Model study of the sound propagation behind barriers of finite length

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Abstract
A scale model study is presented of the sound diffraction behind thin barriers of finite length on hard, reflecting ground. The measurements have been carried out in an anechoic chamber using a point source for the frequency range 5–20 kHz and scaled barrier lengths from 5 to 120 cm, with a scale factor of 1:20. The line integral theory [see Embleton, J. Acoust. Soc. Am. 6 7, 43–45 (1980)] was used to calculate by numerical integration the sound field behind the barrier, taking into account the diffraction not only from the top edge of the screen, but also from both side edges. In each case the prediction scheme allowed for the reflection from the finite‐impedance ground. Experimental curves of sound pressure level distribution behind barriers of different lengths and heights have shown very good agreement with theoretically predicted values.

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