Avaliação de desempenho vibroacústico de unidades residenciais

Abstract

Impact noise has been a source of uncomfortable constants on the part of residential building users. In Brazil, the problem is still less widespread, being the object of much research and evolution. In this work, a theoretical and experimental vibroacoustic analysis of the impactnoise transmission between floors and walls of two adjacent residential units will be carried out. In the first stage experimental tests were performed. The tests were carried out in accordance with ISO 140-7 (1998), in order to obtain the sound insulation level of the floor / slab system of the room and the suite of two identical and superimposed apartments. Then, noise and vibration transmission tests were performed between several floors in order to evaluate the acoustic-vibration energy transmitted between the slabs and structural walls. For this purpose, a standard impact noise machine was used on the floor of the upper apartment, concomitant with the installation of microphones in reception rooms and fixation of accelerometers in the slabs of several rooms of the lower apartment. Finally, the vibrationsof floors and walls of the three adjacent room interfaces were measured, with the impact noise machine positioned on the ceiling of each room. The tested floors were classified according to NBR 15575-3 (2013) at pre-established performance levels. In a second step, a theoretical model was developed based on the Statistical Analysis of Energy method, which is an important tool to evaluate the vibroacoustic transmission between structural systems. Finally, new decision criteria were proposed for evaluating the degree of insulation of structural floors to impact noise through a probabilistic analysis of the measurement dataobtained with the experimental test. It is hoped that this study may contribute considerably to the quantification of structural noise, and consequent decision-making regarding the performance of structures related to vibration and acoustics