First International Conference on MOLDAVIAN RISKS – FROM ...

<strong>First</strong> <strong>International</strong> <strong>Conference</strong> on MOLDAVIAN RISKS - FROM GLOBAL TO LOCAL SCALE
16-19 May 2012, Bacau, Romania
EXPERIMENTING RIGID AND ELASTIC CLAMPING
METHODS OF ACOUSTIC SCREENS
Claudia Tomozei, Valentin Nedeff, Mirela Panainte, Gabriela Andrioai
“Vasile Alecsandri” University of Bacau, Department of Environmental Engeneering and
Mechanical Engeneering
Corresponding author: Tomozei Claudia, claudia.tomozei@ub.ro
Abstract: Noise transmission in enclosures can be controlled by treating the acoustic
enclosures in such a way as to limit inside and outside sound propagation. The industrial
noise can be controlled either by eliminating noise generating factors or by using
soundproofing materials to attenuate noise on propagation pathways. The attenuation of
acoustic wave propagation in industrial environments is a very important issue that may be
studied in different environments and may receive different solutions. One way to
attenuate sound pressure level/ SPL propagation is by using acoustic screens.
This article investigates two methods of noise reduction in industrial enclosures with the
help of acoustic screens which are composed of multiple walls. The results of the
experiments are charted and presented in the paper. The proposed method consisted in
using work variants that presuppose the rigid and elastic clamping of the walls to the
metallic frame.The rigid clamping was done by using screws to attach the walls to the
metal while the elastic one was done by attaching the walls to the metal with the help of
sanitary silicone.Acoustic screens were made of OSB (Oriented Strand Board), a material
available for use in both clamping modalities.The experiments were performed for two
types of wall positioning, a variant with three walls and cover and a variant with five walls
(cabin). The two variants were chosen because the number of walls was useful in
identifying the differences between the values of the sound pressure level for both types of
experiments.The results obtained at the end of the experiments showed better values for
the rigid clamping of walls, with a reduction in the sound pressure level of up to 3 dB.The
differences between the values of sound pressure level for the two types of clamping were
quite small, sometimes minor.
Key words: industrial noise, acoustic screen, rigid clamping, elastic clamping.
64