Vibroacoustic vharacterization using nearfield acoustic holography / Caracterização vibroacustica usando holografia acustica de campo proximo

AUTOR(ES)
DATA DE PUBLICAÇÃO

1999

RESUMO

In this work, the Nearfield Acoustic Holography technique - NAH was explored as an way to analyze vibroacoustic problems. Holography is a process that allows to determine acoustic fields characteristics using a Discrete Fourier Transform - DFT, from a regular grid of measurements obtained in an acoustic environment for which the Green s function is known. This work presents a brief principle s review of this technique with an application on the reconstruction of the vibroacoustic properties of structures. The pressure field, particle velocity field and acoustical intensity generated by a vibrating structural element were reconstructed through the NAH technique in different spatial positions. ln order to minimize spatial leakage problems from signal processing a Regressive Discrete Fourier Series - RDFS was utilized as an alternative to windowing techniques. Results obtained from a plate type structure were analyzed, validated and compared with theoretical predictions

ASSUNTO(S)

vibração nearfield acoustic holography fourier structural vibrations transformações de acoustic holography vibroacoustic holografia acustica fourier series de

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