A small-scale test facility is described which enables manufacturers to assess the sound insulation of noise reduction treatments. Designed to provide a cheap and quick alternative to standard test methods, the technique uses sound intensity to measure the insertion loss of noise reduction treatments when subjected to airborne noise.
Get full access to this article
View all access options for this article.
References
1.
GahlauH. K.Fortschrittliche Schallisolaten in der Automobiltechnik. Proceedings of Polyurethanes World Congress, 1987, pp. 712–726.
2.
BS 2750 Methods of sound insulation in buildings and of building elements (British Standards Institution, London).
LingM. K.HilyardN. C.HengR. B. W.Performance of polyurethane cored composites for vehicle interior noise control. Proc. Inst. Acoust., 1990, 12(1), 307–316.
5.
WallaceR. L.DienelH. F.BeranekL. L.31st Meeting of the Acoustical Society of America. J. Acoust. Soc. Am., 1946, 18, 246 (abstract only).
BeranekL. L.WorkG. A.Sound transmission through multiple structures containing flexible blankets. J. Acoust. Soc. Am., 1949, 21, 419–428.
8.
BeranekL. L., (Ed.) Noise and vibration control, 1988 (Institute of Noise Control Engineering).
9.
Sound intensity, 1986 (Bruel and Kjaer, DK 2850 Nærurn, Denmark).
10.
McGaryM. C.Separation of airborne and structure-borne noise radiated by plates constructed of conventional and composite materials with applications for the prediction of interior noise paths in propeller driven aircraft. PhD dissertation, Department of Aeronautics and Astronautics, Stanford University, 1986.
11.
ANSI S12.21 Engineering method for the determination of sound power levels of noise sources using sound intensity.
12.
ISO 9614–1 Acoustics-determination of sound power levels of noise sources using sound intensity—part 1: measurement at discrete points, 1990 (International Standardization Organization).
