嵌入式网络虚拟仪器的固件设计

本文设计的嵌入式网络虚拟仪器的硬件构成由单片机及其外围电路构成.作为虚拟仪器的电量采集网络终端,外围电路包括接入以太网的控制电路以及作为网络数据存储器的扩展电路,A/D转换电路和人-机交互的键盘、显示电路.而嵌入式系统的固件实现主要包括嵌入式Internet在单片机中的实现和单片机各电路模块的控制程序.     

PC机和MCS-51单片机间的串行通信

为了实现PC机和单片机之间的数据交换.人们用各种不同方法实现串行通信.本文介绍了采取专用电平转换芯片MAX232实现Pc机与MCS-51单片机间串行通信的有关技术和方法,并详述了在Visual Basic环境下,上位机利用MSComm通信控件与单片机之间进行RS232异步串行口通信的实现,并给出了实现通信的硬件设计、串行口属性的初始化以及与下位机进行通信的控削代码.     

基于USB接口的微机与单片机通信系统设计

研究了如何利用USB接口实现凌阳61a单片机与普通个人计算机之间的通信系统的设计.整个系统设计中包括电路设计、协议研究、上位机程序设计、下位机程序设计以及驱动程序设计5个方面的内容,所有的程序采用C++语言编写.通过在单片机与计算机之间进行简单的字符信号传递,测试了两者之间利用USB协议传输信息的正确性.     

单片机与PC机串行通信的实现

本文主要介绍了单片机与PC机串行通信的方法,设计了单片机与PC机之间RS232标准串行通信接口电路,给出了单片机与PC机实现串行通信的软件设计方法.     

PC机和MCS-51单片机间的串行通行

为了实现PC机和单片机之间的数据交换,人们用各种不同方法实现串行通信。本文介绍了采取专用电平转换芯片MAX232实现PC机与MCS-51单片机间串行通信的有关技术和方法,并详述了在Visual Basic环境下,上位机利用MSComm通信控件与单片机之间进行RS232异步串行口通信的实现,并给出了实现通信的硬件设计、串行口属性的初始化以及与下位机进行通信的控制代码。     

基于MCS-51单片顶的智能拳击训练控制器

基于MCS-51单片机的智能拳击训练控制器以ATMEL89C51单片机为核心控制器,多位LED数码管静态显示拳击训练参数,以多个发光二极管组作为靶标方位指示,靶标的输入由2片74LS244扩展并采用中断的方式设计.控制器用两组8方位拳击靶标可实现主一随动跟随训练控制,也可由单片机产生随机数的形式实现随机靶标方位训练,或通过串口由上位PC机发布靶标方位等训练形式.     

基于AVR单片机的温湿度记录仪的设计

提出了一种基于AVR单片机的温湿度记录仪的设计。该记录仪采用高性能AVR单片机作为控制核心,实时采集温湿度数据,进行本地存储、本地显示。该记录仪使用红外遥控器进行参数设置、控制本地记录数据的读取。该记录仪记录的历史数据还可以利用串行口传送至上位机,供上位机使用。该记录仪功耗低,可应用于家庭、厂房、大棚、粮仓等对温湿度敏感的环境进行环境监测。     

基于VB的多路数据采集系统的实现

以单片机为核心,设计了PC机与单片机的主从式三路温度数据采集系统,单片机作为从机,负责温度的实时采集,采集结果通过RS-232串口传送至PC机,PC机利用VB6.0进行显示、储存及实时监控,当某路温度过高或者过低时,会给予提示并报警直到恢复正常。VB采用iocomp控件绘制实时温度监测结果,使得监控效果更加直观清晰化。     

MCS-51单片机的多机通信方式研究

多机协同工作已是单片机发展的一个重要趋势,目前单片机多机通信的主要方式仍然是主从式多机通信系统,本文在研究传统的多机通信系统的基础上,设计了一种基于89S52芯片的多机通信系统,实验显示,该系统的通信性能较好.     

单片机控制三维样品台的设计

本文主要介绍了单片机控制三维样品台的发展现状、技术指标以及基本设计思路等.硬件电路部分用CPLD作为步进电机的驱动芯片,单片机作为主控芯片,加上各部分的辅助电路以实现其功能.软件部分分别采用VHDL语言和汇编语言对CPLD和单片机进行编程,实现对步进电机的工作状态的控制,满足样品台的要求.文中还给出了样品台三维定点的基本原理介绍以及利用X荧光仪的检测方法.     

基于单片机控制的抢答器设计

介绍了一种以单片机为核心设计和控制的抢答器。在各种智力竞赛和活动中,这常常是一种反映准确、显示方便的抢答装置,用途极其广泛。它能对采样获得的各路抢答信号进行分析,识别超前违规信号、有效抢答信号,并对它们进行处理,使每一次的抢答过程都有效。该抢答器具有基本的倒计时、抢答、验键、显示、违规判别等功能,优点是设计简洁,操作简单,方便实用。     

基于AT89C52的家用智能电话控制电器和智能报警系统装置

本控制系统是基于电话网络开发的、以单片机AT89C52为核心的家用智能电话控制电器和智能报警系统装置。利用电话网传输数字和语音信息,远程控制部分接收电话网发送来的DTMF信号,对其进行解码,解码后由中央处理器AT89C52分析是哪种情况后做出相应的电器开启和关闭;智能报警部分利用DTMF芯片通过电话网向用户发送报警信息从而完成智能报警。本系统设计实用,功能灵活多样,可靠性高,操作方便,可以广泛地应用于家庭或者其它场所的安全防范和智能控制。     

Adaptive output-feedback control for nonlinear time-delay systems in pure-feedback form

The main contribution of this paper is to develop an adaptive output-feedback control approach for a class of uncertain nonlinear systems with unknown time-varying delays in the pure-feedback form. Both the non-affine nonlinear functions and the unknown time-varying delayed functions related to all state variables are considered. These conditions make the controller design difficult and challenging because the output-feedback controller should be designed using only the output information. In order to overcome these conditions, we design an observer-based adaptive dynamic surface controller where the time-delay effects are compensated by using appropriate Lyapunov–Krasovskii functionals and the function approximation technique using neural networks. A first-order filter is added to the control input to avoid the algebraic loop problem caused by the non-affine structure. It is proved that all the signals in the closed-loop system are semi-globally uniformly bounded and the tracking error converges to an adjustable neighborhood of the origin.     

A new robust fault-tolerant controller for self-repairing flight control system

A new robust fault-tolerant controller scheme integrating a main controller and a compensator for the self-repairing flight control system is discussed. The main controller is designed for high performance of the original faultless system. The compensating controller can be seen as a standalone loop added to the system to compensate the effects of fault guaranteeing the stability of the system. A design method is proposed using nonlinear dynamic inverse control as the main controller and nonlinear extended state observer-based compensator. System robustness is greatly improved by using the new configuration controller. The stability of the whole closed-loop system is analyzed. Feasibility and validity of the new controller is demonstrated with an aircraft simulation example.     

Control of a time-varying hypersonic vehicle model subject to inlet un-start condition

A performance-guaranteed fault-tolerant controller is proposed for air-breathing hypersonic vehicles (AHVs) with synthetical consideration on time-varying uncertain parameters and inlet un-start condition. Different from most of the existing strategies for AHVs, the possible time-varying uncertain parameters in the control-oriented model are accommodated, which makes the resulting controller more adaptable to a real flight. Moreover, the velocity-dependent constraint on angle-of-attack, which is an important factor keeping the scramjet away from inlet un-start, is taken into account. With the utilization of barrier functions in adaptive design, velocity and altitude tracking errors are bounded by specific performance functions. Relevant analysis shows that the tracking performance can be further improved by proper adjustments on design parameters. The effectiveness of our proposed controller is evaluated through a simulation study.     

电机伺服系统基于遗传算法的H∞控制器优化设计

首先,介绍了永磁同步电机位置伺服系统的组成,给出了电机系统的数学模型,并采用参数辨识的方法得到了系统的传递函数。然后,针对系统中存在的不确定性,运用混合灵敏度方法进行了H∞鲁棒控制器设计。为了使系统达到给定的性能指标要求,采用遗传算法对加权函数的选择进行了优化,从而获得了性能优化的H∞控制器。最后,仿真实验验证了该方法的有效性。     

基于Proteus与Keil的单片机项目式教学法

针对高职院校单片机课程实践性强,实验设备有限的情况下,为了改进单片机课程的教学效果、培养学生学习单片机的兴趣及创新能力、实验技能,采用了基于Proteus与Keil的单片机项目式教学方法,通过Proteus与Keil的单片机项目设计与仿真,提高了单片机项目设计效率,获得了很好的经济性、灵活性。     

Pole-placement in discrete systems by using single and multirate sampling

This paper deals with closed-loop pole-placement in discrete, linear systems under single and multirate sampling. The technique is extendable to hybrid systems, i.e. those involving both continuous and discrete substates. The sampling rates for the state, input and output components are used as a controller design technique to achieve closed-loop pole-placement since the controller, which is also discrete or hybrid in the general case, can be periodically reparametrized, the main useful effect of which being the availability of multiple design gains whose number and value are under the designer's choice. The key design factor in the multirate sampling design is that once the closed-loop running sampling period (i.e. that defining the closed-loop dynamics and thus the controller reparametrization periodicity) has been chosen, one can use freedom in the choice of smaller sampling periods for the various plant input and output components as well as for those of the controller state. All these sampling periods are chosen as submultiples of the closed-loop running sampling period.     

Finite/fixed-time synchronization control of coupled memristive neural networks

Finite-time and fixed-time synchronization (FAFS) of coupled memristive neural networks (CMNNs) with discontinuous feedback functions are explored in this paper. Firstly, a more comprehensive stability theory is systematically established. Secondly, by designing adaptive feedback controller and discontinuous feedback controller, both finite-time and fixed-time synchronization can be realized through regulating the main control parameter. Thirdly, 1-norm and quadratic-norm Lyapunov functions are considered simultaneously in this article, while in estimating the settling time, the former one is more accurate than the latter one under the same synchronization criteria. Finally, in numerical simulation, the analysis and comparison of the proposed controllers are given to show the effectiveness of the corresponding results.     

Controller design via the synthesis equation

A comprehensive and efficient frequency domain methodology for the design of controllers for high order single-input-single-output (SISO) plants is presented. The unique advantage of the methodology is that it enables the designer to readily visualize the optimum structure for the controller in the early stage of design. This eliminates time consuming and often frustrating trial-and-error iterations in controller design which is characteristic of many of the current methods. The methodology has been motivated by the need for a streamlined procedure to directly synthesize a low order, robust controller with which the controlled step response can be made to closely match that of a prespecified reference model. The method does not require order reduction of the original model. Also, only output feedback is utilized. The method is applicable to non-minimum phase, unstable, and irrational plant transfer functions. It is ideally suited to design local controllers for the subsystems so that they replicate low order models with compatible dynamic characteristics. Examples are given to demonstrate the method.