Scattering acoustic field above a rigid rectangular parallelepipedic shape
- Resource Type
- Authors
- Khanfir, Adel; DUCOURNEAU, Joël; FAIZ, Adil; Hamouda, Safa Ben; Chevret, Patrick
- Source
- Forum Acusticum
Forum Acusticum, Dec 2020, Lyon, France. pp.3287-3292, ⟨10.48465/fa.2020.0580⟩
- Subject
- [PHYS.MECA.VIBR]Physics [physics]/Mechanics [physics]/Vibrations [physics.class-ph]
industrial rooms
scatter acoustic waves
rectangular parallelepipedic shape
[PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
- Language
International audience; Noise at work is a real health problem that affects many employees at their workstations. Irregular reliefs of walls facings that delimit industrial premises disturb the acoustic field and make the sound levels control difficult to preserve the employees. This requires development of theoretical and experimental methods allowing acoustic characterization of these facings. Such walls, which possess periodic or aperiodic relief (rectangular cavities or volumes as furniture), scatter acoustic waves. This work consists in developing a theoretical model to predict the acoustic pressure field reflected and scattered over a rigid rectangular parallelepipedic shape on an infinite rigid screen. Originally, the model was based on a study of strips in electromagnetism. It was adapted to study the acoustic behavior of a rigid rectangular parallelepipedic shape by considering the specular reflection and the diffracted reflection and transmission of the incident field. The model was compared with the results of a numerical simulation (Finite Element Method) and the experimental ones obtained in the semi-anechoic room for a elementary rigid rectangular parallelepipedic shape insonified by an incident spherical acoustic field. The observed concordance between the numerical and experimental results supports the validity of our model over a wide spectral range.