自动控制系统中系统调试方法的研究

本文叙述了在自动控制系统工程中进行系统调试时,通常应注意的问题,以及调试的过程,与步骧的顺序.将分为以下几个方面进行讨论:熟悉设计过程;熟悉现场控制系统元/部件的情况,熟悉现场工艺设备的情况,电气系统检查;对执行元件进行调试;单元系统运行调试;控制系统联动远行的调试.     

电厂计算机控制系统开发及调试平台

目前电厂计算机控制系统的调试都是在现场进行的,使得工程周期很长.为了能在实验室进行调试,缩短开发周期,在电力系统及大型发电设备安全控制和仿真国家重点实验室研制了电厂计算机控制系统开发及调试平台.该平台软件上应用了自动建模技术实现电厂热力实时仿真和控制系统的图形化组态,控制系统硬件上采用分层的冗余结构,形成了多策略控制方案.控制系统硬件与仿真软件相连接可对控制系统软硬件进行调试,对用户进行培训,开展高级控制策略的研究.该平台的成功应用表明了它是可靠、方便的.文章最后论述了该平台的研制及特点.     

有关建筑设备监控系统建设的探讨

对建筑设备监控系统中监控点表的作用、确定进行了探讨,从控制系统调试、单体调试、系统调试三个方面对建筑设备监控系统的调试过程进行了阐述,并对系统的验收、竣工给出了具体要求,指出监控点表是指导系统设计、系统施工、系统调试、系统验收的重要依据.     

一种基于PLC的加热炉温度控制系统设计

详细阐述了一种实际的加热炉温度控制系统的设计,从总体控制结构、硬件、软件和安装调试等方面进行了全面叙述,给出了整个控制系统的设计过程.     

单自由度主控式磁悬浮系统分析

控制系统的设计是高速磁浮主轴单元设计的一个重要环节。本文首先建立了单自由度磁悬浮闭环控制系统的数学模型, 在此基础上进行计算机仿真, 调试系统参数, 并分析系统动刚度特性。最后将仿真参数用于实际系统调试, 通过实验分析系统动特性。     

汽包锅炉给水全程控制系统分析的几个关键问题

汽包锅炉给水全程控制系统是火力发电厂单元机组主要的控制系统之一．通过对汽包锅炉给水全程控制系统的分析,提出了系统分析时应注意的几个关键问题．这几个关键问题对汽包锅炉给水全程控制系统的分析、设计和调试均具有一定的参考价值．     

基于“工作过程系统化”的课程开发

《电气控制系统的制作、调试与维护》课程的建设促进了机电一体化技术专业课程体系的优化,适应了"工学结合、校企合作"的人才培养模式。文章从"职业行动领域描述、学习目标、学习情景、教学方法与手段、理论和实践教学及评价"等六个方面介绍了《电气控制系统的制作、调试与维护》课程的建设。     

绞车变频提升系统设计

对矿区的交流提升机经典控制系统（TKD电控系统）改造为以PLC为控制核心的低压变频控制系统,使绞车控制集中化,调试更加平稳节能。     

MODBUS总线PLC冷库自动化控制系统

基于PLC技术研究了冷库自动化控制系统,包括硬件组成、软件结构以及MODBUS总线结构。该冷库现已调试完毕投入使用。     

多层升降横移式立体停车库的结构和控制系统

介绍了立体停车库的主要形式 ,着重分析了多层升降横移式立体停车库的结构及控制系统原理 ,编制了多层升降横移式立体停车库控制系统的程序 .经调试、运行证明 :采用可编程序控制器 (PLC)作为控制系统可行、简单且易于实现     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.