棒材生产线飞剪故障分析与处理

通过对棒材生产线飞剪控制过程的分析,找出剪切异常的原因,解决飞剪剪切异常的问题.     

棒材倍尺飞剪T400控制方案优化

针对热轧棒材倍尺飞剪高速剪切时存在速度滞后并超调,影响产品质量,制约生产线运行速度的问题,对采用T400工艺板控制的热轧棒材倍尺飞剪,从原理上解析速度给定曲线对负载电流的影响,以参数化编程的方式实现控制方案优化。生产运行结果表明,采用优化控制方案,实现了倍尺飞剪高速精确剪切,达到了工艺要求的控制效果。     

成品倍尺飞剪剪切模型设计

以倍尺飞剪在棒材生产线上的应用为例,阐述了如何实现飞剪倍尺剪切功能,介绍了由西门子PLC控制系统,FM450计数器模块、6R80直流调速器搭建的系统架构在飞剪倍尺剪切模型设计功能上的应用.同时也介绍了如何保证飞剪动作的快速响应以及制动的控制策略.     

高线飞剪控制系统

介绍高线飞剪控制系统,该系统采用主轧线S7-400PLC,配置FM458功能模块对飞剪进行逻辑控制、精确剪切、精准定位,从而实现系统的安全可靠运行。     

高线飞剪控制原理及故障处理

本文着重介绍了高线飞剪的工作过程和控制原理。飞剪的起动和制动电流、恒速剪切速度及工作周期是飞剪控制的关键参数,只有控制好上述参数,才能确保飞剪正常运行。此外,还简要地介绍了飞剪的常见故障及其处理方法。     

GE Rx7i PLC在热连轧带钢生产线飞剪控制系统中的应用

本文主要介绍GE Rx7i PLC在热连轧带钢生产线飞剪定尺剪切控制系统中的应用,分析飞剪剪切控制原理,推导飞剪剪切方程,对提高飞剪的作业率和带钢质量以及下一步升级优化剪切具有较高的参考价值与指导意义.     

轧钢高线飞剪剪刃精准控制方法的改进研究

通过对飞剪控制系统的飞剪剪刃定位进行分析以及对直流调速装置的原理和控制方法进行剖析,对调速功率单元进行了改进,给出了一种基于多H桥双向功率变换器的硬件拓扑结构的控制方案。在控制算法上,对飞剪电机采用抛物线的控制算法,使得剪刃能够更快更准确的定位。     

飞剪控制系统的研究

飞剪是棒、线材生产工程中的关键设备,其按照工艺要求,以一定的规格尺寸对棒、线材进行切头、切尾、切定尺、切试样以及处理事故;但在实际生产过程中经常遇到飞剪切弯头、飞剪定位不准、检测信号不稳定等问题,为降低产线设备故障率,提高产线经济效益,对飞剪控制系统进行研究意义重大.     

起动式飞剪的微型机控制

用微机完成起动式飞剪对高速线材的剪切,可以提高剪切精度,降低废品率,具有很高的经济效益。本文讨论了飞剪微机控制系统的数学模型,提出自动校正砰-砰控制开关参数闭环位置系统的算法,并给出实现该系统的微机硬件和软件结构框图。     

包米勒伺服系统在飞剪机上的应用

本文介绍了包米勒公司的伺服驱动系统以及飞剪控制的关键技术,通过针对飞剪应用开发的功能模块,实现对钢筋进行高速、高精度的定长剪切。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.