监控仪表开发周期长、软件复杂的缺点,本文阐述了一种基于ATT7022A芯片的综合电力监控仪表的实现方案,并给出了电能测量原理、详细的电路组成和软件流程图.该系统可以完成各种电力参数及时、准确的检测和报警,同时具有灵活的远程软件校表功能.     

电动汽车换电智能监控系统的改进

分析了电动汽车换电监控系统的现状与存在的问题。结合实际换电运行流程,设计了一种改进的电动汽车换电智能监控系统。该监控系统设计了新型的换电电量计量方法,解决了换电电量计量与计费困难的问题。设计了电池箱优选策略,实现了全自动换电命令下发、换电过程管理、换电决策和换电执行过程全景反演等的应用,解决了换电监控系统智能化程度不足的问题。设计了换电监控系统的系统组成、架构设计、功能定义和新型换电流程,并从软件设计、组网实现、数据结构、换电电量计量与计费、全自动换电策略等方面的工作完成了系统的最终实现。实际工程应用结果表明,该系统可显著降低换电电量计量与计费功能的实现复杂度和成本,提高电动汽车换电监控系统的智能化水平,降低换电站建设和运营成本。     

Fuzzy decision support for the control of detergent production

This paper describes a fuzzy decision support system (DSS) for the control of a detergent production process. The application has been carried out at a real‐world, large‐scale industrial production plant in the Netherlands, where a large variety of powder‐based detergents for industrial users are produced in a spray drying process. The system consists of several fuzzy rule bases that model the control actions of experienced process operators in response to different quality deviations of the product. A hierarchical architecture of the fuzzy system is introduced to cope with the complexity. A fuzzy supervisor is used to deal with process constraints and to activate the applicable rule bases when control actions are needed. In this way, a system is obtained that enables the control of the process within stricter quality bounds than those applied by human operators alone. During in‐production evaluation, the average improvement in the quality parameters for all product classes was above 30 percent. Copyright © 2001 John Wiley & Sons, Ltd.     

Online condition monitoring of induction motors

Condition monitoring of induction motors is a process that may be used to great advantage in mining and other industrial applications. The early detection of motor winding deterioration prior to a complete failure provides an opportunity for maintenance to be performed on a scheduled routine without the loss of production time. Presented in this paper is a theoretical and experimental analysis of a voltage mismatch technique that may be used in operating situations to monitor the health of induction motor windings. It extends previous work in this area by demonstrating the robust nature of the monitoring process not only under conditions of power supply unbalance but also in situations where motor construction imperfections exist and mechanical loads are unpredictable. A suggested procedure for application of this condition monitoring process in industrial situations is also included.     

连续碳酸化分解过程实时监控系统

由于现场工艺复杂，容易发生突发性事故，故安全生产是连续碳酸化分解过程的基础。本文结合连续碳酸化分解过程的机理特征和经验知识，开发了连续碳酸化分解过程实时监控专家系统。首先将碳酸化分解过程的机理特征和经验知识进行分类，然后采用面向对象的产生式规则表示知识，设计了基于规则的监控知识库，最后描述了基于前向搜索的监控推理机。实际运行表明，该系统提高了整个生产流程运行的安全性，减少了安全事故的发生。     

基于ZigBee的温湿度监测系统

周围环境的温湿度信息对于生产和生活都存在重要的影响,本文针对现有的温湿度监测系统布设线缆的复杂和高成本,结合无线传感器网络技术,提出了一种新的基于ZigBee技术的温湿度监测系统实现的方案。本方案利用网络覆盖容量大的簇状网络组网,在ZigBee协议栈的基础上进行应用开发,硬件使用JN5139模块,给出了系统实现的软件流程图及相关程序代码,最后在超级终端实现了温湿度的实时监测,结果表明,ZigBee技术以其低功耗、低成本、网络容量大的特点,在实现实时温湿度监测方面有很大的优势。     

基于混合队列模型的配电网状态监测业务通信带宽预测

配电网状态监测系统建设是构建泛在电力物联网的重要内容,准确预测通信网络带宽对明确业务需求、优化资源配置具有重要意义。针对当前配用电基于排队论的通信带宽预测方法在混合业务并存时带宽计算过程复杂的局限性,提出了一种基于G/M/1/N队列模型的通信带宽预测方法。从状态监测系统架构和数据业务特点出发,分析混合数据业务到达时间间隔的统计描述以及基本传输速率,并给出了满足服务质量（quality of service,QoS)要求的系统带宽最优化化求解方法。以典型配电网状态监测应用为例,讨论了业务带宽、服务质量和带宽利用率之间的量化评价过程;验证了配电网状态监测网络信息流的“小数据”特征,为低功耗广域物联网通信技术在配电网状态监测中的应用提供了理论支撑。     

Dependence of process parameters on stress generation in aluminum thin films

The dependence of residual stress on the process parameters for aluminum metallization has been studied using a rotating beam sensor. This shows increasing tensile stress with both the target power and ambient pressure used during the sputter deposition of the aluminum layer. The bulk resistivity of the deposited aluminum has been measured using a Van der Pauw technique on test structures fabricated alongside the sensors and this shows different trends with respect to the target power and ambient pressure. This indicates that the stress in an interconnect feature is dominated by extrinsic components, which result from the mismatch in thermal expansion coefficient between the constituent layers, rather than the defects formed during the sputter deposition of the metallization. This indicates the suitability of the stress sensor technique to the monitoring of interconnect features in a production line environment.     

变电站图像监控集中监控系统的研究

变电站图像监控系统在发展过程中,普遍出现了在同一辖区内设备多厂家、多界面等情况,难以进行有效的生产监控管理。介绍了洛阳供电公司变电站图像监控集中监控系统的构成及其功能,该系统的成功运行证明其能有效地规范变电站图像监控管理。     

TFT-LCD液晶基板玻璃生产过程中的在线式称重方式初步研究

介绍了TFT-LCD液晶基板玻璃生产过程中的离线式称重和在线式称重的用途和区别,及在线式称重方式中的三种不同的称重方式,通过对比硬件配置、分析动作流程和调试维护难度等方面,寻找三种称重方式的优缺点、差异,在实施过程中的难易程度和复杂性,以及适用于不同的工艺要求,根据不同的应用情况,选择符合产线要求的称重方式。     

基于贝叶斯迭代的非侵入式负荷事件检测方法

无监督型的非侵入式负荷监测技术是负荷监测领域的发展趋势,而负荷事件检测是其中的重要环节.目前的负荷事件检测方法存在超参数复杂不易调整的问题,且对不同类型的负荷事件自适应能力差.为此,提出一种基于贝叶斯迭代的负荷事件检测方法.该方法构建了事件检测模型,基于贝叶斯迭代对模型进行求解,最后结合负荷监测的应用实际优化求解速度....     

电网调控机器人设计思路

随着中国电网规模持续扩大和运行特性日趋复杂,电网调控业务复杂度及调控人员承载力强度日益增加。文中从电网实时调控业务出发,设计了电网调控机器人整体架构,详细阐述了智能学习、智能决策、智能监视、智能执行、智能交互等5个功能模块的设计思路;然后介绍了相应的关键技术,并给出了适用的6类调控应用场景。     

An overview of fault monitoring and diagnosis in mining equipment

Proper detection and diagnosis of failing system components is crucial to efficient mining operations. However, the harsh mining environment offers special challenges to these types of actions. The atmosphere is damp, dirty, and potentially explosive, and equipment is located in confined areas far from shop facilities. These conditions, coupled with the increasing cost of downtime and complexity of mining equipment, have forced researchers and operators to investigate alternatives for improving equipment maintainability. This paper surveys monitoring and diagnosis technologies that offer opportunities for improving equipment availability in mining. Expert systems, model-based approaches, and neural nets are each discussed in the context of fault detection and diagnosis. The paper concludes with a comparative discussion summarizing the advantages and disadvantages of each