An Approach for Prediction of Acoustic Radiation from a Structure with Construction of the In Situ Vibroacoustic Transfer Function
The aim of this study is to provide a tool that will allow the in situ acoustic radiation from an industrial structure to be determined from experimental vibratory data. The difficulty lies in describing the analytical Green's function acting as a vibroacoustic transfer function
between the structure and the surrounding acoustic medium. The proposed approach is based on the numerical construction of this function from normal vibratory velocities and acoustic pressure measurements which respectively define the vibrating body and the radiated sound field. The mathematical
model assumes a distribution of point sources with a density function allocated to them. The density function is calculated from in situ measurements of the modulus and phase of the acoustic pressure carried out over a conformal surface enclosing the vibrating structure. This function
contains the acoustic radiation of the structure and the room acoustic contributions. The in situ vibroacoustic transfer function of the structure is determined numerically using the density function at the structure point sources, and the normal vibratory velocities measured at the
same points. This enables the acoustic radiation from the structure in its real surroundings to be predicted for a new vibratory state. The paper presents the mathematical model and a numerical implementation of the proposed approach. Some numerical and experimental comparisons are made for
a structure vibrating in an ordinary room to illustrate the potential and the limitations of the method.
Document Type: Research Article
Publication date: 01 January 2002
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