科里奥利质量流量计数字信号处理方法的研究

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1、合肥工业大学博士学位论文科里奥利质量流量计数字信号处理方法的研究姓名：倪伟申请学位级别：博士专业：精密仪器及机械指导教师：徐科军20040701ResearchonDigitalSignalProcessingMethodsofCoriolisMassFlowmetersAbstractCoriolismassflowmetersarewidelyusedinmanyvariousindustrialfieldsduetotheirf01．10wingadvantages：measuringthemassflowratedirectly，highmeasurementaccuracyandm

2、easuringdensityoffluidsatthesametime，etcTheconventionalCoriolismassflowmetersadoptthesignalprocessingmethodbased011analogcircuits．whichhavemanyshortcomings，suchasbeingsensitivetonoise．Soweusedigitalsignalprocessingmethodstodealwiththesig．na／sofCoriolismetersThispapermainlystudiesthesignalenhancinga

3、ndfrequencyestimatingmethodsbasedonadaptivelineenhancetechniqueandthetimeintervalcalculationbasedondiscreteFouriertrans—formandslidingGoertzelalgorithmforCoriolismassflowmeters．Themainworkofthisdissetntationisasfollows：(1)According10thecharacteristicsoftheoutputsignals，atime—varyingsignalmodelbased

4、onrandomwalkmodelisproposedThismodelandcorrespondingsignalprocessingmethodsarehelpfolt'orresearchesondynamiccharacteristicsofCorlolismassmetel·s(2)Usingdirecttype11RadaptivelineenhancertoenhanceCoriolismassmeterssignalandestimateitsfrequencyDifferentimplementationsofthistypeenhancerfortime—stationa

5、ryandtime—varyingsignalarealsogiven．(3)DuetotheshortcomingsofdirecttypeIIRadaptivelineenhancer．usinglatticetypefIRadaptivelineenhancerisproposedDifferentimplementationsofthisenhancerfortime．stationaryandtime。varyingsignalarealsostudied．Duringthestudyfortime-varyingsignal，theoriginalalgorithmisimpro

6、vedTheimprovedalgorithmcantrackfrequencyvariationofthetime—varyingsignalwithnoextracalculationburden．(4)ForthepossibilityofimplementingCoriolismassflowmeterswithFPGA．usingnormal．izedlatticetypeIIRadaptivelineenhancertoenhanceCoriolismassflowmeterssignalsandes．timatetheirfrequenciesareproposed(5)Usi

7、ngdiscreteFouriertransformwithHanningwindowtocalculatethetimeintervalofCoriolismeterssignalsisstudied．ThenaccordingtothedisadvantagesofDFTmethod，usingslidingGoertzelalgorithmisproposedThisalgorithmcanavoidt