基于LabVIEW的網絡測試系統的設計

通信工程論文編號:TX409  論文字數:15842,頁數:34

摘    要
 實驗在普通高等教育中占有非常重要的地位，它是對學生進行素質教育的一個重要環節。隨著計算機技術、虛擬儀器技術的發展，虛擬實驗室應運而生。虛擬實驗作為傳統實驗的一個必要的有益補充，既能節約大量的教育經費，也使實驗在時間和空間上得到有效的延伸。它在教育、科研等領域中具有廣闊的應用前景，是實驗教學的一個新的發展方向，是當前研究的熱點課題之一。因此，虛擬實驗室的構建具有重要的現實意義。將虛擬儀器技術推向網絡應用，更能發揮其“軟件就是儀器”的優勢，更有助于形成分布式的網絡測試體系，實現數據和儀器的遠程共享，從而為實驗教學以及遠程測控服務。
 本課題以美國NI公司的LabVIEW 8.2為軟件開發平臺，以虛擬測試系統的數學模型為基礎，建立實驗室用戶登陸系統VI，并嵌入一些虛擬實驗儀器的子VI，進而建立相對簡單的虛擬實驗系統。本文首先介紹課題的研究背景，縱觀了該課題在國內外的研究現狀，并指出了研究的意義；然后介紹了本課題的研究對象——虛擬儀器，闡述了它的定義、組成、功能、特點及發展前景；接著介紹了虛擬儀器的開發環境——LabVIEW軟件，總結了LabVIEW軟件的特點，簡單地介紹了它的操作工具，重點針對所設計的實驗——網絡虛擬實驗平臺，從模塊建立、功能介紹、程序說明、實驗結果等方面作了詳細的闡述；最后是本文的結論，對整個設計進行總結并對將來作了展望。
 
 關鍵詞：虛擬儀器；LabVIEW；登陸模塊；系統設計；網絡測試

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    錄
摘    要 I
Abstract II
1 緒論 1
1.1 課題背景 1
1.1.1 虛擬儀器在國內高校實驗教學應用情況 1
1.1.2 虛擬儀器在國外高校實驗教學中的應用現狀 2
1.2 研究意義 3
2 虛擬儀器技術 4
2.1 虛擬儀器概述 4
2.1.1 虛擬儀器技術的由來 4
2.1.2 虛擬儀器技術的定義 4
2.2 虛擬儀器的組成 5
2.2.1 虛擬儀器硬件平臺 5
2.2.2 虛擬儀器軟件系統 5
2.3 虛擬儀器的功能及特點 6
2.3.1 虛擬儀器的功能 6
2.3.2 虛擬儀器的特點 6
2.4 虛擬儀器的應用前景 7
3 LabVIEW軟件開發平臺 8
3.1 概述 8
3.2  LabVIEW軟件的特點 8
3.3  LabVIEW應用程序的構成 9
3.3.1 前面板介紹 9
3.3.2 流程圖介紹 10
3.3.3 圖標/連接器簡介 10
3.4  LabVIEW的操作選板 11
3.4.1 工具選板簡介 11
3.4.2 控件選板簡介 11
3.4.3 函數選板簡介 12
3.5  LabVIEW設計虛擬儀器的方法 13
4 基于LabVIEW的網絡虛擬實驗室的設計與實現 15
4.1 虛擬實驗室的概念及特點 15
4.2 虛擬實驗室的設計與實現 15
4.2.1 系統設計的總體方案 15
4.2.2 系統設計的總體目標 16
4.2.3 系統設計的軟件結構 16
4.2.4 系統用戶認證模塊的實現 17
4.2.5 系統虛擬實驗儀器簡介 25
結    論 27
參 考 文 獻 28
致    謝 29