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ID:9857994
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页数:16页
时间:2018-05-12
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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DateAcquisitionDateacquisitionsystemsareusedtoacquireprocessoperatingdataandstoreitonsecondarystoragedevicesforlateranalys
2、is.Manyofthedataacquisitionsystemsacquirethisdataatveryhighspeedsandverylittlecomputertimeislefttocarryoutanynecessary,ordesirable,datamanipulationsorreduction.Allthedataarestoredonsecondarystoragedevicesandmanipulatedsubsequentlytoderivethevariablesofinterest.Itisveryoftennec
3、essarytodesignspecialpurposedataacquisitionsystemsandinterfacestoacquirethehighspeedprocessdata.Thisspecialpurposedesigncanbeanexpensiveproposition.Powerfulmini-andmainframecomputersareusedtocombinethedataacquisitionwithotherfunctionssuchascomparisonsbetweentheactualoutputandt
4、hedesirableoutputvalues,andtothendecideonthecontrolactionwhichmustbetakentoensurethattheoutputvariablesliewithinpre-setlimits.Thecomputingpowerrequiredwilldependuponthetypeofprocesscontrolsystemimplemented.Softwarerequirementsforcarryingoutproportional,ratioorthreetermcontrolo
5、fprocessvariablesarerelativelytrivial,andmicrocomputerscanbeusedtoimplementsuchprocesscontrolsystems.Itwouldnotbepossibletousemanyofthecurrentlyavailablemicrocomputersfortheimplementationofhighspeedadaptivecontrolsystemswhichrequiretheuseofsuitableprocessmodelsandconsiderableo
6、n-linemanipulationofdata.Microcomputerbaseddataloggersareusedtocarryoutintermediatefunctionssuchasdataacquisitionatcomparativelylowspeeds,simplemathematicalmanipulationsofrawdataandsomeformsofdatareduction.Thefirstgenerationofdataloggers,withoutanyprogrammablecomputingfaciliti
7、es,wereusedsimplyforslowspeeddataacquisitionfromuptoonehundredchannels.Alltheacquireddatacouldbepunchedoutonpapertapeorprintedforsubsequentanalysis.Suchhardwireddataloggersarebeingreplacedbythenewgenerationofdataloggerswhichincorporatemicrocomputersandcanbeprogrammedbytheuser.
8、Theyofferanextremelygoodmethodofcollectingtheprocessdata,usin
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