- Volume 21 Issue 7
The insertion loss of the noise barriers with several top shape is measured in an anechoic room by using a reduced scale model test. The insertion loss differences between a straight vertical barrier having 0.3 m height and several barriers with simple top shaped are compared. The results show that the latter is more effective than the former and absorptive barrier is more effective than the reflective one. Among the barrier types of 'T', 'Y', and '(equation omitted)', type 'Y' is the best one and the rest have similar effect. This result is well agree with Alfredson (PIOC. Inter-Noise 95, p. 381, 1995)'s but contradict to May (J. Sound Vb. 71, p. 73, 1980)'s. Therefore, it is difficult to determine which type is the best. In order to find out this discrepancy, boundary element method is adopted and the result shows one can have different result because each supposed different experimental conditions like height of noise barrier, positions of sound source and receiver, etc.
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- J. Sound Vib. v.69 On calculation of sound fields around three dimensional objects by integral equation methods T.Terai https://doi.org/10.1016/0022-460X(80)90436-8
- J. Acoust. Soc. Am. v.86 The insertion loss of finite length barriers on the ground A.L'Esperance https://doi.org/10.1121/1.398337
- J. Acoust. Soc. Am. v.87 Model study of the sound propagation behind barriers of finite length R.Princhieva https://doi.org/10.1121/1.399177
- Appl. Acoust. v.1 Noise reduction by screens Z.Maekawa https://doi.org/10.1016/0003-682X(68)90020-0
- Appl. Acoustics v.42 Using Maekawa's chart to calculate finite length barrier insertion loss Y.W.Lam https://doi.org/10.1016/0003-682X(94)90122-8
- J. Sound Vib. v.71 Highway noise barriers: new shapes D.N.May;M.M.Osman https://doi.org/10.1016/0022-460X(80)90410-1
- J. Acoust. Soc. Am. v.75 Model studies of barrier performance in the presence of ground surfaces Part Ⅱ- different shapes D.A.Hutchins;H.W.Hones;L.T.Russell https://doi.org/10.1121/1.390993
- PIOC. Inter-Noise 95 Special shapes and treatment for noise barriers R.J.Alfredson;X.Du
- SYSNOISE Manual Rev. 5.3 Anon.
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- 日本音響學會紙 v.54 Determination of acoustic property for improved noise barriers Technical Committee on Noise and Vibration