Year: 1965
Type: conference-abstract
Abstract: The transmission of an acoustic wave through an infinite, homogeneous, isotropic cylinder has been derived to be a strong function of frequency and the angle of incidence between the axis of the cylinder and the incoming wave. From this analysis, two important characteristics are found: the ring frequency, where the wavelength of a longitudinal wave in the material is equal to the circumference, and the coincidence frequency, where the trace wavelength of the incident wave is equal to the bending wavelength in the shell wall. The transmission loss will take on minimum values at these two points. Measurements with 13-oct-band noise excitation of a closed cylindrical shell with l/d=1.5 show the same gross features to be present and with additional effects of low-frequency resonances, but with very little angular dependence. The presence of stiffening corrugations and irregularities in the shell leads to a random vibration field and allows methods developed for the transmission of random sound through flat panels to be successfully used for noise-reduction estimates.
DOI: 10.1121/1.1939387
Author: Pritchard H. White
Language: English
Subfield: Acoustics and Ultrasonics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4240076182