A periodic surface structure with extreme acoustic properties
Tóm tắt
Several variational problems of sound absorption and scattering are solved using an impedance-based approach. Analytical expressions are derived for the surface impedances of the best absorber and a perfectly transparent body. A discrete surface structure (coating) is proposed for implementing their acoustic properties. Results of computer simulation are presented.
Tài liệu tham khảo
Yu. I. Bobrovnitskii, Akust. Zh. 53, 113 (2007) [Acoust. Phys. 53, 100 (2007)].
Yu. I. Bobrovnitskii, Akust. Zh. 54, 879 (2008) [Acoust. Phys. 54, 758 (2008)].
K. Zwikker and C. Kosten, Sound Absorbing Materials (Elsevier, Amsterdam, 1949; Inostr. Liter., Moscow, 1952).