Employing Simplifying Hypotheses to Calculate the Noise Emitted by Industrial Structures
Abstract:This paper presents three simplified equations used to calculate the acoustic pressure radiated by vibrating closed and convex structures, together with the domains of use of these equations, which are functions of the acoustic wavelength, the dimensions of the structure, and the position of the receiving point. This modelling is tested in the case of a baffled plate and a parallepipedic box with one vibrating face, then two and five vibrating faces. In addition, these calculations allow the acoustic pressure and then the power radiated by structures to be approximated, the vibratory levels of both being homogeneous. An estimated accuracy of 3 dB(A) for the sound pressure level and 2.5 dB(A) for the sound power level can be expected.
These simplified equations are used in the case of a real machine composed of a motor-driven pump installed in a hydraulic test bench and subject to mechanical, electromagnetic, and hydraulic excitation. In this case, an estimated accuracy of 3 dB(A) for the sound pressure level and 2.6 dB(A) for the sound power level can be expected.
This methodology allows the pressure radiated in a semi-infinite field to be assessed from the results of vibratory calculations at the project stage or from the vibratory measurements on a prototype, without the use of an anechoic chamber. It can also quantify the contribution of the different sub-structures to global radiation, which is not always possible with frequential identification or by intensimetry.
Document Type: Research Article
Publication date: May 1, 2000
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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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