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Enseignement spécifique des masters - AE-01 : Acoustic propagation in inhomogeneous moving media

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
Witing of a research report and preparing a presentation in English
Using and developing numerical codes.

nombre d'heure en présentiel

33

nombre de blocs

11

Volume horaire par type d'activité pédagogique : types d'activité

  • Cours magistral : 10
  • Travaux pratiques : 9
  • Petite classe : 11

effectifs minimal / maximal

10/30

Diplôme(s) concerné(s)

domaines 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 20

Littérale/grade européen

Pour les étudiants du diplôme Diplôme d'Ingénieur de l'Ecole Nationale Supérieure de Techniques Avancées

Le rattrapage est autorisé

    Pour 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
    L'UE est acquise si Note finale >= 10
    • 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
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