An Approach for Prediction of Acoustic Radiation from a Structure with Construction of the In Situ Vibroacoustic Transfer Function
Abstract: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: January 1, 2002
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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