基于单片机的电子送经卷取控制系统设计

电子送经卷取系统具有结构简单、品种适应范围广,操作方便等优点．已在高档织造机械中得到广泛应用。以16位MC68HCl6Y1单片机为核心的电子控制系统是专门为高速织机的电子送经卷取系统而设计。此系统采用了交流伺服技术和CAN总线通信技术,对送经卷取运动进行同步控制;同时,采用增量式PID控制算法,实现对经纱张力的动态控制,有效地提高了织物的质量。通过现场调试,系统已实现正常工作,经纱张力基本稳定,达到设计要求。     

电子送经卷取控制系统设计

主要介绍了以16位MC68HC16Y1单片机为核心的电子送经卷取控制系统设计。此系统采用了交流伺服和CAN总线技术,对送经卷取运动进行同步控制,实现经纱张力的动态控制,有效地提高了织物的质量。     

嵌入式电子送经卷取系统设计

利用32位嵌入式处理器MCF5235丰富的硬件资源和嵌入式实时操作系统VxWorks的高实时、高可靠性、多任务等优点,设计了一种高性能的电子送经卷取系统;该系统利用MCF5235的eTPU模块把电机控制功能集成到系统中,降低了系统成本;从系统的硬件架构设计与实现、软件的设计与实现等方面介绍了整个系统,同时还采用了复合控制器对张力进行控制,实现了经纱张力恒定;实验结果为经纱张力波动小于2%,调整时间小于10个织造周期,表明该系统张力波动小、调节时间短。     

剑杆织机送经卷取运动的双控法研究

针对剑杆织机送经卷取运动控制系统存在的启动调节速度慢、调节误差大等问题,提出了一种双控法来调节送经电机转速.用直接控制法控制送经电机转速值,并利用PID调节控制法调节该转速值.实验结果表明,使用该双控法后织机控制系统的启动调节时间小于0.4s,超调量控制在3.2％以内,调节误差控制在1.25％以内,有效地提高了系统张力的稳定性和织物的质量.     

织机电子送经控制系统的设计与实现

针对现阶段国内织机电子送经控制系统的不足和缺点,提出了一种基于S-型张力传感器和32位工业控制ARM微处理器平台的电子送经控制系统;系统采用模糊自整定PID算法控制经纱张力,具体分析了模糊自整定PID算法的原理以及它在电子送经控制系统中应用,对系统的软件、硬件体系结构设计进行了详细介绍,并给出了张力信号变送电路和软件设计流程;实验结果表明,系统对织机的经纱张力控制灵敏,张力稳态误差较小;该系统性能稳定,实用性强,具有一定的应用价值.     

电子送经系统控制器的设计

以织机电子送经系统的设计为例，介绍针对16位微控制器的在系统可编程控制器外围器件PSD4235G2的性能特点及其接口编程技术，给出了硬件和软件设计方法。采用PSD可使电子送经系统设计、修改和扩展大大简化，在嵌入式系统开发和工业控制领域具有良好的应用前景。     

单片机在织机送经系统中的应用

本文阐述了如何提高织机送经机构送经均匀性的问题，重点对采用单片机控制织机送经系统的实现方案进行了论述，最后对单片机控制送经系统的运行情况及推广使用作了说明。     

基于多处理器剑杆织机分布式控制系统设计

针对目前我国织机整体水平落后的现状,采用微机控制与通讯技术开发了一种新型的多微处理器剑杆织机分布式控制系统;根据控制分散、管理集中的设计原则,该系统对电子送经、电子卷取、电子选纬和电子提花等进行模块化设汁;各机构分别由相应的微处理器控制,微处理器间通过串行或并行总线进行信息共享。应用结果表明,该控制系统运行稳定可靠．能满足剑杆织机实时多任务的控制要求,具有较强的实用性和推广价值。     

一种通用的电子送经系统的设计

根据经编机的送经工艺特点,设计了一种通用的电子送经系统。经应用表明该系统人机界面友好、运行可靠。     

贝加莱运动控制技术在多轴向铺纬经编机中的应用

本文简述了贝加莱的伺服控制技术,介绍了多轴向铺纬经编机。具体分析了整机的控制难点：电子送经系统的构成和工作原理,以及铺纬系统的工艺和运动轨迹概述。     

电子通信工程中电子干扰问题探讨

在整个电子通信过程中,抗干扰是确保通信质量的基础,强化抗干扰措施是提升电子通信质量的关键,而接地技术是保障抗电子干扰有效性的重要技术,对电子通信过程中的电子干扰问题进行分析,提出解决措施,阐述抗干扰措施的接地方式、原理和要求等基础内容,并以期满足电子通信工程的要求.     

Electronic marketplaces

We are now witnessing the earliest, experimental stage of electronic marketplace (e-marketplace) development. Most firms are focusing on exchanges with fixed auction rules applied to relatively simple goods and services. Many exchanges will fail due to bad timing or inappropriate choices in business details or technical implementations, but the winners will play a huge role in the worldwide economy as they focus decision-making and improve market efficiencies. How will e-marketplaces evolve? They will almost certainly expand to support ever more complicated scenarios. Even today, multi-round auctions, requests for proposals and negotiations are the norm for expensive procurements; technological advances will permit their use for larger numbers of smaller deals. Processes will be increasingly automated, using sophisticated analysis techniques and large-scale computation. As participants get closer to reaching a deal, they will reveal more information and make further decisions, and new facilities will enable intelligent agents to participate in discovery and transactions. E-marketplaces will also expand to support involvement by skilled specialists who need to share relevant data and to plan and negotiate flexibly. In time, e-marketplaces will include richer collaboration and information management facilities, and will grow to combine the capabilities usually associated with portals and content sites with those of advanced exchanges     

Electronic lexicography

This paper offers a brief survey of some important developments in the use of computers in making dictionaries and lexicons. Making a dictionary involves collecting the data, sorting and lemmatizing, editing and printing. Five major types of machine-readable dictionaries have developed from these procedures: Machine Readable Lexicons of individual authors, Machine Readable Dictionaries with codes for linguistic information, Machine Dictionaries with selected information, and Lexical Databases with lexical information abstracted from machine-readable dictionaries. The second edition of the QED is a machine-readable dictionary with codes that may provide the basis for a diachronic lexical database.     

Electronic Journals

Abstract

This bibliography presents a selected list of articles covering many facets of electronic journals. Due to the extensive amount of literature available, only 1997 articles have been included, and publisher announcements have been excluded. The bibliography listed below, authored by C.W. Bailey, Jr., is an excellent source for earlier publications. To assist browsing, each entry has been placed in a broad topic category. Key e-journal title lists and Internet links are provided at the conclusion.