摘要
基于Internet的远程教育是21世纪教育发展的重要形式，而课程实验教学是制约高等工程教育实现远程化的一大难点。本文的工作是通过Internet实现《计算机控制技术》远程实验教学的一项创新研究，为解决这一难题提供了可行的手段。
本文通过对远程实验系统的需求分析、功能定义和运行性能分析，设计了由网络服务器、设备服务器与客户端组成的双Client／Server系统框架，并设计了基于VbScript脚本语言的可编程控制器。开发过程中运用了软件工程方法对系统进行需求分析、概要设计、详细设计、代码实现和性能评测，并利用统一建模语言(UML)描述系统设计。
学生可以通过远程计算机对实验设备进行实时操作控制。学生可以利用可编程控制器编辑环境编写自己设计的控制器，通过系统实现对设备的控制，并得到实验结果。系统支持本地控制器控制模式，可以完成包括数字PID控制、模糊控制和单神经元控制等多种计算机控制实验；系统同时支持远程控制器控制，可以完成计算机远程实时控制实验。
远程实时控制是计算机控制技术发展的一个新方向，目前处于探索阶段。论文从构建计算机控制远程网络实验室入手，实现了本地控制器模式与远程控制器模式的网络实验系统，并在最后探讨了远程控制器的实现中存在的问题。
The distance education based on Internet is an important way to the development of education in 21th Century, but the distance learning of experiment courses is becoming a big barrier for distance engineering education. The work of this thesis is a creative study and provides a realizable method on the distance learning experiment of the ((computer control techniques)) course.
Based on the requirement analysis, function definition and performance study, a double client/server system architecture , consisting of Net Server Device Server and Client ,was constructed. A programmable controller based on VbScript Script Language was designed .The system was developed with software engineering method by the steps of function analysis, synoptic design, detailed design, coding ,test and performance evaluate. Unite Modeling Language(UML) was used to describe the system design.
Students can operation the remote devices via Internet. Students can code there control strategy by programmable controller environments, then control the real remote device and get the experiments' result. The system support remote-control mode and local-control mode, and can accomplish many control strategy includes PID control, fuzzy control, single-neuron control etc.
Real-time remote access control is one of the new direction of computer control technique, and now is under seeking and developing. This thesis begins with system design of an remote access control experiment Virtual Laboratory(VL), and accomplished remote experiments via Internet by remote-control mode and local-control mode, at last, issues and limitations of remote-access control are discussed.
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