msameasurementsystemanalysis(已修改)
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【正文】 1Measurement System Analysis(MSA)QualitySatisfyShanghaiJuly2023TopicBasicconceptofmeasurementSystemAnalysisMeasurementSystemAnalysisApplicationDeterminationAttributemeasurementsystemanalysisQAJuly2023Shanghai MSA23Some basically concept for MSAShanghaiJuly2023 ? Measurement? MeasurementTools? MeasurementSystemJuly2023Shanghai MSA4n Bias:Differencebetweenmeanofallmeasurementsandthereferencevalue.Referencevaluecanbesetupbythemeanofmeasurementswithahigherqualitymeasurementsystem.July2023Shanghai MSA5DifferentmeanvaluesshowsdifferentresultsAnalysis for systematic failure: ? BiasduetoOPERATER:Differentpersongetdifferentresults.? BiasduetoEQUIPMENT:Differentequipmentsshowsdifferentresults.July2023Shanghai MSA6l Stability:Variationofameasuringsystembymeasuringthesamefeatureoveraperiodoftime.July2023Shanghai MSA7? Linearity:Differencebetweenthemeasuredvalueandthereferencevaluewhenusingonemeasurementinstrumentovertheexpectedcharacteristicprocesswindow.July2023Shanghai MSA8? Repeatability:Variationofthemeasurementresults,ifthesameoperatorismeasuringthesamepart(s)severaltimes.July2023Shanghai MSA9? Reproducibility:Variationofthemeansofthemeasurementresults,ifdifferentoperatorsmeasurethesamepart(s)withthethesamemeasurementequipmentseveraltimes.July2023Shanghai MSA10Gage RR (repeatability and reproducibility)：Applied in total measurement systemVariableAttributeJuly2023Shanghai MSA1112Measurement System AnalysisApplication DeterminationShanghaiJuly2023When to use itlQualificationfortheequipmentlComparisonbetweendifferentequipmentslConfirmationforthesuspiciousequipmentlComparisonoftheequipmentbeforeandafterfixingitlChangethemainpartsontheequipmentlClassifythemeasurementequipmentlNewproductspecificationJuly2023Shanghai MSA13Obtainasampleandestablishitsreferencevaluerelativetoatraceablestandard.Haveasingleappraisermeasurethesamplen=10timesinthenormalmanner.Computetheaverageofthenreadings.Bias = average – reference valueIndependentSampleMethodJuly2023Shanghai MSA14Computetherepeatabilitystandarddeviationwhered2*istakenfromAppendix，numberofsubgroups(g)＝＝ 1，subgroupsize(m)＝＝ nDeterminethetstatisticforthebias:Biasisacceptableatthealevelifzerofallswithinthe1aconfidenceboundsaroundthebiasvalue:WheretistakenfromAppendixJuly2023Shanghai MSA15案例Referencevalue＝Bias1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 nMeasuredvalue 15 ReferenceValue＝ ,a=,g=1,d2*=TStatistic df Significanttvalue(2tailed)Bias95%ConfidenceintervaloftheBiasLower UpperMeasuredValue Conclusion:Sincezerofallswithintheconfidenceintervalofthebias(,),theengineercanassumethatthemeasurementbiasisacceptableassumingthattheactualusewillnotintroduceadditionalsourceofvariation.July2023Shanghai MSA16July2023Shanghai MSA17FillJuly2023Shanghai MSA18July2023Shanghai MSA19July2023Shanghai MSA20Analysis of Bias studyIfthebiasisstatisticallynonzero,lookforthesepossiblecauses:? Errorinmasterorreferencevalue.Checkmasterprocedure.? Worninstrument.Thiscanshowupinthestabilityanalysisandwillsuggestthemaintenanceorrefurbishmentschedule.? Instrumentmadetowrongdimension.? Instrumentmeasuringthewrongcharacteristic.? Instrumentnotcalibratedproperly.Reviewcalibrationprocedure.? Instrumentusedimproperlybyappraiser,Reviewmeasurementinstructions.? Instrumentcorrectionalgorithmincorrect.July2023Shanghai MSA21The system remended Method:?Onesampletosetupreferencevalue?Testthestandard3to5timesperiodically(daily,weekly)?DoXbarorXSchartwithtime?Computethecontrolrange,evaluatethefailureandunstability?ComputetheSTD,parewiththedeviationintheprocesstoevaluatethestabilityofthemeasurementsystemJuly2023Shanghai MSA22Judge according to the chartsOut of control Regulation1.Onepointoutofcontrolrange2.Continual9pointonthesamesideofthereferencevalue3.Continual6pointascendordescend
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