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虚拟仪器是指基于计算机的数字化仪器,应用虚拟仪器取代传统测量仪器对机械参数进行在线测量是今后的发展方向。本文介绍了虚拟仪器的概念,并举例说明在其在测试领域中的应用。 相似文献
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该机载设备供电电源检测系统的信号采集部分由单片机89C51、A/D转换器、电压和电流互感器以及相应的信号调理电路组成,硬件结构紧凑;上位计算机软件采用虚拟仪器软件LabWindows/CVI6.0开发,通过串口通信实现了对电源参数的实时采集和监控,软件功能强大且人机界面友好。该系统实现了飞机检修过程中电源的动态检测和故障定位,具有检测实时、故障诊断准确等特点。 相似文献
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网络化虚拟仪器的构建 总被引:1,自引:0,他引:1
虚拟仪器技术和网络技术为测量领域带来了巨大的变革,使传统意义的测量发生了质的飞跃。本文将虚拟仪器技术和网络测量技术相结合阐述了网络虚拟仪器的实现途径,指出“网络就是仪器”将成为测量领域新的发展趋势。 相似文献
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目前,在电子测量和自动控制领域,虚拟仪器技术的发展日新月异。虚拟仪器借助于计算机技术和基本硬件的支持,其数字化和软件技术极大地提高了测量的灵活性和可扩展性。基于虚拟仪器的电子测量技术代表了现代测试技术的发展方向,本文是就虚拟仪器的发展现状和前景展望作了粗浅论述。 相似文献
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本文阐述了虚拟仪器测量系统的软、硬件组成,测量工作原理及主要设备构成,分析罗列出虚拟仪器测量系统中影响测量装置不确定度的各项因素。 相似文献
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详细介绍了一套基于PC/104总线和虚拟仪器技术的飞机电源产品综合测试系统的功能和软硬件实现原理。阐述了测试系统的设计原理,最后结合整个系统设计介绍了在LabVIEW环境下测试系统软件的设计和实现。 相似文献
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介绍了一种基于虚拟仪器PXI总线的飞机供电特性参数测试系统的设计与实现,在设计该测试系统时采用了符合PXI总线规定的硬件仪器模块,使用图形化编程语言Labview设计了飞机供电特性参数的各种测试算法,实现了多通道同时快速数据采集以及并行同步采集。通过虚拟仪器面板的交互式使用,使界面简单明了、非常便于操作。通过对国产某型飞机供电系统的测试实验。结果表明该系统设计先进、稳定可靠、测试结果达到了要求的精度,对于被测的稳态以及瞬态参数有很好的性能,具有非常广泛的应用前景。 相似文献
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基于"数据驱动计量"的通用微波小功率自动计量系统 总被引:1,自引:1,他引:0
目前各种微波小功率计量自动控制系统都是针对特定配置研制的,缺乏通用性和扩展性,造成重复开发。针对此问题,基于VC.net2003平台和VPP虚拟仪器软件规范,提出了设备数据封装协议,从而实现了基于“数据驱动计量”的通用微波小功率自动计量系统。目前,系统可以完成十多家知名企业的几十种功率座和功率计产品自动计量检定。通过扩展向导,用户可自己添加需要扩展的仪器,并且具备了数据输入输出、数据检测、数据管理、数据对比、设备管理、即时流程控制、不确定度分析等多项实用功能。该系统提高了实验室功率校准的准确度、速度,提高了效率。 相似文献
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Evaluating and selecting suppliers is an essential part of effectively managing today's dynamic and global supply chains. In this paper, we propose a supplier evaluation and selection methodology based on an extension of data envelopment analysis (DEA) that can evaluate suppliers in an efficient manner. Through the incorporations of a range of virtual standards, the proposed methodology termed augmented DEA, has enhanced discriminatory power over basic DEA models to rank suppliers. In addition, weight constraints are introduced to reduce the possibility of having inappropriate input and output factor weights. We demonstrate the application of augmented DEA with comparison experiments and find that the augmented DEA model has advantages over the basic DEA model as well as the cross-efficiency and super-efficiency models. Finally, we present a case application with data obtained from a communication and aviation electronics company to demonstrate the applicability and use of augmented DEA. 相似文献
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Bucci G. Fiorucci E. Landi C. 《IEEE transactions on instrumentation and measurement》2003,52(1):75-84
Today there is a wide application of different electronic apparatus that both produce electromagnetic disturbances on the supply power system and are sensitive to them. Power disturbances present on typical electric utility distribution systems degrade product quality, increase process downtime, and dissatisfy commercial customers. For these reasons, the monitoring of the quality of the supply networks has become an issue of international interest. To monitor power quality, in this paper, we propose a digital measurement station. Its main features are remote data transmission capability and reduced cost. It is a PC-based virtual instrument that offers the flexibility due to the high-level programming language, the familiar working environment of Windows, and the low cost of a widely used computer. The local area network or a modem card allows the measurement system to be controlled via a transmission control protocol/Internet protocol network, implementing in this way a distributed power quality evaluation system. 相似文献
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A computer-based data acquisition system coupled by means of a general-purpose instrumentation bus (IEEE488/GPIB) with a digital oscilloscope is used to create a virtual instrument with instantaneous and average power measurement capability. The software signal-processing capability of the data acquisition system was used to compensate instrument measurement deficiencies and to enhance signal capture. The virtual instrument is shown to provide instantaneous, AC, and fitted-power averages and time-based plots of power variations for both linear and nonlinear system responses to external excitation. Data taken on a resistor, capacitors, an AC-to-DC power converter, and a bipolar junction transistor inverter establish a ±3% sensitivity with a 10-μW-100-W range over a 1-Hz-10-MHz frequency span 相似文献
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基于虚拟仪器的呼吸参数测量系统 总被引:1,自引:0,他引:1
介绍了一种基于虚拟仪器的呼吸参数测量系统,由硬件和软件两部分组成。硬件主要采用传感器、调理电路、数据采集和通用计算机,软件采用LabVIEW编程,由于有大量成熟的软件模块,大大提高了开发效率,经扩展可适应其他生理数据的采集和处理。 相似文献