Acoustic radiation from a finite-length shell with substructures subjected to an impulsive load

Acoustic radiation from the submerged circular cylindrical shell treated with active constrained layer damping

“…Like Refs. [13] and [14], two semi-spherical rigid baffles are linked at the ends of the cylindrical shell in Fig. 1.…”

“…To date, analytical representations of the acoustic pressure of single layer cylindrical shells with ribs or deck-type internal plates have been achieved. [9][10][11][12][13][14] Among them, a finite length cylindrical shell model was mainly developed to obtain the sound pressure of an underwater cylindrical shell by introducing two infinite rigid baffles at the ends of the shell. However, as the infinite rigid baffles would change the real shape of the external liquid field, a little deviation might be brought in that model.…”

“…Thus, hemi-spherical or flat plate rigid baffles gradually replaced the conventional infinite ones to obtain a more accurate solution. [13][14][15] As for the solution for the acoustic pressure of submerged laminated cylindrical shells, numerical methods such as FEM, BEM, and FEM/BEM are still the major choices. Recently in the last twenty years, a virtual source simulation technique, which was based on the superposition principle and the uniqueness theorem for the Helmholtz problem, has been proposed and proved to be effective for solving the acoustic boundary value problem.…”

Investigation on impact noise radiated by the elastic collision of multiple spheres

“…Kallivokas and Bielak (1993) provide an efficient procedure to solve the problems on exterior transient noise radiation and scattering involving an infinite elastic circular shell submerged in an unbounded acoustic fluid medium. Choi et al (1995) also present a method to obtain the noise radiation from a finite-length cylindrical shell with substructures subjected to an impulsive load. Chappell et al (2006) simulate the external transient acoustic generated by a fluid-submerged finite-length cylinder.…”

An interpolated time-domain equivalent source method for modeling transient acoustic radiation over a mass-like plane based on the transient half-space Green’s function

“…This technique allows one to reconstruct or predict the radiated harmonic acoustic field in the frequency domain [4][5][6][7]. For the purpose of inversely studying the transient acoustic problems [8,9] in the time domain, some timedomain NAH (TNAH) methods [10][11][12][13][14] have been developed during the last two decades. Such TNAH methods have the ability to model the transient sound field but are, in theory, confined to the sound sources of planar geometry.…”