大直径开孔数控火焰切割机的研制

介绍了DKK-1型大直径开孔数控火焰切割机的设计方案及实际使用情况.该设备可完成在圆柱壳体上的大直径相贯圆孔的开孔及切坡口工作,开孔直径范围(Φ1.0～3.0m).所开孔可以是正交孔,也可以是偏心孔,并可切割变角度上下坡口.割炬高度变化范围:1.0m,切割厚度变化范围:30～120mm,切割圆孔精度:±1mm.采用齿圈转桥式旋转机构、悬臂和弧板式枪摆机构相结合的结构设计.采用程序控制、示教和人机共享控制相结合的控制策略.工控机作为数控系统主机,三相混合式步进电机作为控制电机,光电编码器作为测量器件.本文着重对机械结构设计、数控系统软硬件设计进行了讨论,并给出了设计中应注意的一些问题.本设备已成功地应用于舰船建造.     

计算机数控串珠绳锯切割机

采用模糊控制技术、变频传动技术、步进驱动技术研制出计算机数控串珠绳锯切割机.该机使用带闭环的变频传动技术取代传统的伺服传动,切割精度为0.15mm.采用IPC工控机和西门子S7-200PLC为主控机,人机界面好,易于编程.改变生产品种,只需修改数控程序,而不需制做模型,大大节省了投资.     

基于数据库管理系统的电机设计集成系统软件开发

本文基于电机设计的基本原理 ,采用Access数据库管理技术、面向对象技术、SQL查询语言 ,利用VisualBasic 6.0为工具开发了基于数据库管理系统的电机设计集成系统软件。在实际使用中充分证明 ,该软件操作方便、运行良好、可维护性高 ,软件计算结果比较接近实验值。     

From First Conception to First Demonstration: the Nascent Years of Machine Translation, 1947–1954. A Chronology

The early history of applying electronic computers to the task of translating natural languages is chronicled, from the first suggestions by Warren Weaver in March 1947 to the first demonstration of a working, if limited, program in January 1954.     

高精度七米激光测长机的误差补偿技术

简要介绍一笔者研制的大型计量测试仪器－“高精度七米激光测长机及其计量管理系统”的工作原理，详细地介绍了其测量过程中采用的误差补偿技术并进行实验验证。     

Error Analysis for High-precision 7m Laser Measuring Machine

This paper introduces a high precision 7m laser measuring instrument developedby the anthors and its operating principle,and systematically analyses the errors havinginfluence on the performance of the measuring instrument.Error analysis and actualverification indicate that all the characteristics reached or exceeded the original designspecifications.     

PLC 控制的榨菜自动包装机控制系统的可靠性研究及其通讯监测

本文着重研究了榨菜自动包装机控制系统的可靠性，并对其运行状态进行通讯监测     

Simulation based on learning methods

The use of simulation technology as a tool for planning and control is of increasing significance in most fields of production. The main part of the expenditure concerning simulation analyses is the modelling of the considered production. Despite the use of modern building-block-oriented modelling technology, this modelling can often not be done by the user, but only by external experts. Against this backdrop, an adaptive simulation system is being developed by the Institute for Industrial Manufacturing and Management (IFF) at the University of Stuttgart. It independently adapts to real production processes, i.e. it learns about the interdependencies of production processes, and, in this way, supports the user in constructing and maintaining the model. In terms of information technology, the research in the field of artificial intelligence, especially in the subdomain of machine learning, is the basis for the realization of such adaptive systems.     

Incremental Feature Selection

Feature selection is a problem of finding relevant features. When the number of features of a dataset is large and its number of patterns is huge, an effective method of feature selection can help in dimensionality reduction. An incremental probabilistic algorithm is designed and implemented as an alternative to the exhaustive and heuristic approaches. Theoretical analysis is given to support the idea of the probabilistic algorithm in finding an optimal or near-optimal subset of features. Experimental results suggest that (1) the probabilistic algorithm is effective in obtaining optimal/suboptimal feature subsets; (2) its incremental version expedites feature selection further when the number of patterns is large and can scale up without sacrificing the quality of selected features.     

异步电机软起动装置的模糊控制器设计研究

介绍了DRQ系列异步电机软起动装置的硬件电路。在此基础上着重讨论了其模糊控制器的设计,探讨了模糊控制器量化因子和比例因子的选择与整定方法,使模糊控制与电流瞬时值采样相配合,达到了良好的控制效果。该方法电流波动小,无电流冲击与振荡现象。