Accuracy assessment of planar near-field acoustical holography applied to non-resonant vibration imaging

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Samenvatting

A numerical study is presented on the accuracy of Planar Near-field Acoustical Holography (PNAH) for measuring non-resonant Vibration of plate-like structures. Lately the PNAH technique is applied to detect vibrations, but in most cases the measurement are limited to the investigation at resonance. However, in many practical situations the non-resonant behaviour of the structure is also important. Simulations are performed on a thin simply-supported baffled plate for which sufficient modes contribute to the Vibration by applying modal superposition. The distribution in modal contribution as well as the radiation frequency is varied. The acoustic pressure is calculated by means of the first Rayleigh integral, given the normal Vibration velocity over the surface of the plate. The reconstruction of the velocity is performed by the PNAH algorithm. From the numerical study, it is found that the accuracy of the reconstruction depends on the radiation efficiency of the modes and the distribution in the contribution of the single modes to the total Vibration.

Originele taal-2Engels
Pagina's2034-2041
Aantal pagina's8
StatusGepubliceerd - 1 jan 2013
Evenement20th International Congress on Sound and Vibration 2013, ICSV 2013 - Bangkok, Thailand
Duur: 7 jul 201311 jul 2013

Congres

Congres20th International Congress on Sound and Vibration 2013, ICSV 2013
LandThailand
StadBangkok
Periode7/07/1311/07/13

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