MAPPING OF RADIANT REGIONS IN VIBRATING RECTANGULAR PLATES WITH DIFFERENT BOUNDARY CONDITIONS THROUGH THE SUPERSONIC AND USEFUL INTENSITIES

Authors

  • Vera Lúcia Duarte Ferreira Universidade Federal do Pampa
  • Roberto Aizik Tenenbaum Universidade do Estado do Rio de Janeiro, Instituto Politécnico
  • Filipe Otsuka Taminato Universidade do Estado do Rio de Janeiro, Instituto Politécnico

Abstract

This work investigates the acoustical intensity generated by the sound radiated from rectangular plates in four cases with distinct combinations of classical boundary conditions. The objective is to identify the regions of these plates that effectively contribute to the radiated sound power into the far-field, especially when the driven frequency occurs below the critical coincidence frequency. This identification is done by filtering the non-propagating waves, both using the (analytical) supersonic intensity method and the (numerical) useful intensity model. Brief theoretical formulations, both for the plates vibration and the resulting acoustical field, are discussed. The closed form solution of the normal velocity field for the four cases is given. Then, the supersonic intensity is estimated. In the numerical examples, the comparison of the supersonic intensity, the useful intensity and the classical acoustic intensity is shown.

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Author Biographies

Vera Lúcia Duarte Ferreira, Universidade Federal do Pampa

Roberto Aizik Tenenbaum, Universidade do Estado do Rio de Janeiro, Instituto Politécnico

Filipe Otsuka Taminato, Universidade do Estado do Rio de Janeiro, Instituto Politécnico

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Published

2016-11-21

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Artigos