Acoustical Design of an Electrical Emergency Plant Using Sea Method

Evgeny Podzharov, José F. de la Mora Gálvez, Jesus A. Alvarez Sanchez

Electromechanical Engineering Department, University of Guadalajara, Puerta 10, Guadalajara, México.
Superior School of Engineering Prolongacion Calz, University of Panamericana, Circunv. Pte 49, Guadalajara, México.

DOI: 10.4236/jep.2014.54035                

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.

Keywords

Noise Reduction of an Elictric Plant; Statistical Energy Analysis; Transmission Loss; Spectral Analysis; Absoption of Noise

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Lion, R. (1975) Statistical Energy Analysis. Theory and Applications. The MIT Press, Cambridge and London.
[2]	Leo, L. and Beranek, I.L.V. (1992) Noise and Vibration Control Engineering. Principles and Application. Wiley & Sons, Inc., New York.
[3]	Cyril, M.H. (1995) Manual de Medidas Acústicas y Control del Ruido. Tercera Edición. McGraw-Hill, New York.
[4]	Faulkner, L.L. (1975) Handbook of Industrial Noise Control. Industrial Press Inc., South Norwalk.
[5]	Lewis, H.B. and Douglas, H.B. (1994) Industrial Noise Control. Fundamentals and Applications. 2nd Edition. Marcel Dekker, Inc., New York.