Abstract A practical expression for the estimation of sound attenuation by a barrier of finite length is presented. The sound attenuation is determined by taking account of sound contributions from rectangular sections of a plane barrier located between a point source and a receiver. The expression for the attenuation due to a finite length barrier is finally formulated by combining the attenuations due to semi-infinite plane barriers. Scale model experiments were carried out to check the validity of the expression and the results showed good agreement between them. The calculated values were also compared with the values estimated from the methods of ISO/DIS 9613-Part 2 and the Fresnel-Kirchhoff theory. It is shown that our expression is useful and applicable to the design of a finite length barrier when the sound source has a broad band spectrum and the overall sound pressure level is a matter of interest.
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