Vibroacoustic Measurementsand SimulationsApplied toExternal Gear Pumps.An IntegratedSimplied Approach

This paper describes thedevelopmentphases of a numerical-experimental integrated approach aimed atobtainingsucientlyaccuratepredictionsofthenoiseeldemittedbyanexternalgearpumpbymeans of some vibration measurements on its external casing. Harmonic response methods and vibroacoustic analyses were considered as the main tools of this methodology. FFT acceleration spectra were exper- imentally acquired only in some positions of a 8.5 cc/rev external gear pump casing for some working conditions and considered as external excitation boundaryconditions for a FE quite simplied vibroa- coustic model. The emitted noiseeld was computed considering the pump as ablack box', without taking into account the complex dynamics of the gear tooth meshing process and the consequentuid pressure and load distribution. Sound power tests, based onsound intensity measurements, as well as sound pressure measurements in some positions around the pump casing were performed for validation purposes.Thecomparisonsbetweennumericalandexperimentalresultsconrmedthepotentialityofthis approachinoeringagoodcompromisebetweennoisepredictionaccuracyandreductionofexperimental andmodelling requirements.

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