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DRAFT:TirenoisemeasurementspecificationVWGroup
1.Purpose
1.1.Thistestprocedurespecifiesaprocedurewithwhichtheoveralltirenoise(consistingoftirerolling
noiseandaccelerationinfluence)canbeassessedonadefinedroadsurface.Thistestofthetire
componentisnecessaryinordertobeabletoevaluateandlimitthecontributionofthiscomponentto
theoverallvehicleduringthetypetestoftheexteriornoise.
1.2.Duetoexpectedfurtherreductionsinoverallvehiclenoiseemissions,tirenoisewillbecomethe
dominantsourceofoverallvehiclenoise.Thisresultsintheneedforearlyanddetailedknowledgeof
tirenoise.
1.3.Theassessmentcriteriaare:
-Thepass-bynoiseaccordingtoUNR51.03(measurementmethodforvehiclesofcategoryM1,N1
andM2withupto3,500kggrossvehicleweight),aswellasthedraftofUNR51.04
-Rollingnoiseinthespeedrangeoftheabove-mentionedpass-bymeasurements(20to100km/h)
2.Areaofapplication
2.1.Thistestmethodisvalidfordevelopmentmeasurementsaswellasreleasetestsand
seriesmonitoringoftires.
2.2.ThemeasurementsarecarriedoutbytheCompleteVehicleAcousticsdepartmentorbya
serviceproviderorsuppliercommissionedbythisdepartment.
2.3.Theexactscopeofmeasurementisagreedbetweentherespectivepartiesinvolvedintheorder.
3.Definitionofterms
3.1.Tiretester
Thetiretesterisavehiclethatisdesignedtomeasuretires.Ideally,itissoquietthattheresultsofthe
tiremeasurementsarenotaffected.
3.2.Vehicleresidualnoise
Theresidual
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