LOCAL ADMITTANCE MODEL FOR ACOUSTIC SCATTERING FROM A CYLINDRICAL-SHELL WITH MANY INTERNAL OSCILLATORS

This paper considers whether local admittance fluctuations can explain the acoustic scattering from a submerged shell with many internal osc illators observed by Bucaro et al. [Proc. ASME, Noise Control and Acou stics Div., NCA 22, 87-92 (1996)] and Photiadis ct al. [J. Acoust. Sec . Am. 101, 895-899 (1997)]. The scattering is computed using a Helmhol tz-based approach for a locally reacting surface whose admittance is a ffected by the random placement of internal oscillators. The predicted scattering patterns versus frequency and monostatic scattering angle are shown to agree with what is observed in the measured results. (C) 1998 Acoustical Society of America.