基于LabVIEW的网络虚拟测控实验系统设计

摘要

目前，在中国许多高校中使用的教学仪器，仍大多为相当落后的传统仪器。随着科学技术的不断发展以及相应学科高等教育课程教学内容的更新，传统仪器日益暴露出一些缺陷和不足。为了改善实验条件，改善实验教学方法，更新实验教学内容，提高实验教学课程的开设水平，把虚拟仪器引入实验教学已成为一种必然趋势。本文就是基于虚拟仪器在电机实验教学的应用设计。

虚拟仪器（Virtual Instrument）是现代计算机计算和仪器技术相结合的产物。将虚拟仪器技术引进实验教学，目的是更新实验设备，降低实验设备购置费用，减小实验测量过程中的人为误差，提高实验测量的准确度；在激发学生自主学习的积极性、促进学生动手实践和增强创新意识的方面意义重大。

本文以美国NI公司的LabVIEW 8.6为软件开发平台，以差动变面积式电容传感器、金属箔式应变片电桥性能等实验为基础，对测控试验进行整体虚拟，分别建立两实验的模型子VI，进而设计出系列可以脱离于仪器教学的虚拟实验。

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，除此之外还对LabVIEW的插件LabSQL作了简单地介绍；然后重点针对所设计的实验——差动变面积式电容传感器实验和金属箔式应变片电桥性能实验，从模型建立、功能介绍、程序说明、实验结果等方面作了详细的阐述；在结束之前介绍了如何通过网络发布在局域网内构建虚拟实验室；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；软件开发；实验教学；差动电容；应变片电桥

Web-based Virtual Experiment System Measurement and Control

Abstract

At present, the teaching instrument that used in a lot of universities in China is still mostly quite backward traditional instruments. With the developing of science and technology and renewal of corresponding content of courses of higher education course, the traditional instrument exposes some defects and deficiencies day by day. In order to improve the experiment conditions, improve the teaching method of the experiment, upgrade the content of courses of the experiment, improve the competence of offering of teaching course of the experiment, leading the virtual instrument into experiment teaching has become a kind of inexorable trend. This thesis is about the designs of application in experiment teaching of motor with the virtual instrument.

The virtual instrument is a product that the modern computer calculated and instrument technology combined together. Importing the virtual instrument technology into experiment teaching, the purpose is to upgrade experimental installation, reduce the purchase expenses of experimental installation, reduce the human caused error in the measuring of experiment, improve the accuracy that the experiment measures; There is great significance in the respect of exciting the enthusiasm that students study independently, promoting students to start to practise and strengthening innovative consciousness.

This thesis regards LabVIEW 8.6 of U.S.A. NI Company as the engineering workbench of software, is based on mathematics model of the induction motor, to the thing that the induction motor carries on the whole fictitiously, set up sub VI of induction motor model, and then design the motor experiment that the series can be applied to experiment teaching.

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, in addition has also introduced LabSQL, the plug of LabVIEW ,briefly;Then direct against the experiment designed especially —– Differential variable capacitance sensor area of experimental and metal foil strain gauge bridge performance test, have done detailed exposition from the respects , such as model setting up , function introduction , procedure proving , experimental result ,etc.;before the end,describe how to build web publishing in the local area network virtual laboratory; It is a conclusion of this thesis finally, to designing and summarized and looked forward to future entirely.

Keyword: virtual instrument;LabVIEW; engineering of software; experiment teaching;

differential capacitance,;strain gauge bridge