基于STM32的工业通用控制器的研究与实现

设计的基于嵌入式微处理器、可组态的工业通用控制器支持以控制系统图形化编程为基础的过程控制。在论述控制器硬件整体架构的基础上,详细分析了软件设计中,组态序列解析方法、多任务之间的同步及通信协议状态转换等影响系统实时性和鲁棒性的因素,并提出有效的解决方法。     

包钢薄板厂横切机组自动化系统

文章论述了包钢薄板厂冷轧横切机组基础级自动化系统组成、系统控制功能、系统软件、网络组成及应用程序介绍,并详细分析了滚筒剪的控制原理和性能特点,以及操作画面在实际生产中的应用。     

基于力控组态软件的储油气库监控系统设计

辽宁石油化工大学建设了石油化工产业链实物仿真实践教育基地，以供学生进行认知及操作实习，将理论与实践结合，提高学生现场实际操作能力。但由于一些设备的安装调试尚未完成，某些装置有可以改善的地方。就储油气库实训装置来说，现场检测仪表及监控系统的完成度不高，监测点有限。针对辽宁石油化工大学工程训练中心储油气库实训装置，结合了组态技术，设计了基于力控组态软件并以西门子S7 200 PLC为控制核心的监控系统。     

基于PLC与组态的矿用提升机在线监测系统的开发

矿用提升机的正常运行对煤矿安全生产至关重要.分析提升机系统及其监测现状的基础上,采用PLC与组态软件,开发了矿用提升机在线监测系统.该系统包括:对监测数据进行采集传送的下位机PLC和对监测数据进行显示保存的上位机监测软件,具有良好的可扩充性、可修改性、可移植性、可维护性,性能稳定可靠,操作简单,便于推广,已投入实用,并取得了良好效果.     

A service interruption free testing methodology for IEDs in IEC 61850-based substation automation systems

This paper presents a methodology for the testing of intelligent electronic devices (IEDs) in IEC 61850-based substation automation systems (SAS), without any service interruption to the end users, during the testing process. IEC 61850-based SAS provides opportunities for a new level of substation operation, enhancing operating efficiency, and protection reliability based on Ethernet-based communication networks. Due to these changes to the conventional substations, importance and dependency on IEDs is increasing rapidly. Frequency of faults occurring in the power systems is random in nature and is unpredictable. It is necessary to test and maintain the IEDs to ensure their proper operation at crucial times. This paper presents a novel methodology for testing the IEDs, without compromising the service reliability during the testing process. The proposed methodology exploits the inherit characteristics of IEC 61850 standard i.e. Network - based communication, interchangeability between multivendor IEDs, and engineering based on substation configuration language (SCL) files. The feasibility and robustness of the proposed method has been verified by performing several performance verification tests with different performance metrics.     

Grammar-based generation of stochastic local search heuristics through automatic algorithm configuration tools

Several grammar-based genetic programming algorithms have been proposed in the literature to automatically generate heuristics for hard optimization problems. These approaches specify the algorithmic building blocks and the way in which they can be combined in a grammar; the best heuristic for the problem being tackled is found by an evolutionary algorithm that searches in the algorithm design space defined by the grammar.In this work, we propose a novel representation of the grammar by a sequence of categorical, integer, and real-valued parameters. We then use a tool for automatic algorithm configuration to search for the best algorithm for the problem at hand. Our experimental evaluation on the one-dimensional bin packing problem and the permutation flowshop problem with weighted tardiness objective shows that the proposed approach produces better algorithms than grammatical evolution, a well-established variant of grammar-based genetic programming. The reasons behind such improvement lie both in the representation proposed and in the method used to search the algorithm design space.     

基于DirectUi的工业组态库的设计

以D irect U i为核心,逐步分析了工业组态的框架构建过程,并分析了如何实现组态各个组件的步骤。通过该组态,可实现组态与其他软件模块的良好融合,生成原生机器码,大大提高软件运行效率。     

A critical review on solvent extraction of rare earths from aqueous solutions

Rare earth elements have unique physicochemical properties that make them essential elements in many high-tech components. Bastnesite (La, Ce)FCO₃, monazite, (Ce, La, Y, Th)PO₄, and xenotime, YPO₄, are the main commercial sources of rare earths. Rare earth minerals are usually beneficiated by flotation or gravity or magnetic processes to produce concentrates that are subsequently leached with aqueous inorganic acids, such as HCl, H₂SO₄, or HNO₃. After filtration or counter current decantation (CCD), solvent extraction is usually used to separate individual rare earths or produce mixed rare earth solutions or compounds. Rare earth producers follow similar principles and schemes when selecting specific solvent extraction routes. The use of cation exchangers, solvation extractants, and anion exchangers, for separating rare earths has been extensively studied. The choice of extractants and aqueous solutions is influenced by both cost considerations and requirements of technical performance. Commercially, D2EHPA, HEHEHP, Versatic 10, TBP, and Aliquat 336 have been widely used in rare earth solvent extraction processes. Up to hundreds of stages of mixers and settlers may be assembled together to achieve the necessary separations. This paper reviews the chemistry of different solvent extractants and typical configurations for rare earth separations.     

Influence of group configuration on online discourse writing

This study examines the impact of different strategies for grouping students in online, discourse-intensive distance education courses. The mixed methods research focused on note writing productivity (based on 366 participants in 25 classes) and participants' perceptions (12 graduate students and 10 instructors) relating to three different class configurations (large whole class, small whole class, large class divided into subgroups). Each configuration exhibited advantages and disadvantages in terms of supporting note writing, however, the data analyses suggested that the advantages for writing in subgroups outweighed those of the other two conditions. Splitting larger classes into smaller subgroups appears to reduce information overload and encourages more focused, in-depth discussions. The research concludes with a list of pedagogical recommendations and suggests new software features that may help learning within specific group configurations. This study may have implications for both practitioners and researchers who wish to promote more fruitful online discussions.     

Modular product platform configuration and co-planning of assembly lines using assembly and disassembly

Formation of products platforms is carried out during the planning stage and very often separately from the planning of corresponding assembly lines. There is a dearth of literature which considers the different aspects of fully integrating platform design, product family formation, assembly line design, delayed product differentiation, and new concepts of mass customization. A Modular Product Platform Configuration model which uses assembly and disassembly for configuring product variants and Co-Planning of products platforms (MPCC) and their assembly Lines is presented. It is used to co-plan the common platform components and the associated product families simultaneously with the planning of its corresponding mixed-model assembly line. Using both assembly and disassembly to customize the product family platform in order to generate product variants is not commonly discussed in literature. It is defined as the formation of platforms for use to derive multiple products by including many components not shared by every product. The platform is then customized by assembling or disassembling components to form different product variants. The model is formulated using mixed integer mathematical programming to minimize the number of assembly stations and cycle time. Two case studies are used for verification and demonstration. They illustrated the ability of the MPCC model to integrate the planning of product platform, product families and the number of assembly stations required to assemble and disassemble components from mass-assembled product platforms to derive new product variants.