基于LabVIEW的网络测试系统的设计

通信工程论文编号:TX409  论文字数:15842,页数:34

摘    要
 实验在普通高等教育中占有非常重要的地位，它是对学生进行素质教育的一个重要环节。随着计算机技术、虚拟仪器技术的发展，虚拟实验室应运而生。虚拟实验作为传统实验的一个必要的有益补充，既能节约大量的教育经费，也使实验在时间和空间上得到有效的延伸。它在教育、科研等领域中具有广阔的应用前景，是实验教学的一个新的发展方向，是当前研究的热点课题之一。因此，虚拟实验室的构建具有重要的现实意义。将虚拟仪器技术推向网络应用，更能发挥其“软件就是仪器”的优势，更有助于形成分布式的网络测试体系，实现数据和仪器的远程共享，从而为实验教学以及远程测控服务。
 本课题以美国NI公司的LabVIEW 8.2为软件开发平台，以虚拟测试系统的数学模型为基础，建立实验室用户登陆系统VI，并嵌入一些虚拟实验仪器的子VI，进而建立相对简单的虚拟实验系统。本文首先介绍课题的研究背景，纵观了该课题在国内外的研究现状，并指出了研究的意义；然后介绍了本课题的研究对象——虚拟仪器，阐述了它的定义、组成、功能、特点及发展前景；接着介绍了虚拟仪器的开发环境——LabVIEW软件，总结了LabVIEW软件的特点，简单地介绍了它的操作工具，重点针对所设计的实验——网络虚拟实验平台，从模块建立、功能介绍、程序说明、实验结果等方面作了详细的阐述；最后是本文的结论，对整个设计进行总结并对将来作了展望。
 
 关键词：虚拟仪器；LabVIEW；登陆模块；系统设计；网络测试

Networked Virtual Instrument Test and Measurement System
Based on LabVIEW

Abstract
 Experiment teaching has been playing an increasingly important role in high education. It's a key measure to improve the students' ability. Virtual Laboratory appears with the devel- opment of computer technique and Virtual Instrument technique. As an essential and benefic- ial supplement to the traditional experiment, virtual experiments not only save a lot of educat- ion funds, but also extend the experiments in time and space effectively. It has the vast applie- d foreground in the education and research realm. Virtual Laboratory is a new development direction of the experiment teaching as well as an active research topic recently. Therefore, the development of the virtual laboratory of network is very necessary. Virtual Instrument Technology being applied to network construction can develop its preponderance-“The Soft ware is the Instrument” and help to form distributed network measuring system to accomplish data and instruments sharing for experiment teaching & learning or distant test control.
 This subject regards LabVIEW 8.2 of U.S.A. NI Company as the engineering workbench of software, is based on mathematics model of the network testing system, to set up sub VI of virtual laboratory user login system, and embed some virtual instruments Sub VI, and then design the motor experiment that the series can be applied to simple Virtual Laboratory system. This thesis introduces the research background of the subject at first, make a general survey of this research current situation at home and abroad, and has pointed out the significance of research; Then introduced the research object ―― virtual instrument, has explained its definition, composition, function, characteristic and development prospect; Then has introduced the development environment of the virtual instrument ――LabVIEW software, has summarized the characteristic of LabVIEW software, has introduced its operation tool briefly, Then direct against the experiment designed especially ―― Network Virtual Laboratory System, have done detailed exposition from the respects , such as model setting up, function introduction, procedure proving, experimental result, etc. It is a conclusion of this thesis finally, to designing and summarized and looked forward to future entirely.

Keywords: Virtual Instrument; LabVIEW; Loading Module; System Design;   Network Test
目    录
摘    要 I
Abstract II
1 绪论 1
1.1 课题背景 1
1.1.1 虚拟仪器在国内高校实验教学应用情况 1
1.1.2 虚拟仪器在国外高校实验教学中的应用现状 2
1.2 研究意义 3
2 虚拟仪器技术 4
2.1 虚拟仪器概述 4
2.1.1 虚拟仪器技术的由来 4
2.1.2 虚拟仪器技术的定义 4
2.2 虚拟仪器的组成 5
2.2.1 虚拟仪器硬件平台 5
2.2.2 虚拟仪器软件系统 5
2.3 虚拟仪器的功能及特点 6
2.3.1 虚拟仪器的功能 6
2.3.2 虚拟仪器的特点 6
2.4 虚拟仪器的应用前景 7
3 LabVIEW软件开发平台 8
3.1 概述 8
3.2  LabVIEW软件的特点 8
3.3  LabVIEW应用程序的构成 9
3.3.1 前面板介绍 9
3.3.2 流程图介绍 10
3.3.3 图标/连接器简介 10
3.4  LabVIEW的操作选板 11
3.4.1 工具选板简介 11
3.4.2 控件选板简介 11
3.4.3 函数选板简介 12
3.5  LabVIEW设计虚拟仪器的方法 13
4 基于LabVIEW的网络虚拟实验室的设计与实现 15
4.1 虚拟实验室的概念及特点 15
4.2 虚拟实验室的设计与实现 15
4.2.1 系统设计的总体方案 15
4.2.2 系统设计的总体目标 16
4.2.3 系统设计的软件结构 16
4.2.4 系统用户认证模块的实现 17
4.2.5 系统虚拟实验仪器简介 25
结    论 27
参 考 文 献 28
致    谢 29