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ID:25042820
大小:124.18 KB
页数:16页
时间:2018-11-16
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1、大连交通大学信息工程学院2012届本科生毕业设计(论文)外文翻译大连交通大学信息工程学院毕业设计(论文)外文翻译学生姓名1111专业班级自动化0111班指导教师1111职称 11111所在单位电气工程系教研室主任 完成日期1111年4月13日15大连交通大学信息工程学院2012届本科生毕业设计(论文)外文翻译DateAcquisitionDateacquisitionsystemsareusedtoacquireprocessoperatingdataandstoreitonsecondarystoragedevicesforlateranalysis.Manyofthedataac
2、quisitionsystemsacquirethisdataatveryhighspeedsandverylittlecomputertimeislefttocarryoutanynecessary,ordesirable,datamanipulationsorreduction.Allthedataarestoredonsecondarystoragedevicesandmanipulatedsubsequentlytoderivethevariablesofinterest.Itisveryoftennecessarytodesignspecialpurposedataacqu
3、isitionsystemsandinterfacestoacquirethehighspeedprocessdata.Thisspecialpurposedesigncanbeanexpensiveproposition.Powerfulmini-andmainframecomputersareusedtocombinethedataacquisitionwithotherfunctionssuchascomparisonsbetweentheactualoutputandthedesirableoutputvalues,andtothendecideonthecontrolact
4、ionwhichmustbetakentoensurethattheoutputvariablesliewithinpre-setlimits.Thecomputingpowerrequiredwilldependuponthetypeofprocesscontrolsystemimplemented.Softwarerequirementsforcarryingoutproportional,ratioorthreetermcontrolofprocessvariablesarerelativelytrivial,andmicrocomputerscanbeusedtoimplem
5、entsuchprocesscontrolsystems.Itwouldnotbepossibletousemanyofthecurrentlyavailablemicrocomputersfortheimplementationofhighspeedadaptivecontrolsystemswhichrequiretheuseofsuitableprocessmodelsandconsiderableon-linemanipulationofdata.Microcomputerbaseddataloggersareusedtocarryoutintermediatefunctio
6、nssuchasdataacquisitionatcomparativelylowspeeds,simplemathematicalmanipulationsofrawdataandsomeformsofdatareduction.Thefirstgenerationofdataloggers,withoutanyprogrammablecomputingfacilities,wereusedsimplyforslowspeeddataacquisitionfromuptoonehundredchannels.Alltheacquireddatacouldbepunchedouton
7、papertapeorprintedforsubsequentanalysis.Suchhardwireddataloggersarebeingreplacedbythenewgenerationofdataloggerswhichincorporatemicrocomputersandcanbeprogrammedbytheuser.Theyofferanextremelygoodmethodofcollectingtheprocessdata,usin
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