TITLE:
Acoustical Design of an Electrical Emergency Plant Using Sea Method
AUTHORS:
Evgeny Podzharov, José F. de la Mora Gálvez, Jesus A. Alvarez Sanchez
KEYWORDS:
Noise Reduction of an Elictric Plant; Statistical Energy Analysis; Transmission Loss; Spectral Analysis; Absoption of Noise
JOURNAL NAME:
Journal of Environmental Protection,
Vol.5 No.4,
March
25,
2014
ABSTRACT: The statistical energy analysis (SEA) was used in the acoustical design
of an electrical emergency plant to reduce the outdoor noise level. In the past,
when the plant was working, a high annoying noise was heard all over the university
camp. At a first glance the principal ways of noise propagation were the open
door of the plant which was used for the suction of fresh air and a vast hole
in the ceiling which was used for gases outlet. Also, a spectral analysis of
the noise inside the plant showed that the dominant frequencies of the noise
were in the range of 120 - 270 Hz. This frequency range is near the critical
frequency of the brick walls that is 129 Hz, at which the walls are transparent
for noise. A two-block diagram is used for the statistical energy analysis. Two
ways of sound transmission are considered through the inlet and outlet holes
and through the walls and ceiling. This analysis shows that the exclusion of
holes wouldn’t be sufficient to reduce noise to an acceptable level in a low
frequency range but increase the noise absorption by the wall coating material.
The transmission loss is calculated for different wall coatings and hole areas.
A layer of fiberglass of two-inch width is selected to increase the wall
absorption coefficient. Special silencers are designed and put at the suction
of air and at the outlet of engine gases to reduce the noise propagation
through the holes. The
noise measurement shows that the noise level is considerably reduced after
implementation of these measures. The reduction of noise is 7 - 8 dB (A), 19 dB
(A) and 23 dB (A), inside the plant, 10 m and 15 m away from the plant,
respectively.