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1、实用高等教育自学考试质量技术监督管理专业毕业设计题目：天然气孔板流量计量的误差分析及改进专业：质量技术监督管理考号：400109171024考生姓名：韩陆_指导教师：王伟华哈尔滨理工大学2010年8月30日文档实用文档实用摘要随着工业自动化技术的发展，变频器的应用越来越广泛，其优良的调速性能和明显的节能效果也被人们日益称道，但变频器在运行过程中产生的谐波对电网的危害也愈发严重，因此，抑制谐波干扰，改善电能质量的要求也越来越迫切。本文对变频器的原理进行了阐述，并对应用过程中存在的谐波干扰问题，进行
2、了详细地阐述，提出了解决的办法关键词变频器，谐波，滤波，变频器干扰文档实用AbstractAsakindofhighqualitynaturalenergyandchemicalrawmaterials,itsmeasurementmoreandmoreattentionbypeople.Sothegasmeasuringworkappearsespeciallyimportant,andtheaccuracyofthemeasurementofgasflowintheuseofnaturalg
3、asisanimportantproblemmustbesolved.Inenterpriseproductionandmanagementofflowmeasurementisadailybasisofimportanttechnologies.Accuratemeasurementofgascannotonlyfairtradesettlement,andcanimprovetheproductionprocess,improveproductquality,reduceproduction
4、costandimprovetheeconomicbenefitandsocialbenefit.Gasmeteringwithdifferentialflowmeterisnowtheorificeflowmeter.Inactualproduction,duetotheinfluenceoftheorificeflowmetermeasurementerrorreasonisverycomplex,oftenleadstoitscannotsatisfythemeasurementaccur
5、acyrequirements.Therefore,findoutthemeasuringerrorandimprovementmeasuresareproposedforpracticalproductionactivitieshasimportantsignificance.Thismeasureerror,usefromconditions文档实用changeerror,errorandcalculatingcoefficientsoftemperamentalconditionscaus
6、edbyerror,andotherfactorsareanalyzedintermsoftheerrorcausedbyfivefactorsofmeasuringerror,andputsforwardthestrictlyaccordingtothestandardprocessingorificeplate,correctinstallationandrationalselectionofdifferentialpressurerange,eliminatepulsation,reduc
7、etheflow,reasonablesolutionexcessripple,strengtheningthedailymanagement,theparametersreasonablyfixedquantity,istoensurethatthegasmeasurementaccuracyoftraceabilityandeffectivemeasuresandusingcanchangeorificeplateandcustomizedthrottledevice,expandthesc
8、alerangethrottledevice,promotingthedevelopmentofautomationintelligentmeasuringwaysandusesofcomputernumericalsolutionflowimprovementmeasuresofsixaspects.Finallythefuturedevelopmentdirectionoftheorificeflowmeter.KeywordsGasmeasurement；Orificeflowmeter；
