数字电子秤的设计与实现 外文文献及翻译Word格式.docx
- 文档编号:21216148
- 上传时间:2023-01-28
- 格式:DOCX
- 页数:7
- 大小:21.47KB
数字电子秤的设计与实现 外文文献及翻译Word格式.docx
《数字电子秤的设计与实现 外文文献及翻译Word格式.docx》由会员分享,可在线阅读,更多相关《数字电子秤的设计与实现 外文文献及翻译Word格式.docx(7页珍藏版)》请在冰豆网上搜索。
Abstract:
Inordertosolvetheweightproblemoftenencounteredinmeasuringthelow-massobjectsinthetradeanddailylifeofthemodernbusiness,thedesignofanewpocket-sizedelectronicscales.Thispocket-sizedelectronicscalesForceSensorgravitysignalsintoelectricalsignalstomeasure,andmeasuringtheresultsofthedigitaldisplay.Thepocket-sizedelectronicscaleswithasmallsize,lightweight,easytocarry,intuitivedisplay,measurementandhighprecision;
complexstructure,thecostdisadvantages.Thisarticlefocusesontheloadcellworks,errorcompensation,themainparametersofselection.Andthetechnicalandeconomicanalysis.
Keywords:
pocket-sizedelectronicscales;
weighing;
sensor;
errorcompensationCLC
1AneedsanalysisInmoderncommerceandtradeandeverydaylife,oftenencountertheproblemofmeasuringtheweightofthelow-massobjects.Althoughthetraditionalsteelyardcansolvethisproblem,butinconvenienttocarry,theefficiencyisnothigh,thedisplayisnotintuitiveandlowmeasurementaccuracy;
mechanicalspringbalancecansolvethisproblem,buttheinertiainherentlowfrequency,highsensitivity,measurementaccuracyisnothigh.Withtheprogressandupdateofthemicro-computertechnology,integratedcircuittechnology,sensortechnology,electronicscalesrapiddevelopment,ithasaresponsive,highaccuracy,fullyfunctional,thedisplayisintuitive,
1
compact,easytouseandsoon.
Forthesereasons,inordertosolvethelow-massobjectsweighingproblem,ifasmallsize,lightweight,portable,digitaldisplayelectronicscales,willbepopular.Discussedbelow,thatis,thescopeofaweighing5kgcompactelectronicscales.
2DesignTheprincipleofthestructureofthepocket-sizedelectronicscalesshowninFigure1.Themaintaskistodesigncompactelectronicscalesweighingthechoiceoftheforcesensors.Dynamometersensortypestoachievetheweighinganddigitaldisplay,thekeyistowanttoforce(gravity)signalsintoelectricalsignalstomeasuremethodismainlydividedintotwocategories:
oneisthedirectmethod,namelytheuseofpressuremagneticsensor,piezoelectricsensor,Piezoresistivesensorsdirectlytotheforcesignalconvertedintoelectricalsignals;
theotheristheindirectmethod,theelasticelementasthesensorwillpull,pressurechangesinstrain,displacement,orfrequency,andthenstrainsensors,displacementsensors,orfrequencysensorstrain,displacementorfrequencychangesforpower.Comprehensivecomparisonofavarietyofsensors,usetheindirectmethodofstraingaugeforcetransducer.Pocket-sizedelectronicscalestructuralprinciple:
Sensor?
amplifier?
CPU?
display?
ADconverter
3Theworkingprincipleofthestraingaugeforcetransducerstraingaugepastedintoforce,force-sensitiveelasticelement,thecorrespondingstrainwhentheelasticelementforcedeformation,thestraingaugeintoaresistancechange,whichledtothevoltagemeasuringcircuitchangesbymeasuringtheoutputvoltagevalue,andthenthroughtheconversioncanbeobtainedbythemeasurementofbodyweight.Sincethepocket-sizedelectronicscalesrequiresmallsize,weighinginscope,precisionandangleevenconsistency,sensoranddisplayintegration,itisselectedparalleltothetwoholescantileverbeamstraingaugeload-bearingsensor.Itscharacteristicsare:
highprecision,
2
easeofprocessing,simpleandcompactstructure,strongresistancetopartialload,highnaturalfrequency.Straingaugechoiceofametalpalisademetalmooringpasteontheinsulatingsubstrateparkedstraingages,mechanicalstrainresistancestraingaugefeelingsgenerally10-10-2mm,theresistancerateofchangeoftheattendantabout10-610-2ordersofmagnitude,suchasmallchangeinresistancemeasuredusingthegeneralresistanceoftheinstrumentishardtomeasureout,youmustusesomeformofmeasurement.
Circuitintosmallchangesinresistanceratestochangesinvoltageorcurrent,inordertosecondaryinstrumentdisplay.Bridgemeasurementcircuittomeetthisrequirement.Intheloadcell,R1,R2,R3,R4straingaugeresistorbridgemeasurementcircuitshowninFigure3.Rmisthetemperaturecompensationresistor,eistheexcitationvoltage,Vistheoutputvoltage.
参考二:
Theloadcellisaqualitysignalintoameasurableelectricalsignaloutputdevice.MustconsidertheactualworkingenvironmentofthesensorwhichsensorYin,thisisessentialforthecorrectselectionoftheloadcell,anditisrelatedtothesensorcanworkaswellasitssafetyandservicelife,andthewholeweighingthereliabilityandsafetysex.Onthebasicconceptsandmethodsofevaluationofthemajortechnicalindicatorsoftheloadcell,thenewandoldGBqualitativedifferences.
Thetraditionalconcept,theloadsensorweighingsensors,forcesensors,collectivelyreferredtousingasingleparametertoevaluateitsmeasurementproperties.OldGBwillbecompletelydifferentapplicationobjectsandtheuseofenvironmentalconditions"
weighing"
and"
measuredforce"
twosensorsintoonetoconsider,notgivento
3
distinguishbetweenthetestandevaluationmethods.OldGBtotalof21indicators,weretestedatroomtemperature;
andnon-linearity,hysteresiserror,repeatabilityerror,creep,theadditionalerrorofthezerotemperatureandthemaximumerrorinthesixindicatorsoftheratedoutputadditionaltemperatureerror,todeterminesaidThelevelofaccuracyoftheweightsensor,respectively0.02,0.03,0.05said.
Proportiontoconverttheoutputsignalcanbemeasured.Takingintoaccountthedifferentplaceofuseoftheaccelerationduetogravityandairbuoyancyontheconversion,themainperformanceindicatorsoftheloadcelllinearityerror,hysteresiserror,repeatabilityerror,creep,zero-temperaturecharacteristicsandtemperaturesensitivitycharacteristics.Inavarietyofweighingandmeasuringthequalityofthesystem,usuallytheintegratederroraccuracyoftheintegratedcontrolsensors,andintegratederrorbandorscaleerrorbandlinkedsothatselectioncorrespondstoacertainaccuracyweighingweighingsensors.InternationalOrganizationofLegalMetrology(OIML)requirements,sensorerrorwithtotalweighinginstrumenterrorδwithΔof70%oftheloadcelllinearityerror,hysteresiserrorwithinthespecifiedtemperaturerangeduetotheeffectoftemperatureonthesensitivityoftheerrorthesumcannotexceedtheerrorbandofδ.Thisallowsthemanufacturerofthecomponentsthatmakeupthetotalmeasurementerroradjustmenttoobtainthedesiredaccuracy.
Theloadcellconversionmethodisdividedintophotoelectric,hydraulic,electromagneticforcetype,capacitive,magneticpoleschangetheformofvibratorygyroscopeceremony,resistancestraintype,tothemostextensiveuseofresistancestrain.
ElectromagneticforcesensorIt
ElectromagneticforcesensorItusesaload-bearingstageloadandtheprincipleofelectromagneticforceEquilibrium(Figure5).Puttheloadingstage,themeasuredobjectatoneendoftheleverupwardtilt;
photoelectricdetectthetiltsignal,amplifiedintothe
4
coil,theelectromagneticforce,sothatthelevertoreturntoequilibrium.Currentsproduceelectromagneticcounterweightdigitalconverter,youcandeterminethequalityofthemeasuredobject.Theelectromagneticforcesensoraccuracy,upto1/2000~1/60000,buttheweighingrangeisonlytensofmgto10kg.
CapacitivesensorsIt
Capacitoroscillatorcircuitoftheoscillationfrequencyandtheplatespacingdisdirectlyproportionalrelationshipbetweenthework.Therearetwoplates,onefixedandtheotheronecanmove.Bearingloadmeasuredobject,theleafspringdeflection,thedistancebetweenthetwoplateschanges,theoscillationfrequencyofthecircuitalsochanges.Themeasuredfrequencychangecanbecalculatedtothequalityoftheload-bearingstage,themeasuredobject.Capacitivesensorpowerconsumption,lowcost,accuracyof1/200to1/500.
PolechangetheformofsensorFerromagnetic
componentsinthemeasuredobjectgravityundermechanicaldeformation,internalstressandcausechangesinpermeability,andalsochangessothattheinducedvoltageofthesecondarycoilwoundonbothsidesoftheferromagneticcomponent(pole).Measurethevoltagevariationcanbecalculatedaddedtotheforceonthepole,andthendeterminethequalityofthemeasuredobject.Poletochangetheformofsensoraccuracyisnothigh,usually1/100,applicabletothelargetonnageweighing,weighingrangingfromtenstotensofthousandsofkilograms.
VibrationsensorTheforceoftheelasticelement,thenaturalvibrationfrequencyoftheforceisproportionaltothesquarerootof.Measurethenaturalfrequencychanges,youcanfindthemeasuredobjectroleintheelasticcomponentoftheforce,andthencalculatethequality.Thevibrationsensorvibratingwireandtuningfork.Theelasticcomponentofthevibratingwiresensorstringwire.Whentheload-bearingstage,plusthe
5
measuredobject,theintersectionoftheV-shapedstringwireispulleddown,andleftstringsoftensionincreases,therightstringtensiondecreases.Thenaturalfrequencyofthetwostringsofdifferentchanges.Calculatethefrequencydifferencebetweenthetwostrings,youcanfindthequalityofthemeasuredobject.Thehighertheaccuracyofthevibratingwiresensor,upto1/1000~1/10000,weighing100gtohundredsofkilograms,butthestructureiscomplexanddifficultprocess,andhighcost.
Theelasticcomponentofthetuningforksensorisatuningfork.Fixedtuningforken
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 数字电子秤的设计与实现 外文文献及翻译 数字 电子秤 设计 实现 外文 文献 翻译
![提示](https://static.bdocx.com/images/bang_tan.gif)