Abstrakt
This paper describes the development phases of a numerical-experimental
integrated approach aimed at obtaining sufficiently accurate predictions
of the noise field emitted by an external gear pump by means 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 experimentally acquired only in
some positions of a 8.5 cc/rev external gear pump casing for some working
conditions and considered as external excitation boundary conditions for a
FE quite simplified vibroacoustic model. The emitted noise field was
computed considering the pump as a ‘black box’, without taking into
account the complex dynamics of the gear tooth meshing process and the
consequent fluid pressure and load distribution. Sound power tests, based
on sound intensity measurements, as well as sound pressure measurements in
some positions around the pump casing were performed for validation
purposes. The comparisons between numerical and experimental results
confirmed the potentiality of this approach in offering a good compromise
between noise prediction accuracy and reduction of experimental and
modelling requirements.
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