外文翻譯---脈沖輸出型數(shù)字渦街流量計(jì)的研究-免費(fèi)閱讀
【正文】 本課題是在前人研究成果的基礎(chǔ)上，針對國內(nèi)生產(chǎn)的渦街流量計(jì)還限于模擬渦街流量計(jì)的現(xiàn)狀，研究并實(shí)現(xiàn)了一臺實(shí)用的脈沖輸出型數(shù)字渦街流量計(jì)。近幾年，關(guān)于渦街信號處理方法的研究很多（如小波變化法、自適應(yīng)LMS算法等），由天津大學(xué)張濤教授主持研究的對渦街傳感器輸出信號進(jìn)行數(shù)字信號處理方面的探索獲得了很大的進(jìn)展。按檢測方式劃分，渦街流量計(jì)可分為應(yīng)力式、電容式、熱敏式、超聲式、振動式、應(yīng)變式、光電式和光纖式等。早在1878年斯特勞哈（Strophe）就發(fā)表了關(guān)于流體振動頻率與流速關(guān)系的文章，斯特勞哈數(shù)就是表示渦街頻率與阻擋體特征尺寸、流速關(guān)系的相似準(zhǔn)則。將此數(shù)字渦街分別在天津大學(xué)水流量實(shí)驗(yàn)裝置和氣體流量實(shí)驗(yàn)裝置上做了量的實(shí)驗(yàn)，結(jié)果表明本脈沖輸出型數(shù)字渦街流量計(jì)具有很低的測量下限，有效擴(kuò)大了渦街的量程比，抗干擾能力強(qiáng)，實(shí)時(shí)性好，具有很高的實(shí)用價(jià)值。 Control Laboratory in Tianjin University. And the data shows that the digital flow meter has the property of a better lower limit than the analog one and a bigger range ratio of 1:～. Masses of experiments on the digital vortex flow meter have been carried out at the water flow experiment facility and the gas flow experiment facility of Tianjin University respectively. The result shows that the pulse output model digital vortex flow meter has a satisfying lower limit that increases the range ratio effectively, strong ability and good real time and thus it is of great practicability.The 21st century is the century information, information and materials and new technology as the main pillar of society from the human revolution is industrialization era to information era, as the perception, acquisition, conversion, processing and transmission of information technology and the indispensable testing instrument, has bee an important technology and puter equivalent and daily life and production of all fields. Along with the rapid development of science and technology, industrial production get continuous development, the detection technology and puts forward many new requirements, and new technology and instrument appearance and further promote the development of science and technology, the development degree of detecting technology has decided to science and technology level, in other words detection techniques and instruments is the measure of modern science and technology level of a mark. This one, as testing technology is an important part of flow metering with national economic and national defense, science and technology, the close relationship in economic development plays an important position.After continuous efforts, and technical workers have developed pyretic and various characteristics of flow meter. According to the measuring method and the structure of the classification method, will be divided into differential pressure meter flowmeter, volumetric flowmeter, fluid flow, ultrasonic vibration flowmeter, mass flowmeter, insert flowmeter openchannel flow and other flowmeter, 11 kinds . The research of the vortex flowmeter belongs to the hydrodynamic vibration flowmeter are widely used .Vortex flowmeter is according to the fluid velocity of vibration frequency and the corresponding principle of work. As early as in 1878 straw Strophe published about fluid velocity relationship with the vib
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