NEMA MG 3:1974 (R2006)
NEMA MG 3:1974 (R2006) Sound Level Prediction For Installed Rotating Electrical Machines Provides a method for estimating sound pressure levels of installed rotating electrical machines.
Table of Contents
ForewordSection1ABBREVIATIONS
Section2DEFINITIONSOFTERMS
Section3STEPSREQUIREDTODETERMINESOUNDLEVELS
Outline
DefiningtheExampleUsedintheText
RoomConstant
MeasuredwithaSoundSourceofUnspecified
SoundPowerLevel
ComputedfromArchitecturalMaterials
MeasuredwithaSpecifiedWhiteSoundSource
SoundPressureLevelataDesiredPointDuetoEach
SoundSource
MachineRatedinSoundPowerLevel(Lw)
MachineRatedinSoundPressureLevel(Lp)
ataSpecifiedDistanceforaRoomConstant
ofR=infinity
MachineRatedinSoundPressureLevelata
SpecifiedDistanceforaRoomConstantofR=R[1]
CombiningSoundPressureLevelsataPointDueto
SeveralSources
TheEffectofAmbientSoundPressureLevel
ConcludingComments
AppendixAdditionalDataRequiredWhenUsingOctaveBand
CenterFrequenciestoDetermineSoundPressure
Levels
References