基于Labview的虛擬函數(shù)信號發(fā)生器的設(shè)計(jì)外文翻譯

1、中文1963字Labview-based virtual function Signal GeneratorV Marozas, R Jurkonis1 IntroductionSince 1986, the U.S. NI (National Instrument) companies to the concept of virtual instrumentation, along with computer technology and measurement technology, virtual instrument technology has also been developed

2、 rapidly. Virtual instrument means: use of the existing PC, with a specially designed instrument hardware and proprietary software, the formation of the basic functions of both the ordinary instrument, there are usually no special equipment features of the new instrument. Compared with the tradition

3、al instruments of its features are: better measurement accuracy and repeatability; measurement speed; system set up time is short; instrument function defined by the user; scalability; technical updates and quick. Virtual instrument software as the core, the software company Youyi U.S. NI Labview vi

4、rtual instrument software development platform most commonly used. Labview is a graphical programming language, mainly used to develop data acquisition, instrument control and data processing and analysis software, and powerful. Currently, the development of software in the international test, measu

5、rement and control industry, popular, measurement and control areas in the country has also been widely used. Function Generator is a scientific research and engineering design in a widely used general-purpose equipment. The following function signal generator with a virtual design and development o

6、f specific description is based on graphical programming language Labview virtual instrument programming and implementation of technology.2 virtual function signal generator structure and composition2.1 Virtual Function Generator front panelThis virtual function signal generator mainly consists of a

7、 PCI bus, multi-function data acquisition card and appropriate software. Them installed on a PC running Windows95/98/2000/NT the machine, shall constitute a powerful function of signal generator. The design of the virtual function signal generator reference signal generator SG 1645 power functions,

8、front panel shown in Figure 1. Figure 1 virtual function signal generator front panelThe function generator's front panel function of the following components: instrument control button, the output frequency control window (including the frequency of display units), frequency fold into control,

9、waveform selection, frequency tuning button, dc bias, square wave accounts for Air ratio adjustment, the output waveform amplitude control buttons. Frequency tuning range: 0.1 1 Hz; DC bias: -10 10V; square wave duty cycle: 0 to 100%; output waveform range: 0 10V. Also increased the number of modifi

10、cation of voltage-controlled components such as panel input count input, synchronous output, voltage output. Modification of the use of these components is intended to increase the aesthetics of the instrument, and as far as possible with real instruments consistent user interface2.2 Virtual Functio

11、n Signal Generator hardware structureThis virtual function signal generator hardware input and output data acquisition card and a certain configuration requirements of the PC, the data input and output depend on input data acquisition card, the definition of output achieved. This design uses the PCI

12、-1200 data acquisition card is a good cost-effective products, with the D / A conversion functions, can generate the digital signals into analog signals and digital-analog converter and high precision, but also has filtering capabilities, which Smooth the output waveform. It supports the unipolar an

13、d bipolar analog signal input, the signal input ranges of -5 +5 V and 0 10V. Provide 16 single-ended / 8 differential analog input channels, 2 independent of the DA output channels, 24-line TTL digital I / O, 3 16-bit timer counters and other features. Some of the hardware interface for data input o

14、r output channel settings. Some of the hardware interface block diagram shown in Figure 2:Figure 23 Virtual Function Signal Generator Design and ImplementationSome use professional LabVIEW6i software virtual instrument graphical development tools. Virtual function signal generator output waveform ma

15、inly in software production and the output signal frequency display. Changes in the frequency of the output waveform is a concrete realization of data acquisition waveform data written to the buffer among the buffers by setting the update frequency (to change the internal clock frequency) to achieve

16、 the output data frequency. The process is mainly in the use of Labview data acquisition sub-module of the AO START function modules. Function from the implementation point of view, this design features a virtual function signal generator structure includes two modules: Module waveform generator (FG

17、 module) and frequency change control unit (DISPLAY) module. Waveform generator module and call FGEN module. FGEN module for the digital waveform generator module. Digital waveform generator module 3.1Waveform generated virtual function signal generator module is the core of the software. The module

18、 can be realized using sine, square, sawtooth, triangle and other waveforms. Sine wave generation principle is by calling the sin (x) function to implement. In this design, the design of each component sine wave cycle from 1000, using similar language in the For loop C as x assignment, so that the i

19、mplementation of a For loop, you can generate a cycle of sine wave generating the data needed, and then use While Circulation, make the program repeatedly executed, can be continuously output sine wave. Square wave, sawtooth, triangle and sine wave generation theory produce similar principles are ac

20、hieved through the mathematical sequence of numbers representative of the waveform. Compared with the analog signal, generated using the software method of digital waveform sequence although there are some errors, but the election cycle as long as a sufficient number of points, you can make errors t

21、o a minimum, the least impact on the results. Waveform generated by the software one of the biggest advantage is greatly reduced the cost of the instrument and the instrument of small intelligent. Waveform generator module's front panel shown in Figure 3, waveform generation module block diagram

22、 shown in Figure 3Change of 3.2 unit of frequency control moduleWhen the output frequency dynamic range is large, with a single spin button control, due to a small rotation angle, you will have a greater change in the frequency, to the frequency of accurate Shezhi brought greater Kunnan, and frequen

23、cy by using a knob Times by combining the output frequency can greatly improve the control accuracy. In order to improve control accuracy of the output frequency, which in this design, by using the unit of frequency change control module, the output control accuracy can be achieved 0.001Hz. The modu

24、le's front panel shown in, the module block diagram shown in Figure 4 .Figure 44 Total Results:As a Labview graphical programming software development and testing system is a powerful, convenient and efficient programming tools. Similarity between the good, open, exclusive, making the test devel

25、opment cycle is short, low cost and high quality. Labview-based virtual machine interaction with the function signal generator is good, easy to operate and so on, to a wide range of applications and in scientific research, production and other fields.1 Pan H Z, et al. LabVIEW-based virtual Function

26、Signal GeneratorJ . Control Enginerring Practice,2. Evans P D, Brown D. Simulation of brushless DC drivesc IEE Proceedings B, Electric Power Applications，137(5) : 299-3083. René Spée, Alan K. Wallace and Joel Davis. Modeling of brushless dc drive systems with pulse-width modulated excitati

27、onJ, Mathematical and Computer Modelling, Volume 11, 1988, Pages 1166-1171.4. Jawad Faiz, M. R. Azizian and M. Aboulghasemian-Azami. Simulation and analysis of brushless DC motor drives using hysteresis, ramp comparison and predictive current control techniquesJ, Simulation Practice and Theory, Volu

28、me 3, Issue 6, 15 January 1996, Pages 347-363.5. J. Figueroa, C. Brocart, J. Cros and P. Viarouge. Simplified simulation methods for polyphase brushless DC motorsJ. Mathematics and Computers in Simulation, Volume 63, Issues 3-5, 17 November 2003, Pages 209-224.6. J. Shao, D. Nolan, and T. Hopkins. A

29、 Novel Direct Back EMF Detection for Sensodess Brushless DC (BLDC) Motor DrivesC. Applied Power Electronic Conference (APEC 2002), 2002: 33-38.7. Doo-Hee Jung and In-Joong Ha. Low Cost Sensorless Control of Brushless DC Motors Using a Frequency Independent Phase Shifter JIEEE Transactions on power e

30、lectronic, 2000, 15: 744-752.8. Kuang-Yao Cheng and Ying -Yu Tzou. Design of a Sensorless Commutation IC for BLDC Motors JIEEE Transactions On power electronic, 2003, 18: 1365-1375.基于Labview的虛擬函數(shù)信號發(fā)生器的設(shè)計(jì)V Marozas, R Jurkonis1前 言自從1986年美國NI(National Instrument)公司提出虛擬儀器的概念以來,隨著計(jì)算機(jī)技術(shù)和測量技術(shù)的發(fā)展,虛擬儀器技術(shù)也得到很

31、快的發(fā)展。虛擬儀器是指:利用現(xiàn)有的PC機(jī)，加上特殊設(shè)計(jì)的儀器硬件和專用軟件,形成既有普通儀器的基本功能,又有一般儀器所沒有的特殊功能的新型儀器。與傳統(tǒng)的儀器相比其特點(diǎn)主要有:具有更好的測量精度和可重復(fù)性;測量速度快;系統(tǒng)組建時間短;由用戶定義儀器功能;可擴(kuò)展性強(qiáng);技術(shù)更新快等。虛擬儀器以軟件為核心,其軟件又以美國NI公司的Labview虛擬儀器軟件開發(fā)平臺最為常用。Labview是一種圖形化的編程語言,主要用來開發(fā)數(shù)據(jù)采集，儀器控制及數(shù)據(jù)處理分析等軟件,功能強(qiáng)大。目前,該開發(fā)軟件在國際測試、測控行業(yè)比較流行,在國內(nèi)的測控領(lǐng)域也得到廣泛應(yīng)用。函數(shù)信號發(fā)生器是在科學(xué)研究和工程設(shè)計(jì)中廣泛應(yīng)用的一種通

32、用儀器。下面結(jié)合一個虛擬函數(shù)信號發(fā)生器設(shè)計(jì)開發(fā)具體介紹基于圖形化編程語言Labview的虛擬儀器編程方法與實(shí)現(xiàn)技術(shù)。2虛擬函數(shù)信號發(fā)生器的結(jié)構(gòu)與組成2.1虛擬函數(shù)信號發(fā)生器的前面板本虛擬函數(shù)信號發(fā)生器主要由一塊PCI總線的多功能數(shù)據(jù)采集卡和相應(yīng)的軟件組成。將它們安裝在一臺運(yùn)行Windows95/98/2000/NT 的PC機(jī)上，即構(gòu)成一臺功能強(qiáng)大的函數(shù)信號發(fā)生器。本虛擬函數(shù)信號發(fā)生器的設(shè)計(jì)參考了SG 1645功率函數(shù)信號發(fā)生器，前面板如圖1所示。本函數(shù)信號發(fā)生器的前面板主要由以下幾個部分構(gòu)成：儀器控制按鈕，輸出頻率控制窗口（包括頻率顯示單位），頻率倍成控制，波形選擇，頻率微調(diào)按鈕，直流偏置，方

33、波占空比調(diào)節(jié)，輸出波形幅度控制按鈕。頻率微調(diào)范圍：0.11 Hz；直流偏置：-1010V；方波占空比：0100%；輸出波形幅度：010V。此外還增加了許多修飾性的元件如面板上的壓控輸入、記數(shù)輸入、同步輸出、電壓輸出等。使用這些修飾性的元件的目的是為了增加儀器的美觀性，并盡量與真實(shí)儀器的使用界面相一致2.2虛擬函數(shù)信號發(fā)生器的硬件構(gòu)成本虛擬函數(shù)信號發(fā)生器的輸入輸出的硬件部分為一數(shù)據(jù)采集卡和具有一定配置要求的PC機(jī)，數(shù)據(jù)的輸入輸出靠對數(shù)據(jù)采集卡輸出輸入口的定義來實(shí)現(xiàn)。本設(shè)計(jì)采用的PCI-1200數(shù)據(jù)采集卡是一塊性價比較好的產(chǎn)品，具備數(shù)/模轉(zhuǎn)換的功能，能將產(chǎn)生的數(shù)字信號轉(zhuǎn)換成模擬信號且數(shù)模轉(zhuǎn)換精度高，而且還具備濾波功能，從而使輸出波形光滑。它支持單極和雙極性模擬信號輸入，信號輸入范圍分別為-5+5V和010V。提供16路單端/8路差動