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Measurement of the spatial sound propagation with a low-cost sound intensity scanner

: Klaus, T.B.; Schmidt, M.; Herold, S.

Kropp, W. ; Deutsche Gesellschaft für Akustik -DEGA-, Berlin:
45th International Congress and Exposition on Noise Control Engineering, Inter-Noise 2016 : Towards a quieter future; August 21 - 24, 2016, Hamburg, Proceedings
Berlin: DEGA, 2016
ISBN: 978-3-939296-11-9
International Congress and Exposition on Noise Control Engineering (Inter-Noise) <45, 2016, Hamburg>
Fraunhofer LBF ()

Sound waves are compression oscillations propagating in an acoustic fluid. The fluid possesses kinetic energy by means of volume flows and potential energy in terms of pressure. These entities are characterized due to the physical dimension of the sound intensity. Hereby, the acoustic radiation of noise sources such as vibrating structures can be described. As the sound intensity is a vectorial dimension it is possible to describe the magnitude of the radiation in terms of the sound-pressure or power and the direction of propagation by the power fluxes. Acquiring the three dimensional sound intensity in a spatial domain is a time- and cost-intensive procedure, based on the state-of-the-art measurement equipment. By this means a low-cost setup is introduced, consisting of the three dimensional sound-intensity-probe and the positioning unit. Hereby, the automated characterization of noise sources and the identification of acoustic hot spots are possible. The probe is implemented by means of electret capsules. Furthermore, the step-motor driven positioning unit is controlled by an Arduino DSP board. The system is compared to standard methods for the estimation of the sound-power and an alternative pu-sound intensity probe, with respect to correction factors improving system inherent errors of pp-probes.