嵌入式系统在智能电梯中的应用

首先介绍了嵌入式系统的组成及特点,然后提出了一种应用于电梯控制系统中的新型、高效的嵌入式控制系统结构DSP CPLD,最后给出了嵌入式实时操作系统在电梯控制中的应用.     

基于通用平台的电梯系统的设计

单片机在电梯升降控制上的应用主要体现在它的逻辑开关控制功能。由于单片机具有逻辑运算、计数和定时以及数据输入输出的功能,在电梯升降过程中,各种逻辑开关控制与单片机很好的结合,很好的实现了对电梯升降的控制。本文介绍了基于虚拟通用平台的电梯控制系统的研究和设计。主要介绍了电梯控制系统的硬件设计方法、系统构成及软件设计。该设计方法主要用于实验室教学研究。     

基于可编程控制器PLC的电梯控制系统

随着人民生活水平的逐步提高,电梯已经成为日常生活中必不可少的交通工具,尤其是在一些高层建筑中,住户上下楼都离不开一部方便快捷的电梯。科技发展日新月异,电梯逐渐抛弃了老式控制系统而采用全新的PLC控制系统。本文介绍了可编程控制器PLC在电梯控制系统中的作用,重点分析了控制系统的基本组成结构以及实现过程。笔者认为,可编程控制器PLC终将以其方便灵活、性能稳定等优点占领电梯控制系统领域。     

基于西门子AS—Interface总线技术的电梯控制系统

本文着重阐述了西门子AS—Imtefface总线技术的特点及实现方式。简要介绍了电梯控制系统的发展现状和西门子总线技术在电梯控制系统中应用的背景，并从硬件和软件两方面详细说明了西门子AS-Imtefface总线技术在电梯控制系统中的应用以及远程监控的实现。最后对西门子PLC在电梯控制系统中的开发进行了经济技术综合指标分析。     

基于Lonworks技术的电梯控制系统的设计

电梯是现代高层建筑不可缺少的交通工具,目前多数电梯采用PLC控制.本文提出了一种基于Lonworks现场总线技术的电梯控制系统的设计方法.论文先介绍了Lonworks现场总线技术的概述,然后重点介绍了电梯控制系统的硬件组成:电梯控制系统由四部分组成.分别是电梯控制硬件模型,控制模块,LonBuilder开发平台,本地监控机.并且编制程序调度电梯运行.实验测试达到了预期的效果.     

PLC在电梯控制系统中的应用

本文介绍了PLC在电梯控制系统中的应用。采用变频器、光电编码器、高速计数器完成了PLC对电梯的控制。主要给出了电梯控制系统组成、PLC I/O口分配,系统主要软件设计。     

浅谈PLC在电梯控制系统中的应用

电梯已经成为了高层建筑中必不可少的运输工具,为了保证电梯运行既高效节能又安全可靠,可采用可编程控制器PLC来控制电梯系统。主要介绍了基于PLC的电梯控制系统的基本结构和软件开发,分析了采用PLC在电梯控制系统中应用的优势。     

基于PLC的电梯智能控制系统设计

介绍电梯的结构,以4层楼电梯为例,阐述电梯控制系统的软、硬件设计。     

基于CANopen协议的电梯控制系统的研究

在分析CANopen协议结构和特点的基础上,通过对比现有电梯控制方法,给出了基于CANopen协议的电梯控制系统方案.着重介绍了具有双CANopen总线的电梯控制系统,为引入新型电梯协议标准--CANopen lift打下基础.     

指纹识别技术在电梯控制系统的应用

介绍了指纹识别技术的原理及其在智能楼宇电梯控制系统中的应用,详细介绍该系统的结构、功能及软件开发实现的方法。     

吊车防摆技术的研究

本文介绍了为消除吊车在吊运货物时引起的摆动进行的实验研究。实验方法都有各自的优缺点和所适用的场所、环境。证明了最优调节器防摆、模糊控制防摆和自适应防摆等都有良好的防摆效果。     

解耦控制的现状及发展

通过对多变量系统解耦设计的必要性分析,介绍了传统解耦、自适应解耦、鲁棒解耦、智能解耦等各种解耦方法,并叙述了各种方法的研究现状和应用情况,同时分析了各种方法局限性。指出解耦控制领域的研究已成为控制理论和控制工程界共同关注的热点。自适应解耦与智能解耦,侧重于控制器的研究,它们更多采用试探、优化方法来设计控制器．理论研究还尚待完善。因此,寻求一种有效的、简单易行的控制方法,即寻求理论与实际结合点,是今后研究的方向。     

一种专家智能控制器的仿真研究

该文提出一种专家智能控制器（简称为ＥＩ控制器）．该控制器的参数可基于专家知识和过程参数的变化实时进行调整。仿真结果表明对于工业过程中的大纯滞后、非线性、变参数特性能获得较为满意的调节效果。     

专家PID控制在印染过程温度控制中的应用

对于具有较大时滞,非线性和时变性特点的打样机对象(它是印染行业中的一种小型设备),常规PID控制方法往往难以达到良好的控制效果.本文将专家控制器与常规PID控制器相结合,提出了一种智能控制器结构.试验表明,与常规PID控制器相比,该控制器的控制精度有了明显的提高.     

模糊PID在电阻加热炉温控系统中的应用

在PID控制和Fuzzy控制的基础上,提出了一种模糊自调整PID控制,并基于Matlab对电阻加热炉温控系统进行了仿真。结果表明,模糊PID控制能使系统达到良好的控制效果。     

Networked Control Systems: A Survey of Trends and Techniques

Networked control systems are spatially distributed systems in which the communication between sensors, actuators,and controllers occurs through a shared band-limited digital communication network. Several advantages of the network architectures include reduced system wiring, plug and play devices,increased system agility, and ease of system diagnosis and maintenance. Consequently, networked control is the current trend for industrial automation and has ever-increasing applications in a wide range of areas, such as smart grids, manufacturing systems,process control, automobiles, automated highway systems, and unmanned aerial vehicles. The modelling, analysis, and control of networked control systems have received considerable attention in the last two decades. The ‘control over networks’ is one of the key research directions for networked control systems. This paper aims at presenting a survey of trends and techniques in networked control systems from the perspective of ‘control over networks’, providing a snapshot of five control issues: sampled-data control, quantization control, networked control, event-triggered control, and security control. Some challenging issues are suggested to direct the future research.     

Stabilization of robot motion and contact force interaction for third-order motor dynamics

An approach to the synthesis of control laws stabilizing motion and force in contact tasks, based on the exponential stability of the closed-loop control system, is described. When using the synthesized control laws, simultaneous stabilization of both motion and force is achieved with a preset quality of the transient responses. The task is solved in a most general form, taking into account the constraints on robot control, its position and the force of interaction of the robot and the environment, and the external perturbations and inaccuracies of the measuring sensors, when the environment dynamics is being described by nonlinear second-order differential equation, and the robot dynamics includes the third-order equations of the robot actuators dynamics.     

The preview control of a class of linear systems and its application in the fault-tolerant control theory

In the fault-tolerant control theory based on model following control, the desired signal of the control system is the output of a reference system. This paper is concerned with the design of the preview controller for a class of fault systems. A composite vector is introduced by including error vector, fault system state vector and reference system state vector. Then, we derived an augmented system from the known system equation, in which the reference input has equal status with the desired signal in the traditional preview control theory. Therefore, we can use the known theory to design the preview controller for the augmented system, then the preview controller of the original fault system can be obtained by the integration method. This paper strictly discusses the connection between stabilisation and detectability of the augmented system and the corresponding characteristics of the original system. Finally, by applying this theory to a real steam generator water level control system, it is found that the actions of the reference input preview and the fault signal preview can effectively eliminate the effect of the fault signal on the water level of the steam generator. The simulation shows the effectiveness of the controller designed.     

Decentralized control of the Tennessee Eastman Challenge Process

A decentralized control system is developed for the Tennessee Eastman Challenge Process (TE problem). The design procedure begins with the selection of the method for production-rate control, to which inventory controls and other functions are then coordinated. Results show that production rate can be maximized at any of the three standard product compositions, even when the feed of reactant A is lost. All specifications of the challenge problem are satisfied despite large disturbances in feed composition and reaction kinetics. Variability in product rate and quality is less than that seen in previous studies. The process can operate on-spec for long periods without feedback from composition measurements. Setpoints for certain variables (such as reactor temperature and concentrations of A and C in the reactor feed) must be chosen a priori, and the effect on operating cost is estimated. The performance of the proposed decentralized control is compared to that of a nonlinear model predictive control (NMPC) developed previously. There appears to be little, if any, advantage to the use of NMPC in this application. In particular, the decentralized strategy does a better job of handling constraints - an area in which NMPC is reputed to excel. Reasons for this are discussed.     

粗轧控制系统的设计与应用

结合生产实际,对粗轧控制系统进行综合设计。介绍粗轧控制系统的结构,以及粗轧核心APC控制、粗轧RAWC控制和带钢SSC控制的控制思想并给出相应控制算法。