Theory, simulation, experimentation: an integrated approach toteaching digital control systems

This paper discusses the approach adopted by the authors for teaching an undergraduate course (lecture and laboratory) in digital controls. Theoretical material is developed in the lecture concerning the application of direct digital control (DDC) to an analog bench-scale system consisting of a DC motor and tachometer. A simulation of the closed-loop control system with embedded digital controller is developed and run by the students using the TUTSIM dynamic simulation language. Finally, students perform a laboratory experiment in which they write a program to control the actual system using a personal computer and inexpensive interface card. The combination of hands-on experience and computer simulation with the more traditional, theoretical lecture material provides a well-rounded learning experience that better prepares the students to implement digital control systems in the real world     

Introducing discrete-event control concepts and state-transitionmethodology into control system curricula

A significant academic concern is discussed in terms of introducing the study of methods of discrete-event control in hierarchical systems. This is an area with a blend of computer and control system concepts that is often avoided (or perhaps lost between areas) in undergraduate engineering programs. Applications to factory automation may involve very extensive and critical design considerations, and this area is often an important concern to practicing engineers. The techniques are applicable to a broad range of system design, including systems that provide both discrete and continuous actions such as robots and machine tools. Discrete-action concepts using state-transition techniques are readily assimilated into an undergraduate control systems program, and basic concepts are discussed in terms of introducing this type of program into both the classroom and laboratory. Several variations of state-transition techniques are described, and the various techniques are compared with examples utilizing state-transition diagrams, Petri nets, and state program tables. With the application of digital techniques expanding control concepts in various directions, this is an interdisciplinary area that should be considered to be a fundamentally important part of control system studies     

A Laboratory Environment for the Introduction of Microprocessor Systems into the Electrical Engineering Curriculum: Methodology and Experiences

Major advances in the state of the art of integrated circuit fabrication have created a revolution in computer system technology. Due to the permeation of microcomputer systems into other fields of Engineering and Science, the use of the microcomputer as a laboratory instrument can be integrated into courses other than the core digital systems courses. The development of a laboratory with high level program development tools on a dedicated timesharing system, coupled with facilities to load these programs into a variety of stand-alone microcomputers to support laboratory courses is described. The approach is inherently independent of the evolution in the microcomputer industry and can be used by "non-digital" students. The design, implementation, and use of the laboratory is described.     

Interconnected power systems laboratory: a computer automatedinstructional facility for power system experiments

This paper presents a unique facility capable of exhibiting the operation of modern day power system energy management systems (EMS). The purpose is educational with possible research applications. We present the design and construction of the laboratory facility. Key elements of the facility include a real-life, flexible power system network, signal conditioning hardware, data acquisition (DAQ) equipment, and client/server industry standard computer networking technology. The designed EMS system will allow students to get experience on the realistic operation and control of power systems and expose students to modern supervisory control and data acquisition (SCADA) equipment and procedures used by the power industry     

Educational aspects of CAD supported real time control

Educational aspects of CAD supported real time control are discussed. The historical development of the equipment and appropriate software concerning laboratory exercises in the field of real-time control is briefly described. The hardware and software equipment used in the education process at Ljubljana University is briefly described. Emphasis is given to the equipment developed: a hydraulic-thermal pilot plant, two CACSD program packages with their real-time capabilities, and a special program for real time control in addition to emphasizing their connection in a powerful educational system. Some typical exercises from undergraduate courses, e.g., some experiments on the connection of analog and digital computer, identification of the hydraulic process and its level control, as well as some exercises from a graduate course, e.g., the implementation of adaptive digital filtering in real-time are described. Some difficulties encountered when applying the theory to practical problems are discussed     

A Microcomputer Facility for Teaching Digital Control System Design

A low cost microcomputer control facility for the teaching of computer control theory to final year undergraduates is described. The teaching objectives are the need to offer direct "hands-on" experience of operating an on-line digital computer control system and the provision of a versatile method of studying the efficacy of a range of different computer control algorithms, thus allowing theoretical concepts to be more immediately related to a realistic on-line control environment. The recent availability of microcomputers now makes the provision of such a low cost teaching facility a real possibility.     

A Hardware Digital Controller for Undergraduate DDC Experiments

This paper describes a digital control laboratory facility which teaches the central concepts of digital control without requiring a background in digital systems and/or machine language programming. The heart of the laboratory is a flexible hardware digital controller replacing the traditional analog control components in a D. C. servo system. The digital controller can be adjusted to provide versions of the standard PID control algorithm with adjustable word length and computation delay. Through a series of graded experiments this hardware can provide: (1) an introduction to digital control concepts and components, (2) an introduction to digital signal processing, (3) experience with basic DDC algorithms, (4) experience with problems encountered in the choice of sampling rate and digital word length, and (5) experience in working with and trouble-shooting an operating digital control system. Since one controller can be provided for each laboratory station the student has considerable freedom to learn by doing at his own rate.     

The telecomputing laboratory: a multipurpose laboratory

The authors' telecomputing laboratory is a multiuse state-of-the-art undergraduate teaching facility designed to be both flexible and powerful. The controlled workstation and computer communications facilities allow undergraduate students an opportunity to apply and integrate classroom knowledge in communications, signal processing, computer architecture and algorithm and software development via a set of practical experiments. Students are exposed to state-of-the-art computer communications systems, on which they can implement everything from modern digital communication and signal processing algorithms to parallel algorithms and real-time databases. State-of-the-art computer software provides the undergraduate students modern models of quality software, as well as the tools necessary to design and build sophisticated software/hardware systems. This laboratory significantly impacts many undergraduate students who will take positions with organizations in the telecommunications/computer industry, where the skills gained from laboratory experiences will be greatly valued     

A Computer Engineering Nucleus for Electrical Engineering Curricula

An approach is proposed for including a sequence of four computer engineering courses in required undergraduate electrical engineering curricula. Justification of the need is presented in terms of the modern electrical engineer's involvement with the digital computer. Each course is described in terms of objectives, content, prerequisites, laboratory, credit, scheduling, and possible texts. Implementation of the sequence is also considered in relation to laboratory facility needs, availability of qualified instructors, and accommodation in existing curricula. Experience with a similar arrangement at Auburn University is related.     

An integrated environment for modeling, simulation, digital signalprocessing, and control

An integrated laboratory for system modeling, simulation, real-time digital signal processing, and control is being developed at Bucknell University for undergraduate electrical engineering education. The laboratory bridges the gap between software simulation and testing of actual systems through a common visual programming interface. Students can explore the iterative process of developing a model and then refining the model until computer simulation results agree with experimental measurements. A liquid level control system is presented to illustrate the features of the laboratory environment. The key components of the laboratory are networked digital signal processing (DSP) hardware units and a simulation software package. The simulation software runs on workstations, and all of the laboratory equipment (including the DSP hardware) is connected to the Internet     

An Educational Microcomputer Network Supported by a Time-Sharing Computer Facility

A microcomputer network supported by a time-sharing computer facility is described. The system is suitable for providing large numbers of students with laboratory experience. The software and hardware aspects of the system are presented.     

Purdue's Junior-Level Control Laboratory with Microprocessors

A microprocessor-based direct digital control system laboratory developed at Purdue University is discussed. The microprocessor controller interfaces directly to an analog computer for simulation control or to control components such as motors, heaters, etc. Available resident processor routines (A/D, D/A, arithmetic, timing, etc.) can be easily configured into a digital control system program allowing strategies to be quickly developed and tested. Al operations are performed directly at the control station via a terminal keyboard, and the system has the potential for stand-alone operation with a graphics output terminal A typical digital control system example-servo position control-has been developed for use in the Junior Control Laboratory. In addition to unlimited possibilities for software strategies, patchable features such as comparators, logic circuitry, timing functions, etc., are available on the front panel, allowing quick, efficient development of a complete digital control system.     

An integrated laboratory for electric machines, power systems, andpower electronics

A new-generation laboratory for electric power is described. The design and operation results are discussed. Examples of experiments are presented. The laboratory provides safe, modern, concept-intensive study of power devices and systems. Experience with the facility demonstrated that it is possible to create an integrated approach to the broad area of power devices, systems, and their control, without compromise of the laboratory experience     

A Bit-Sliced Computer Design Laboratnry

A laboratory course in computer organization and design based on the use of bit-sliced microprocessor parts is described. Course objectives are given and the course content is presented. The special laboratory facility developed for the course, which is a microcomputer-based system, is described. Experience in operating the course over the first year is discussed, and plans for the future are outlined.     

HVDC和FACTS控制与保护系统的实时测试技术

阐述了HVDC和FACTS控制与保护系统实时测试技术的发展和应用情况.分析了实时测试的步骤和内容,实时测试对仿真步长、等值系统及仿真模型的要求.论述了模拟仿真器与数字实时仿真系统各自的特点及数模混合实时仿真系统的结构和应用情况.提出了先进的集成混合实时仿真系统和实时数字混合接口的原理、数据交互方式和电压预测技术,对经济有效地扩大实时测试系统的规模具有重要意义.     

基于FPGA的逻辑信号源的设计与实现

本文介绍了逻辑信号源的原理和系统组成.阐述了系统平台的硬件设计及主要单元模块的功能,并对FPGA内部程序设计的主要思想和数据流程作了较详细介绍.仿真结果表明,系统可以输出包括SPI、IIC、USB、RS232、CAN等协议在内的多种串行数字码流,以及并行的数字码流. 测试结果表明,系统可以满足各种数字激励需求的数字信号,它们可以生成所需的1和0的码流,测试计算机总线、微处理器IC设备和其他数字系统.     

Web-based activities around a digital model railroad platform

This paper describes a laboratory equipped for the teaching of advanced courses in computer engineering, computer science, information systems, and software engineering. Other related work areas include computer vision, real-time systems, programming languages, and computer architectures. The laboratory has been built around a digital model railroad platform controlled by a client-server system using an object-oriented language. The characteristics of this laboratory are suitable for implementing Web activities for educational purposes. The paper also includes an overview of the system in which most of these topics have been considered and a summary of the relationship with the most relevant international curricula in computing.     

单片机控制的直流调速系统

本文设计的数字化直流调速系统是用直流电动机作为被控对象,由8031单片机作控制器来实现的。特点是用单片机取代模拟触发器、电流调节器、速度调节器及逻辑切换等硬件设备。本设计进行了硬件设计和软件编程、以及计算机仿真。     

基于LabVIEW的光栅单色仪波长标定装置

为研究在光谱响应度测量中使用的精密光栅单色仪McPherson的Model207的波长特性,介绍了为此建立的基于LabVIEW的光栅单色仪波长标定装置系统。通过RS232与GPIB总线接口将装置的各自动控制部件连接到计算机,实现光谱的自动标定;针对光栅单色仪的性能研究,编写了对应的性能实验程序;在程序中给出了对采集的数据进行处理分析。通过实验得到单色仪波长准确度能达到0.02nm。