Scale model experiments on the validity of the matched asymptotic expansions theory for sound diffraction by curved surfaces of finite impedance

Scale model experiments have been conducted to study the diffraction of sound by a curved surface of finite impedance. The theory of matched asymptotic expansions (MAE) offers an alternative to Berry and Daigle’s generalized creeping wave series. [J. Acoust. Soc. Am. 83, 2047–2058 (1988)] Experimental results are in excellent agreement (less than 1 dB) with predictions from the MAE theory both in the deep shadow zone and in the penumbra along the line of sight.