Rolling noise model for building acoustics purposes
Regular paper
MATELYS
Tuesday 2 june, 2015, 17:40 - 18:00
Auditorium 2 (592)
Abstract:
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.