Descriptif
Some noise sources can propagate over large distances, and interact in a complex manner with the propagation medium and with the frontiers of the domain. The objectives of this course are to :
- describe the physical phenomena involved in acoustic propagation: ground reflection and topography interaction, refraction effects, diffraction by obstacles, scattering by turbulent fluctuations and other inhomogeneities, etc.;
- propose models to account for these phenomena;
- apply relevant numerical methods to solve an acoustic propagation problem in a specific situation.
This course mostly focuses on the acoustic propagation in the atmospheric boundary layer, but other propagation media such as the ocean or the human body are also mentioned. Numerous application examples are presented, both for audible, infrasonic and ultrasonic sound sources.
Objectifs pédagogiques
Compétences:
Describe the physical phenomena involved in acoustic propagation: ground reflection and topography interaction, refraction effects, diffraction by obstacles, scattering by turbulent fluctuations and other inhomogeneities, etc.
Propose models to account for these phenomena
Apply relevant numerical methods to solve an acoustic propagation problem in a specific situation.
Compétences compélementaires:
Team work in a project framework
Writing of a research report and preparing a presentation in English
Using and developing numerical codes.
- Petite classe : 11
- Travaux pratiques : 9
- Cours magistral : 10
effectifs minimal / maximal:
10/30Diplôme(s) concerné(s)
Domaine Université Paris Saclay
Mention Mécanique.Pour les étudiants du diplôme Master 2 Acoustical Engineering
basic knowledge in linear acoustics and fluid mechanics
Format des notes
Numérique sur 20Littérale/grade européenPour les étudiants du diplôme Diplôme d'Ingénieur de l'Ecole Nationale Supérieure de Techniques Avancées
Le rattrapage est autoriséPour les étudiants du diplôme Master 2 Acoustical Engineering
Vos modalités d'acquisition :
1 midterm exam (1/3 of the grade), and 1 project with defense and report (2/3 of the grade)
Le rattrapage est autorisé (Note de rattrapage conservée)- le rattrapage est obligatoire si :
- Note initiale < 7
- Crédits ECTS acquis : 3 ECTS
Le coefficient de l'UE est : 3
La note obtenue rentre dans le calcul de votre GPA.
L'UE est évaluée par les étudiants.
Programme détaillé
Acoustic waves in a homogeneous unbounded medium
Introduction to the atmospheric boundary layer
Reflection of acoustic waves by a finite impedance ground
Modeling of acoustical waves in an inhomogeneous moving medium and refraction effects
Geometrical acoustics and creeping wave theory
Effects of irregular terrain and noise barriers
Scattering effects due to turbulence
Numerical models of sound propagation: ray-tracing, parabolic equation and finite difference time domain solution of the linearized Euler equations
