發(fā)布時(shí)間：2018-09-18 21:42

【摘要】：為了解決因氣體的特性隨溫度壓力的改變而改變?cè)斐沙暡u街風(fēng)速計(jì)測(cè)量不準(zhǔn)的問(wèn)題,本文提出了一種基于溫壓補(bǔ)償?shù)娘L(fēng)速測(cè)量方法。本文在全面分析渦街風(fēng)速計(jì)的工作原理的基礎(chǔ)上,比較了各類風(fēng)速計(jì)的優(yōu)缺點(diǎn),設(shè)計(jì)了帶有溫壓補(bǔ)償?shù)某暡u街風(fēng)速計(jì),并可通過(guò)上位機(jī)軟件對(duì)風(fēng)速計(jì)進(jìn)行遠(yuǎn)程監(jiān)控。風(fēng)速計(jì)由測(cè)風(fēng)通道和風(fēng)速處理電路組成,其中測(cè)風(fēng)通道包含信號(hào)發(fā)生體和超聲波探頭,風(fēng)速處理電路由超聲波信號(hào)發(fā)射電路和信號(hào)采集處理電路構(gòu)成。本文通過(guò)流體仿真技術(shù)(CFD)對(duì)信號(hào)發(fā)生體進(jìn)行輔助設(shè)計(jì);選用低功率精密振蕩器LTC1799激勵(lì)超聲波換能器產(chǎn)生頻率為150KHz的穩(wěn)定的超聲波載波信號(hào);設(shè)計(jì)一系列模擬電路來(lái)實(shí)現(xiàn)對(duì)經(jīng)過(guò)調(diào)制后的超聲波信號(hào)進(jìn)行解調(diào);采用高精度的溫壓傳感器BMP180來(lái)進(jìn)行溫壓測(cè)量;利用性能穩(wěn)定的AVR單片機(jī)Atmega128來(lái)作為風(fēng)速計(jì)的控制器,用于進(jìn)行數(shù)據(jù)采集處理、上位機(jī)通信和實(shí)時(shí)顯示;利用虛擬儀器Labview對(duì)風(fēng)速計(jì)進(jìn)行遠(yuǎn)程檢測(cè)和校準(zhǔn)。通過(guò)標(biāo)況下和變溫度下風(fēng)速測(cè)試的實(shí)驗(yàn)研究,證明了本文設(shè)計(jì)的風(fēng)速計(jì)的實(shí)際測(cè)量范圍為1.4m/s-30m/s,重復(fù)性小于0.5%。
[Abstract]:In order to solve the problem of inaccurate measurement of ultrasonic vortex anemometer caused by the change of gas characteristics with the change of temperature and pressure, a method of wind speed measurement based on temperature and pressure compensation is proposed in this paper. Based on the analysis of the working principle of vortex anemometer, this paper compares the advantages and disadvantages of all kinds of anemometers, designs an ultrasonic vortex anemometer with temperature and pressure compensation, and can monitor the anemometer remotely by the software of upper computer. The anemometer consists of a wind measuring channel and a wind speed processing circuit, in which the wind measuring channel includes a signal generator and an ultrasonic probe, and the wind speed processing circuit is composed of an ultrasonic signal transmitting circuit and a signal acquisition and processing circuit. In this paper, the signal generator is designed by fluid simulation technology (CFD), the low power precision oscillator (LTC1799) is used to excite the ultrasonic transducer to generate the stable ultrasonic carrier signal with the frequency of 150KHz. A series of analog circuits are designed to demodulate the modulated ultrasonic signal; the high-precision temperature and pressure sensor BMP180 is used to measure the temperature and pressure; the stable AVR microcontroller Atmega128 is used as the controller of the anemometer. It is used for data acquisition, communication and real-time display, and remote detection and calibration of anemometer with virtual instrument Labview. Through the experimental study of wind speed measurement under standard condition and variable temperature, it is proved that the actual measurement range of the anemometer designed in this paper is 1.4 m / s -30 m / s, and the repeatability is less than 0.5%.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TH824

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 李廣峰,劉f ,高勇;超聲波流量計(jì)的高精度測(cè)量技術(shù)[J];儀器儀表學(xué)報(bào);2001年06期

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本文編號(hào)：2249168