On the Sound Radiation From a Circular Hatchway

Abstract

low-frequency noise sound radiation circular plate hatchway

Asymptotic Approximation of the Modal Acoustic Impedance of a Circular Membrane

“…in Refs. 16,17,[19][20][21]31 and 41. Also it has been shown how to use the modal quantities presented to ensure some proper results for physical quantities such as acoustic power, acoustic pressure and vibration velocity including acoustic attenuation.…”

“…Several discrete calculation methods have often been hybridized with the vibration velocity measurements to determine the sound radiation efficiency of vibrating structures within the low frequency range. [15][16][17] While the finite element method, the boundary element method, the lumped parameter model and the radiation resistance matrix have often been used to evaluate numerically both the vibration velocity and the sound radiation properties of different flat deformable bodies [18][19][20][21] ; a number of approximate methods such as the discontinuous Galerkin method, the nonconforming finite element, discrete Fourier transform modal analysis of spectral element method have been used for solving numerically the wave equation and determining the acoustic waves propagated. [22][23][24][25] In a few cases, the calculation of radiation impedance has been conducted on the basis of exact solutions to the vibration problems of thin flat circular, rectangular and annular membranes and plates.…”

The Acoustic Pressure Radiated by a Vibrating Circular Plate within the Fraunhofer Zone of the Three-Wall Corner Region

“…The modal quantities (5) related to the acoustic pressure can be formulated on the basis of Eqs. (6) and 12as follows:…”

Radiation efficiency of a distribution of baffled pistons with arbitrary phases

“…Going further, this semi-analytical formulation was employed by Arenas (2008) for calculating the radiation properties of simple baffled structures in terms of structural and radiation modes (see also Elliott and Johnson, 1993;Naghshineh and Koopmann, 1991). Arenas (2009) employed the same method for a circular hatchway and pointed out its validity for studying the radiation of a baffled complex shaped structure, with no numerical integration needed for calculating the acoustic radiation but still required in the eigenanalysis of the structure's vibration.…”