In a companion paper. Impulse Response Analysis methods were developed as a practical method of measuring the sound insulation of panels, both as partitions and as solid screens and a method for comparing the results with the standard method of measurement for transmission loss, ISO 140, was demonstrated. In this paper studies are presented on the application of the method to more complex open forms of screen. A prediction model has been used for the simpler form of screen, which shows good agreement with measurements. For the more complicated screens, which provide greater sound insulation, the results are compared with standard ISO 140 measurements.
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References
1.
LyonsR.GibbsB.M., “Impulse Response Analysis: An alternative method of measuring sound insulation”, accepted for publication in Building Acoustics, Aug. 1997.
2.
ISO 140–3: 1995. Acoustics: Measurement of sound insulation in buildings and of building elements – Part 3, International Standards Organisation.
3.
LyonsR. (1994). “Sound insulation of acoustic louvres and open screens”, Building Acoustics1(2), 105–124.
4.
BS 4718: 1971. Methods of test for silencers for air distribution systems.
5.
BouwkampC.J. (1949). “On the transmission of a circular aperture”, Physic. Rev., 75, 608.
6.
NomuraY.InawashiroS. (1960). “On the transmission of acoustic waves through a circular channel of a thick wall”, Sc. Rep. Tohuku Univ. (1)12B, 57–71.
7.
GompertsM.C. (1964). “The sound insulation of circular and slit shaped apertures”, Acustica14(1), 1–16.
8.
WilsonG.P.SorokaW.W. (1965). “Approximation to the diffraction of sound by a circular aperture in a rigid wall of finite thickness”, J. Acoust. Soc. Am.37(2), 286–297.
9.
SauterA.Jr.SorokaW.W. (1970). “Sound transmission through rectangular slots of finite depth between reverberant rooms”, J. Acoust. Soc. Am.47(1), 5–11.
10.
TrochidisA.PapanikolaouG. (1984). “Sound transmission through slits and circular apertures”. Archives of Acoustics9(3), 317–326.
11.
MulhollandK.A.ParbrookH.D. (1967). “Transmission of sound through apertures of negligible thickness”, J. Sound Vib.5(3), 499–508.
12.
TintiS. (1979). “Diffraction by a thick slitted screen”, J. Acoust. Soc. Am.65(4), 888–895.
13.
RosenhouseG. (1985). “A hole spoils a wall -Acoustic analysis of sound transmission through slits by the theory of diffraction”, Acustica58(4), 181–195.
14.
OldhamD.J. (1978). “The directivity of sound radiated from a large aperture”, Acoustics Letters2, 1–5.
15.
OldhamD.J.ShenY. (1982). “A scale model investigation of sound radiation from a large aperture in a building”. Appi. Acoust. 15. 397–409.
16.
AmramM.OstigutG.RousseletJ. (1983). “Optimum attenuation of low frequency noise by proper tuning of a prismatic array of waveguides”, J. Sound Vib.86(2), 253–263.
17.
WassiliefC. (1988). “Improving the noise reduction of picket barriers”, J. Acoust. Soc. Am.84(2), 645–650.
18.
GibbsB.M.BalilahY.A. (1989). “The measurement of sound transmission and directivity of holes by an impulse method”. J. Sound Vib.133(1). 151–162.
19.
CremerL.MullerH.A. (1982). “Principles and applications of room acoustics” (translated by SchultzT.J.) Volume 2. Applied Science Publishers, 181–190.
20.
KostenC.S.SmittsJ.M.A. (1951). “Sound absorption by slit resonators”, Acustica1,144–122.
21.
LonghurstR.S. (1981). “Geometrical and physical optics” (3rd edition), Longman, 230.
22.
LyonsR.GibbsB.M. (1996). “Investigation of an Open Screen Acoustic Performance”, Appl. Acoust. 49(3), 263–282.
23.
BalilahY.A. (1987). “The use of impulse techniques in the measurement of sound insulation in buildings”, PhD Thesis, University of Liverpool.
24.
Australian Acoustical Laboratory,‘“Sound insertion loss of louvre silencers”, Report No M263 (abridged).
25.
BrittainR.H.SalterC.M., “Insertion losses of standard and acoustic louvres”, 85th Meeting of the Acoustical Society of America (Boston).
26.
SharpB.H. (1978). “Prediction methods for the sound transmission of building elements” (Eqn 6), Noise Control Eng.11(2), 53–63.
