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ID:6006754
大小:39.97 KB
页数:16页
时间:2017-12-30
《数据采集 毕业论文外文翻译》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、DateAcquisitionDateacquisitionsystemsareusedtoacquireprocessoperatingdataandstoreitonsecondarystoragedevicesforlateranalysis.Manyofthedataacquisitionsystemsacquirethisdataatveryhighspeedsandverylittlecomputertimeislefttocarryoutanynecessary,ordesirable,datamanipulationsorreduction.Allthedataaresto
2、redonsecondarystoragedevicesandmanipulatedsubsequentlytoderivethevariablesofinterest.Itisveryoftennecessarytodesignspecialpurposedataacquisitionsystemsandinterfacestoacquirethehighspeedprocessdata.Thisspecialpurposedesigncanbeanexpensiveproposition.Powerfulmini-andmainframecomputersareusedtocombin
3、ethedataacquisitionwithotherfunctionssuchascomparisonsbetweentheactualoutputandthedesirableoutputvalues,andtothendecideonthecontrolactionwhichmustbetakentoensurethattheoutputvariablesliewithinpre-setlimits.Thecomputingpowerrequiredwilldependuponthetypeofprocesscontrolsystemimplemented.Softwarerequ
4、irementsforcarryingoutproportional,ratioorthreetermcontrolofprocessvariablesarerelativelytrivial,andmicrocomputerscanbeusedtoimplementsuchprocesscontrolsystems.Itwouldnotbepossibletousemanyofthecurrentlyavailablemicrocomputersfortheimplementationofhighspeedadaptivecontrolsystemswhichrequiretheuseo
5、fsuitableprocessmodelsandconsiderableon-linemanipulationofdata.Microcomputerbaseddataloggersareusedtocarryoutintermediatefunctionssuchasdataacquisitionatcomparativelylowspeeds,simplemathematicalmanipulationsofrawdataandsomeformsofdatareduction.Thefirstgenerationofdataloggers,withoutanyprogrammable
6、computingfacilities,wereusedsimplyforslowspeeddataacquisitionfromuptoonehundredchannels.Alltheacquireddatacouldbepunchedoutonpapertapeorprintedforsubsequentanalysis.Suchhardwireddataloggersarebeingreplacedbythenewgenerationofdataloggerswhichincorporatemicrocomputersandcanbeprogrammedbytheuser.They
7、offeranextremelygoodmethodofcollectingtheprocessdata,usingstandardizedinterfaces,andsubsequentlyperformingthenecessarymanipulationstoprovidetheinformationofinteresttotheprocessoperator.Thedataacquiredcanbeanalyze
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