英语翻译

2.2.AEsourceduringgearmeshing

UnderstandingthesourceofAEactivityatthegearmeshisafundamentalpre-requisiteifthistechniqueis

tobesuccessfullyemployedforgeardiagnosticsandprognostics.Toutountzakis[11]highlightedlimitationsin

thecurrentunderstandingofthesourcemechanismofAEduringgearmeshing.Tanetal.[17]ascertainedthe

AEsourcemechanismthroughaseriesofexperimentalprogrammes.Theseexperimentalprogrammes

consistedofisothermaltestsonundamagedgearstoexploretheeffectsofrotationalspeedandappliedtorque

onAElevels.Fromtheisothermaltestresults,itwasobservedthatvariationoftheappliedtorquehada

negligibleeffectontheAErootmeansquare(rms)levels,similartothenegligibleeffectofloadonfilm

thicknessunderelastohydrodynamiclubrication(EHL)ofnon-conformingmatingsurfaces.Italsonotedthat

thevariationinrotationspeedhadamorepronouncedeffectonAErmslevelsrelativetotheload.Tanetal.

[17,29]concludedthatthesourceofAEduringgearmeshwasasperitycontactunderrollingandslidingofthe

meshinggearteethsurfaces.TheseobservationsdetailedbyTanetal.[17,29]wereunderisothermal

conditions.Inconditionsotherthanisothermal,anincreaseinspeedandloadwillresultinincreasedAE

levels[26].

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C.K.Tanetal./MechanicalSystemsandSignalProcessing21(2007)208–233209

2.3.Vibrationcharacteristicsandgeardamage

Yesilyurtetal.[18]utilisedthevibrationanalysistechniquefordamagedetectionandassessment,andstated

thatgeartoothdamagewouldcauseareductionintoothstiffnessandtheextentofthisdamagecouldbe

monitored.Yesilyurtconcludedthatfordistributeddamageconditionthereductionoftoothstiffnessandloss

ofgeartoothinvoluteprofilecontributetotheincreaseinvibration.However,inthecaseoflocaliseddefect,

toothstiffnessreductionwasthesolecontributortotheincreaseinvibrationlevels.Choyetal.[19]cametoa

similarconclusion.Drosjacketal.[20]presented