Pearl at the age of five: Case study of development and application of a common high order realtime programming language

The Programming language PEARL for industrial process automation has been developed since 1969. After extensive studies its final definition was frozen in 1976. Since then considerable experience has been gained with some 25 implementations and 200 applications.With PEARL at the age of three, these experiences are offered as a case study in this paper.The paper starts with a characterization of PEARL by indicating the requirements for such a tool, by classifying it with respect to other language types and by pleading for embedded realtime features. As PEARL has been submitted to ISO for international standardization, the question of how it meets the requirements set up by ISO is more thoroughly answered in Appendix A.The report of experience is given separately for implementation, application, and standardization with as much quantitative results as possible, including compiler behaviour, application areas, and economical benefit.For readers not yet familiar with PEARL a tutorial introduction by means of a simple but completely programmed control problem is given in Appendix B.     

面向并行工程的DFA理论与实践

在产品的生产过程中,大约有1/3左右的人力在从事有关产品装配的活动。G.Hird等人指出,在工业化国家中,超过40％以上的生产费用用于产品的装配。因此,降低装配费用,历来是企业界人士和专家们关注的焦点之一。 产品的可装配设计(DFA-Design for Assembly)正是为了降低装配费用而成长起来的高新技术之一。本丈论述了DFA的基本概念、产生背景、发展方向及实现策略。     

A computerized diary facility

According to the level of privacy required, an individual may maintain three types of diary; a wall/calendar chart open to viewing by anyone, a desk-kept diary accessed by a selected group of individuals and the pocket diary accessed solely by the user. All three types may be used in an office environment. A diary facility represents a typical function that could be made available on a communications system. The availability of a diary facility in an electronic office environment is examined in terms of the social factors to be considered, the syntax required for its introduction and the system details needed for support.     

综合粉配料自动控制系统设计及应用

配料站原来通过现场操作人员按照配比,人工调节给料机的给料量。其缺点是给料量的大小完全靠操作人员的经验来决定,配比精度较差,工作人员劳动强度大,自动化水平极低。该文设计了自动配料控制系统,介绍了配料控制系统的结构、工作原理。开发了PID配料控制算法。现场运行表明,该系统运行稳定,自动化程度高,维护方便,解决了原系统配料精度差的问题,提高了产品质量。该系统的成功应用,对同行业的生产进步将起到示范和推动作用。     

低压电器智能测试技术研究

介绍了国内外低压电器测试技术的发展情况,以及＂低压断路器智能测试系统＂和＂NT低压熔断器流水线＂中的新技术,从而对低压电器的智能测试技术做一些探索,最后对被测对象变形轨迹的不确定性提出了模糊控制和遗传神经网络组合控制的方法,应用广泛,效果显著。     

配电自动化主站系统建设方案分析

结合某城市智能电网配电自动化试点建设,介绍配电自动化主站系统的建设原则和可实现的功能,提出软硬件平台的具体设计和配置,以及使用信息交换总线技术实现配电自动化系统与相关系统交互的方案,并对建设方案的可行性进行了分析。     

河北省南部电网重点实验室 电力变压器状态评估技术实验室

简要介绍变电站的发展历程,重点分析智能变电站关键技术的研究方向,指出智能变电站建设的重点工作,提出编制智能变电站建设规划时应考虑的问题。     

计算机监控系统的在变电站集控中心应用

主要以集控中心RCS-9001计算机监控系统应用过程中发现的问题为例进行分析,从变电运行专业角度研究讨论计算机监控系统中三遥信息和后台画面规范的建议,并介绍集控中心特点,阐述集控中心后台集控系统在后台机画面和一、二次设备等在遥控、遥信、遥测等方面应具备的信息量以及今后发展过程中需要解决及规范的一些问题。     

基于PLC的微型CT自动扫描系统

为了实现微型CT扫描成像的自动化,提高生物实验的效率,采用了X射线扫描技术作为成像方法,以射线源和探测器建立透视成像系统,机械控制系统则采用四轴数控机构,主要由载物台位置调整机构、纵向进给滑台和主运动装置组成,使用以可编程控制器为控制核心、以伺服电机为执行机构的数控系统,并以计算机为上位机,协调控制透视成像系统与机械系统的动作,实现了微型CT扫描成像的自动化。将本系统应用于生物实验的结果表明,该系统能大大提高生物实验的效率和质量。