Comportamento acustico de pavimentos nao-homogeneos de edificios a sons de impacto Modelo de simulacao

Abstract

This work presents a study concerning the evaluation of acoustic performance of non-homogeneous floors regarding structure-borne sound applied by the normalised tapping machine. A simulation model, based on two methods, to evaluate the performance referred to above, was developped and is presented. The methods are the modal approach and the statistical analysis energy. The first one is applied in the low frequency range of the spectra and the second in the complementary part of the global spectra (100 Hz to 5 kHz). To validate the model, several measurements and tests were made in laboratory conditions. In the same way, to verify the applicability of the model to "in situ" cases, a lot of tests were performed in field. The model also integrates the possibility to evaluate the improvement in acoustic performance provided by a set of floor screeds. A parametric analysis of the model was also done. It was performed on the parameters that can't be so well identified in pratice, such as the loss factors, the bending stiffness and the quality of the concrete. Finally, some conclusions, as well as specific proposals respecting the development of new studies in the near future, are presentedAvailable from Fundacao para a Ciencia e a Tecnologia, Servico de Informacao e Documentacao, Av. D. Carlos I, 126, 1200 Lisboa / FCT - Fundação para o Ciência e a TecnologiaSIGLEPTPortuga