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- Use of vibration measurements to determine the most suitable locations to improve sound insulation in buildingsPublication . Rosão, Vitor; Carreira, A. S.In the present work in situ sound insulation measurements were performed, according to the applicable standards of ISO 140 series, and vibration measurements of the separator elements in question (floor, ceiling, side walls). We intend to compare the results of direct measure-ments of sound insulation with the results of the predictions of sound insulation, based on the vibration measurements, to verify the feasibility of using vibration measurements to determine the most suitable locations of sound propagation (floor, ceiling, side walls) to act in order to improve, where it is needed, sound insulation in buildings. The principles of sound propaga-tion considered in EN 12354 series standards are used, e.g., 5 major structural paths, depend-ing on the sound radiating element in the receiver compartment [1) partition wall, 2) ceiling, 3) floor, 4) wall left side, 5) wall right side] and 2 major airborne path [1) openings in the par-tition element, 2) openings in other elements]. Different Radiation Factors, to convert vibra-tion of elements in sound are also considered, depending on the radiation element type and on the frequency in question.
- Análise comparativa de medições de vibração e de isolamento sonoro em edifíciosPublication . Rosão, Vitor; Carreira, A. S.No presente trabalho foram efetuadas medições de isolamento sonoro in situ, de acordo com as normas aplicáveis da série ISO 140, e medições de vibração dos elementos separadores em causa. Pretende-se comparar os resultados das medições diretas de isolamento sonoro com os resultados das previsões de isolamento sonoro, tendo por base as medições de vibração, de forma a verificar a viabilidade de aplicação desta metodologia na determinação mais rigorosa dos caminhos de propagação sonora entre espaços e da definição mais rigorosa, eficaz e direcionada das intervenções de melhoria de isolamento sonoro a efetuar, quando necessárias.
- Experimental test methodology to evaluate sound propagation paths between interior spaces of buildingsPublication . Gervásio, Nuno; Carreira, A. S.; Rosão, VitorWhen is detected in situ the existence of poor sound insulation, typically the non-compliance with the acoustic requirements of buildings, between two spaces – source and receiver - and if we want to solve the problem, it is necessary to know which sound paths most contribute to the difference of sound levels between these spaces. However, the classical sound insulation measurement does not make this distinction, it only provides the difference in sound levels. In order to overcome this difficulty, a new test methodology is proposed to estimate the sound propagation paths between building rooms, generated by sound sources located in the interior. The proposed methodology is based on the use of vibration measurements of structural elements (slabs) and non-structural elements (parti-tion walls) to estimate the sound field in the receiver space, together with sound measure-ments to estimate the sound field in the source space. With this alternative methodology to determine the sound insulation of a space, it is intended to obtain more rigorous results with respect to: i) determination of the contribution of each of the structural paths, in a certain sound isolation, in order to define the sound paths in which an acoustic rehabilita-tion intervention is most effective; ii) determining the possible existence of airborne paths that contribute to the reduction of sound insulation. In order to validate the proposed methodology, in situ sound insulation measurements were carried out, according to the applicable standards of ISO 16283 series, and vibration measurements of the separator el-ements (floor, ceiling, side walls) of interior spaces in existing buildings.
- Sobre a necessidade de consideração da componente vibração em projetos onde não é normalmente consideradaPublication . Rosão, Vitor; Carreira, A. S.As componentes que são normalmente consideradas nas Avaliações de Impacte Ambiental, para um determinado tipo de projeto, estão mais ou menos bem definidas. No caso da componente Vibração é usual a sua consideração em projetos manifestamente vibráteis, nomeadamente projetos ferroviários e pedreiras. Contudo existem outros tipos de projetos, em que não é usual a consideração da componente Vibração, mas em que os impactes ambientais associados podem não ser negligenciáveis, nomeadamente projetos rodoviários, aeroportuários e parques eólicos. O objetivo da presente comunicação é assim explicitar e demonstrar a pertinência e necessidade de consideração da componente Vibração em outros tipos de projetos, que não os habituais, recorrendo a resultados de medições in situ de vibração, para esses tipos de projeto, e à informação bibliográfica, nacional e internacional, disponível sobre a matéria.
- The validation of new vibration measurement to estimate sound propagation in buildings: study casesPublication . Gervásio, Nuno; Carreira, A. S.; Rosão, VitorThe main objective of the present work is the prediction of the paths of noise propagation between interior spaces of buildings, generated by internal sound sources, using an alternative experimental methodology. With this methodology, it is intended to obtain more rigorous results, with a certain solution of sound insulation, in relation to the contribution of each one of the sound paths, in comparison to the direct sound measurement. The proposed methodology is based on the use of a vibration measurement of the elements separating internal spaces (floor, ceiling, walls) to estimate the sound field in the receiver space, together with the sound measurements to estimate the sound field in the emitter space. The proposed method is validated through tests carried out on existing buildings in comparison with the results obtained from the classical measurement of acoustic insulation. The study cases were carried out for different types of constructive solutions and different types of buildings. The analysis of the study cases exposed the existence of an acceptable similarity between the results obtained through the two methodologies.