A web and mobile device architecture for mobile e-maintenance

The paper presents the development of a mobile maintenance support system based on web and mobile device technologies, i.e., personal digital assistant. The architecture relies on a shop floor system and a supporting system in a diagnostic center. The shop floor system is supported by a mobile device, which helps the maintenance engineer to perform maintenance tasks. This gives great support to the maintenance engineer as it facilitates the access to decision-making support, work order, and spare part handling modules etc. that are available in the device. The diagnostic center provides the maintenance engineer with decision support for his various tasks, when needed. Moreover, a database table listener agent, located at the database server, was developed to keep track of the maintenance engineer’s work orders at a certain priority level. The proposed approach can reduce the maintenance costs and solve the problem of the unavailability of an expert. More efficient maintenance is believed to be achieved through the use of web and agent technologies since data, maintenance systems, and processing can be gathered and integrated and data can be acquired from additional sources when necessary. The proposed system, the web, and embedded technologies as well as remote communication were tested successfully.     

蓄电池气密性检测设备故障诊断专家系统

本文通过对蓄电池气密性检测系统故障特点的研究,采用故障树分析法以及反向推理策略,构建了蓄电池气密性检测设备的故障诊断专家系统,利用各种输入信息,实现故障推理,最终确定故障源,给出故障维修建议及结果说明.本文对该故障诊断专家系统的推理机制和搜索策略也作了详细介绍。     

无人机飞控系统故障诊断专家系统设计

针对无人机飞控系统的特点和维护要求,介绍了MBIT故障诊断专家系统的设计思路和实现方法,构建了无人机飞控系统故障诊断专家系统的体系结构,深入研究了如何建立故障知识库、制定推理机制、组建综合数据库和故障解释,并结合某型号给出了具体的示例。在工程实际使用过程中,可以利用本系统对无人机飞控系统进行有效维护。     

DCS系统接地的探讨

DCS系统的可靠接地是保证化工厂DCS安全和可靠运行的首要条件。根据一些化工厂的系统设计和现场经验,对DCS系统的接地进行了探讨,提出了直流工作地悬空的处理方法。     

虚拟企业中零件信息在线访问系统

定义了一个能够支持企业不同部门以及不同企业共享数据与服务的零件信息在线访问系统的体系结构,介绍了组成该系统的数据维护、公布、搜索、展示、用户管理、管理构件,描述了根据零件功能的分类方法和零件类型的数据模型和用户方案、供应商方案。     

基于神经网络与故障树的电气设备故障诊断系统

为提高工程车辆电气设备的维护保养能力,构建了其电气系统的故障诊断专家系统。进行了该装备各个组成系统的故障模式与故障元件分析,研究了故障树的建树步骤与故障树的模型分析与建立,设计了基于神经网络推理技术的专家系统正向推理机制。研究成果在部队中的应用表明,该方法有效地提高了部队的装备故障维护与保障能力。     

一种牛卡纸机的集散控制系统

在分析板纸机控制难点的基础上，提出了一套新的以Siemens S7-300PLC为核心的集散控制系统。该系统包括绝干浆量控制、扫描架控制、定量水分（B／M）控制和3段供气等子系统，采用了自整定PID／PI控制、比值控制和前馈解耦控制等多种过程控制算法。系统在山东某公司的牛卡纸机上投运成功，经济效益明显。     

集散控制系统的最新技术特点与展望

集散控制系统(DCS)因其具有控制和危险分散、管理和显示集中的显著特点仍被作为当今工业过程控制领域的主要控制系统之一.该文在对DCS的基本体系结构和技术特点进行必要阐述的基础上,描述了DCS的发展现状,介绍了最新DCS的技术特点,列举了和FCS比较DCS存在的问题,最后对DCS的发展作出了包括和FCS结合,打造更加完善的综合系统;出现更多满足中小用户需求的中小型DCS;具有无线通信功能;智能控制、智能诊断等四方面的展望.     

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.     

集散控制系统及其在尿素生产过程中的应用

介绍了SUPCON JX－300DCS 系统的特点及系统的组态，给出了系统在尿素生产过程中的应用，包括水溶液全循环尿素工艺，DCS控制方案设计。     

渭化尿素装置控制系统改造

渭河煤化工主装置控制系统是1995年调试并投入运行的,控制部分采用日本横河公司的CENTUM-XL系统,联锁控制部分采用日本安川的U84 PLC系统,10多年来,这些系统运行平稳。但近几年DCS的故障率在不断升高,卡件更换增加。由于该系统已经超过设计使用寿命,考虑到维护成本以及维护难度,在2009年4月对DCS和PLC进行了升级或改造。该文介绍尿素控制系统的组成,控制系统的改造方案、系统配置以及实施情况。     

工程车辆的远程分布式智能监测、诊断、维护系统研究

特种工程车辆由于其结构复杂，使用中分布广泛，其故障诊断与维护工作难度很大，针对这种情况，对特种工程车辆的远程分布式智能监测，诊断，维护技术进行了研究，结果表明该系统的应用可充分发挥主机厂，各地维护中心的技术优势，为分布在各地的工程车辆提供及时，有效，全面的诊断，维护服务，充分发挥出乘员的主动性和车辆的最佳效能。     

基于Internet的FMS远程监测与故障诊断技术研究

目的 :提高 FMS设备故障诊断和排除的速度 ,加快维修需求的响应能力以及降低停机维修的费用 ,提高全球规范服务能力。方法 :将 FMS设备和监测计算机与 Internet相连 ,利用 L ab VIEW进行数据传输和分析 ,用 VRML 虚拟现实技术进行图象传输。结果 :提出了基于 Internet的 FMS远程故障诊断系统的总体框架及具体的信号采集和传输方法 ,建立了远程故障诊断专家系统。结论 :基于长春 5 5所 FMS设备的实验仿真证明了该总体框架和方法能够实现远程数据和图象传输 ,可以实现对异地设备进行监测和诊断     

Support vector machine in machine condition monitoring and fault diagnosis

Recently, the issue of machine condition monitoring and fault diagnosis as a part of maintenance system became global due to the potential advantages to be gained from reduced maintenance costs, improved productivity and increased machine availability. This paper presents a survey of machine condition monitoring and fault diagnosis using support vector machine (SVM). It attempts to summarize and review the recent research and developments of SVM in machine condition monitoring and diagnosis. Numerous methods have been developed based on intelligent systems such as artificial neural network, fuzzy expert system, condition-based reasoning, random forest, etc. However, the use of SVM for machine condition monitoring and fault diagnosis is still rare. SVM has excellent performance in generalization so it can produce high accuracy in classification for machine condition monitoring and diagnosis. Until 2006, the use of SVM in machine condition monitoring and fault diagnosis is tending to develop towards expertise orientation and problem-oriented domain. Finally, the ability to continually change and obtain a novel idea for machine condition monitoring and fault diagnosis using SVM will be future works.     

核电厂DCS系统相关的人因陷阱识别与优化措施

本文以田湾核电厂5号机组调试过程为依据,从人机接口设计方面分析调试期间数字化仪控系统(DCS)存在的典型人因失误陷阱,其中包括现场控制站间通讯信号检索问题、DCS系统信号传递问题、现场控制站工程版本问题、工艺系统流程图画面问题,并提出相应的优化措施。经过整个调试过程的跟踪验证,这些优化措施在避免此类人因陷阱方面起到了很好的效果,可供其他核电厂DCS系统调试参考。     

核电站非安全级DCS网络和主机信息安全防护

随着工业4.0的浪潮滚滚而来,核电站控制系统已经普遍改造为SCADA、DCS等数字化控制系统。工业以太网、工业现场总线,以及大量标准互联网技术已经被应用于核电站控制系统。本文将聚焦于网络安全和主机安全,探讨核电站非安全级DCS的信息安全防护。DCS网络安全防护将主要涉及3个方面,包括区域划分、边界防护和网络入侵防护。DCS主机安全防护将主要涉及集中管理,用于给出一种核电站非安全级DCS的信息安全防护方案,着重通过网络安全防护措施和主机安全防护措施,有效提高核电站非安全级DCS的信息安全防护能力。     

铝型材生产过程质量控制系统的研究

从模具智能CAD、生产过程在线检测、缺陷诊断专家系统三个方面论述了铝型材生产过程中质量控制系统的构成，介绍了各子系统结构及功能。系统具有数据一致性。冗余少、易维护等特点，在实际应用中取得了成功。     

Research and Development of Electro-hydraulic Control Valves Oriented to Industry 4.0: A Review

Electro-hydraulic control valves are key hydraulic components for industrial applications and aerospace, which controls electro-hydraulic motion. With the development of automation, digital technology, and communication technology, electro-hydraulic control valves are becoming more digital, integrated, and intelligent in order to meet the requirements of Industry 4.0. This paper reviews the state of the art development for electro-hydraulic control valves and their related technologies. This review paper considers three aspects of state acquisition through sensors or indirect acquisition technologies, control strategies along with digital controllers and novel valves, and online maintenance through data interaction and fault diagnosis. The main features and development trends of electro-hydraulic control valves oriented to Industry 4.0 are discussed.     

Digital monitoring and health diagnosis for mechanical equipment operation safety based on fiber Bragg grating sensor

This paper introduces fiber Bragg grating (FBG) based on a fiber optic grating sensor developed to be embedded on mechanical equipment for digital monitoring and health diagnosis. The theoretical and experimental researches on the new-style FBG sensor (FBGS) technology, high-speed demodulation, and data transmission are discussed. The transmission characteristics between the FBG and the detection interface, modeling and compensation method for online distributed multi-parameter digital monitoring and methods for data processing, synchronous sampling, and long-term dynamic digital monitoring using embedded technology are also presented. The acquired information by an FBGS can be used for the optimization of maintenance schedules and refinement of mechanical equipment design. It is a challenge to gather real-time data from components working at high speed and in a severe environment of high temperature, high pressure, and high rotation speed. Currently, there are no sensors or technologies available for digital monitoring and health diagnosis under this rigorous situation for use in mechanical engineering operation safety. As a result, this paper introduces an online distributed and integrated digital monitoring system and health diagnosis. The new principle and new method will contribute to modern measurements in science and technology, mechanical engineering, and large mechanical equipment operation safety.     

一种基于设备结构的振动故障诊断专家系统

根据设备种类的多样性及振动故障诊断专家系统诊断对象范围窄的特点,研究了基于设备组成结构的多征兆模糊产生式规则的诊断知识表示,和以关系数据库为基础的知识库建立与维护机制,通过ADO技术实现对知识库的访问和推理,并开发基于设备结构的振动故障诊断专家系统.应用表明,系统具有构造简单,推理效率高等优点,有效地提高了机械设备故障诊断专家系统的适应性和通用性.