QUALIFICAÇÃO DE CÂMARA REVERBERANTE DE ABSORÇÃO E VALIDAÇÃO DE MODELO COMPUTACIONAL

Abstract

The acoustic quality of environments directly influences the activities developments in the place and the proper specification of the materials of finishing and internal coatings can solve several problems related to lack of intelligibility in internal environments. The construction materials industry has shown a greater concern with the quality of its products so for this purpose they meet the minimum stated in the norms, bringing more comfort to the people in general. In this sense, it can be pointed out that the lack of acoustic quality of the buildings has been studied more deeply, such as academics research and market opportunity, since the precarious conditioning of the environments, as well as the specification and misuse of materials, can affect the physical and psychological health of the user. To solve these problems, acoustic laboratory tests are essential for the adequate characterization of the materials, with the reduction of sound levels and the consequent increase of the user satisfaction in these places. In addition to the laboratory tests, there are still software’s that offer a faster way to verify the space acoustic conditioning. This way, acoustic laboratories need their rooms to be qualified for determining the absorption coefficients of the materials to be used indoors. This work presents the recording of the qualification process of the Unisinos, Itt Performance reverberant room for tests to determine the material absorption coefficient. This test proceeds through the standard’s description, which dictates the steps to be followed, the test is conduct by the method interrupted noise. The qualification consists of the gradual installation of diffusers with the accompaniment of the stability of the reverberation time in the reverberant room. The study involved measurements of reverberation time in the chamber and computer simulation with Catt Acoustic software, v09. Comparisons were made from the results of the experimental tests in the laboratory, according to ISO 354, and the computer simulations models for the validation of the digital model, from the comparison of reverberation time and sound absorption coefficient and sound dissipation by the room with standard sample and no standard sample. In addition, sound dispersion studies were performed for different wavelengths, in thirdoctave bands between 100 Hz and 5 kHz, through repetitive tests, designating the total area required for diffusers that was an area of 15 square meters. It was concluded with the research that that the comparison was satisfactory and that without the sample or with sample the maximum difference of variation in reverberation time was reached in 9.02%.