GMN 5242TP-2000 VEHICLE BRAKE SQUEAL TEST PROCEDURE

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1、Revision1.3RevisionDate:11/27/00BSL-042VEHICLEBRAKESQUEALTESTPROCEDURE1.INTRODUCTION1.1.PurposeToobjectivelyquantifyvehiclebrakenoiseperformance.1.2.ForwardThisprocedureisintendedtoquantifybrakesquealfrequenciesandamplitudesaswellastheoperatingconditionsunderwhichthebrakesqueal(s)

2、occurs.Thisprocedureisintendedtocapturebrakesquealinthefrequencyrangeof2to18kHz.1.3.ApplicabilityThisprocedureisapplicabletoallpassengercarandlighttruckbrakecorners.1.4.Definitions1.4.1.ParkingLotManeuver(PLM).Abrakestopfrom8kphatadecelerationrateof0.10g.1.4.2.FlatTrackTestSchedul

3、eAsequenceofbrakestopsperformedontheMPGOvalTrack.TheprocedurecanbeseeninAttachment1.1.4.3.ColdTestScheduleAscheduletosimulatecoldweatherconditions.Thevehicleisallowedtosoakinacoldboxforfourhoursat1°C.Afterthissoakperiod,severalPLM’sareperformedinforwardandreverse.1.4.4.WetTestSche

4、duleAscheduletosimulatewetweatherconditions.Thevehicleisdriventhroughthe50footsplashtroughandthenseveralPLM’sareperformed.1.4.5.BrakeBurnishSchedule200stopspertheFMVSS135burnishscheduleinAttachment2.2.RESOURCES2.1.FacilityGMCONFIDENTIALRevision1.3RevisionDate:11/27/00MilfordProvin

5、gGroundOvaltesttrackorequivalenttestfacilityshallbeused.MilfordProvingGroundColdBoxorequivalenttestfacilityshallbeused.MilfordProvingGroundSplashTrough(50ft)orequivalenttestfacilityshallbeused.2.2.Equipment2.2.1.ARoushBrakeDAQ_measurementsystemorequivalent2.2.2.TwoEndevcopressuret

6、ransducersorequivalent2.2.3.FourK-typethermocouples2.2.4.SpeedMeasurementDevice(Optional)2.2.5.Productionrepresentativebrakecornerhardware2.2.6.Thefollowingmeasurementsshallbemadeanddigitallyrecordedat100Hz:·speed(kph)(optional)·soundpressurelevel(dB)·corneracceleration(g)·brakeap

7、plypressure(kPa)·brakeliningtemperature(C)·ambienttemperature(C)·humidity2.3.PersonnelSkills3.Procedure3.1.Preparation3.1.1.Newbrakehardware(liningsandrotors/drums)shouldbeinstalled.3.1.2.ThermocouplebrakeliningsperFMVSS105.3.1.3.Installtransducersanddataacquisitionequipment.Thein

8、teriormicrophoneshouldbeplacednea