一种新型SR固态物料料位探测系统

开关型磁阻电机调速系统是80年代中期发展起来的新型交流调速系统,它融新的电机结构－ 开关型磁阻电机与现代电子电力技术、控制技术为一体,其性能优于传统的调速系统,应用前景诱人。简单介绍应用开关型磁阻电机的固态物料料位探测系统的原理,重点介绍系统的硬件和软件。现场应用表明,该系统控制灵活,调试方便,可靠性高,具有应用推广价值。     

开关磁阻调速电机在冶金企业的节能应用试验

简要介绍了开关磁阻调速电机的技术原理及特点,通过在线应用试验,验证了开关磁阻调速电机的节电性能,提出了节能应用方向及相关建议。     

电气传动控制系统新一簇——开关磁阻电机调速系统

本文介绍了开关磁阻电机调速系统的国内外发展概况以及该系统驱动电源电路种类和控制装置的发展方向。通过将该系统与直流电动机和鼠笼式异步电动机调速系统的比较,提出了一种实用的以单片机为核心的开关磁阻电机调速系统。     

开关磁阻电机调速系统在莱钢热轧带钢中的应用

文章介绍了开关磁阻电机调速系统的结构、原理及在莱钢轧钢厂热轧带钢生产线上的应用。     

开关磁阻电机调速系统在空压机、渣浆泵中的应用

高效节能电机与普通电机的功率等级及安装尺寸相同,所不同的是开关磁阻电机调速系统损耗低,效率高,缺相不烧电机。用高效节能电机是从根本上实现节能的最佳途径。     

双辊筒开放式炼胶机电力拖动系统改造

主要介绍了炼胶生产设备XK-560A型双辊筒开放式炼胶机的工艺流程及作业中存在的弊端,分析了开关磁阻电机的作业特点及优良调速性能、高可靠性、高效节能的优势[3-6]。对比两种电力拖动系统作业的效果,提高炼胶作业的工作效率及加强安全操作,降低炼胶过程中的能源损耗。     

开关磁阻电机在汽轮机射水抽气系统中的应用

应用开关磁阻电机对汽轮机射水抽气系统中射水泵电机进行了改造,通过对电机控制参数的设定及修正,满足了射水抽气系统工艺要求,节约了电能,取得预期效果。     

液力偶合器在高炉喷煤抽风机上的应用分析

液力偶合器在高炉喷煤抽风机上的应用分析广东省韶钢集团公司戴跃年前言本文介绍韶钢集团公司炼铁厂通过喷煤工序中抽风机使用调速型液力偶合器，对整个喷煤系统设备运行状况和电机运行参数的比较及电机节电量的计算，说明了用调速型液力偶合器对鼠笼式电机所驱动的风机负...     

M84160B型轧辊磨床常见故障分析

介绍M84160B型轧辊磨床头架电机和砂轮电机的调速系统，分析头架电机和砂轮电机的调速系统过流原因，以及合闸后系统不工作等故障的原因。提出处理方法，并进行改进，以保证设备的正常使用。     

变频调速器在桥式抓斗吊车中的应用

论文主要介绍了电机的调速方法、变频器的工作原理以及日本FRNIC500G7型变频器在桥式抓斗吊车上的应用，并分析了使用绕线式电机调速与鼠笼式电机变频调速之间的优缺点。     

Radiographic assessment of knee osteoarthritis: reproducibility and sensitivity to change

OBJECTIVE: To determine the cross sectional and longitudinal reproducibility of various measures used for assessing radiographic knee osteoarthritis (OA) and to compare the sensitivity to change over a one year period of these measures. METHODS: We studied 55 patients referred to hospital with knee OA (clinical and radiographic ACR criteria). Anteroposterior radiographs at baseline and after 12 months were read by methods both qualitative (Kellgren and Lawrence grading scale, joint space narrowing scale) and quantitative (joint space width measurement at 3 different points). All qualitative methods used standardized atlases. The intraclass correlation coefficient and the graphical method of Bland and Altman were used to assess cross sectional and longitudinal reproducibility. Reproducibility was tested using 2 readers (interreader) and 2 readings for one of the readers (intrareader). Sensitivity to change was assessed using standardized response mean (SRM). RESULTS: All methods tested were shown to be reproducible both for cross sectional and longitudinal data. Intrareader was higher than interreader reproducibility for most radiographic features. Significant changes were observed after one year for methods measuring joint space narrowing. The sensitivity to change of the methods assessing joint space narrowing (joint space narrowing scale and joint space width measurement) was higher, with SRM varying from 0.37 to 0.57, than for the Kellgren and Lawrence grading system (SRM 0.19 and 0.23). CONCLUSION: These data suggest that methods measuring narrowing should be preferred as outcome measures in clinical trials or longitudinal epidemiologic studies; and show that in a particular subset of patients with very active disease, significant radiographic changes in knee OA can be detected after a one year period.     

快速以太网在凌钢中宽带热轧厂精轧机主传动改造中的应用

应用美国AVTRON公司全数字ADD32控制装置成功完成了凌钢中宽热轧带钢厂(880mm)6套精轧机主传动电控系统的数字化改造,同时完成了传动级(L0)网络的改造。其中快速以太网(100Base FX)在传动级的应用在国内尚属先例,其快速性、稳定性和可靠性在实际使用中得到了充分验证,真正实现了传动级与基础自动化级(L1)和过程控制级(L2)的完美融合和无缝连接。本文主要介绍本系统中快速以太网的应用。     

热轧带钢激光平坦度仪的研究与设计

介绍了用于热轧带钢板形检测的激光平坦度仪工作原理，开发了平坦度在线连续测量仪及其系统软件。系统采用激光器和线阵CCD组成的位移测量装置，同时测量带钢操作侧、中心和传动侧的带钢纤维长度，得到平坦度和非对称度信息。仪器投入运行后，取得了满意的测量效果。     

QCS—50/B02型桥式双梁起重机电子吊秤研制应用

通过研制Ｂ—Ｆ型传力复位机构,确保传感器轴向加载,提高了ＱＣＳ—５０／Ｂ０２型电子吊秤的准确度;研制ＬＸ－ＴＢＸ型重量补偿装置,完善准静态计量功能;配置稳定可靠计量数据处理系统,可获取准确完整的计量信息。     

Automax DPS在攀钢冷轧酸洗线的应用

主要介绍Automax DPS-SD3000直流传动控制系统原理及在攀钢冷轧厂酸洗线的应用。Automax DPS将传动分成不同的层次进行控制，通过Automax PLC处理器进行较高级别的控制运算和传动控制调整，用UDC控制模块进行外部控制环处理，用PMI系统进行功率模块的实时控制。     

湘钢新高线精轧和减定径机组传动控制系统

湘钢新高线精轧和减定机组采用了ABB（瑞士）公司ACS6000中压变频传动控制系统,它的主回路拓扑为交-直-交电压型结构,采用了三电平PWM控制方式,整流和逆变器大功率元件使用了ABB公司生产的IGCT,精轧和减定径采用多传技术。通过对这套传动系统的特点和性能分析,为类似生产线选择电气传动系统提供一定的参考。     

Contribution to the modelling of stretch reducing of tubes

Computer-aided simulation is becoming more and more important for the further development of the stretch reducing mill (SRM). The available methods of calculation, however, are not satisfactory. The complete simulation of the process with a finite element method cannot yet be carried out within a reasonable time, whereas the results obtained with the help of simpler models are sometimes very inaccurate. The development of an efficient model aims at considerably improving the relation between expenditure and return as compared with the above-mentioned methods of calculation. Based on today's knowledge of the process, fundamental extensions have been made to the known conventional SRM model. According to forming history the process model of the extended SRM model is composed of two partial models. The first partial model describes the forming process which takes place in the pass and approximates the real three-dimensional rolling process with the help of axisymmetric elements. The second partial model describes the behaviour of the workpiece in the space between the stands. The gradual calculation of the deformation in the space between the passes is derived from the equilibrium of forces in axial direction and with the help of suitable hot stress-strain curve functions. An efficient and fast SRM simulation program has been drawn up on the basis of this extended elementary model. The results obtained were found to correspond very well to the measuring results obtained in numerous rolling trials. The model approach described in this paper can also be applied to other longitudinal rolling processes.     

板坯定位在马钢1580热轧板坯库中应用

介绍了马钢1580热轧板坯库区域中，电气传动系统、基础自动化系统、工业网络通讯软硬件的基本配置；以及在没有专门的实时测速装置测量板坯的运行速度情况下，采用PLC程序设计结合冷金属检测器（CMD）信号、传动装置速度反馈为基准的板坯自动定位方案的实现方法。     

基于DSP的开关磁阻电动机控制研究

开关磁阻电动机(SRM)由于其显著的特点而得到业界广泛的关注。研究了基于数字信号处理器(DSP)的开关磁阻电动机闭环控制系统,开关磁阻电动机主电路采用TI公司生产的TMS 320 F2812DSP控制芯片,其控制性能较之单片机控制有了显著的提高;介绍了控制器设计和仿真实验,为开关磁阻电动机的广泛应用提供了支持。仿真和实验结果验证了理论分析的正确性与实用性。