Rolling noise model for building acoustics purposes
Tuesday 2 june, 2015, 17:40 - 18:00
Auditorium 2 (592)
For the last 10 years, a change has been observed in the usage and the typology of small-rise buildings in urban areas. For this type of buildings, ground floors are now aimed for commercial surfaces like proximity supermarkets. This new usage has revealed critical disturbances due to the noise of the trolleys delivering these shops at time where the buildings are mostly occupied. Rolling trolleys indeed generate low frequency vibrations (below 100 Hz) in the concrete slab of the ground floor which propagate easily in the entire building structure and radiate sound in the upper floors. The energy content of these vibrations is quite different from that observed for the tapping machine, the Japanese ball or even a walking sound. Therefore, the treatment of this source requires dedicated experimental methods and modeling tools. In this context, the present communication briefly examines the collecting of experimental data and presents more extensively an original model for rolling noise in buildings. The developed model is able to account for the ground surface roughness as well as the rolling wheel asperity profile. It also allows to consider the mechanical impedance of the ground including some possible flooring noise treatment. It is shown that the model is able to reproduce correctly the measured level of vibrations and measured noise levels. It is also proved to predict accurately the sensitivity to different types of rolling noise and floorings having various properties, based on a single layer or a multi-layer construction.
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