超声波气体流量计的研制开发

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1、同济大学声学研究所硕士学位论文超声波气体流量计的研制开发姓名：黄雪杰申请学位级别：硕士专业：声学指导教师：朱士明20040301AbstractUltrasonicgasflowmeasurementtechniqueisanewtechniquethathasbeendevelopedinthesetenyears．Duetothewideapplicationofcoalgasandnaturalgasandthemodernizationofindustrialproductionsaswellasthegradualimplementatio

2、noftheimportantnationalproject．thegastransportationfromWesttoEastofChina，underthesecircumstances．detectingthegasflowhasbecomemoreandmoreattractiveandimportant．Ultrasonicgasflowmeterhasmanyadvantagesoversomeothergasflowmeters．Itseemssimpletomeasurethegasflowratebytheultrasonicme

3、thodthroughmeasuringthetransit．timeorvelocityofthedownstreamandupstreaminthepipe．However，becauseofthecomplexityofthemeasurementenvironment，therearemanyfactorsthatcanaffectthemeasurementprecisionsuchasthevarietyofthevelocityprofileandthequalityofthetransducerandSOon．Somanypracti

4、calproblemsstillhavenotbeensolved，thispaperwillanalyzethefollowingparts：(1)Theprincipleofultrasonicvelocity．differencemethodandthecorrectionfactoroftheflow—meter，aswellasthefactorsinfluencingthemeasurementaccuracyandtheapproachofimprovingithavebeendiscussed．(2)Introducethedesig

5、nprincipleandthestructuralrequirementoftransducerswithfilling，putforwardsomerequirementsofthetransducersthatweuseanddesignsomeexperimentstomaketwotransducersapairandmeasurethetimeofultrasoniC．(3)Calculatetheinfluenceofmanyasymmetricalvelocityprofilesonthemeasurementaccuracyoffl

6、owmeter，andanalyzetheeffectofdifferentinstallationsoftransducersonmeasurementaccuracy．(4)Introducethecommondiagnosticapproachesinultrasonicgasflowmeter，inaddition，solvetheproblemsofultrasonicgasflowmterusingnervenetwork．(5)Finally，studyingtheimplementationandcalibrationoftheult

7、rasonicflowmeter．Mainlyintroducethestructureandprincipleoftheflowmeter．What’Smore，introducetheprincipleofthecalibrationsystemwhichUSeSSOnicnozzlesandcalibratiOnresults．声明尸明本人郑重声明：本论文是在导师的指导下，独立进行研究工作所取得的成果，撰写成硕士学位论文“趋直这氢笠速量让鲍硒壹4珏筮：。除论文中已经注明引用的内容外，对论文的研究做出重要贡献的个人和集体，均已在文中以明确方式标明

8、。本论文中不包含任何未加明确注明的其他个人或集体己经公开发表或未公开发表的成果。本声明的法律责任由本人承担。