test_moissonnage_selune
type: Agent

Relation between the shape and radiation of a finite length resonator. Numerical and experimental study of his complex resonances.
type: Dataset
contact point: Organization
  fn: CCSD
keyword: theorie-modale
keyword: wind-instruments
keyword: resonateur-de-longueur-finie
keyword: fonction-de-green
keyword: horn
keyword: matrices-de-transmission
keyword: complex-resonances
keyword: resonances-complexes
keyword: transmission-matrices
keyword: greens-function
keyword: pavillon
keyword: spiacouengineering-sciences-physicsacoustics-physicsclass-ph
keyword: finite-resonator
keyword: theses
keyword: instruments-a-vent
keyword: rayonnement
keyword: infoeu-reposemanticsdoctoralthesis
keyword: bem
keyword: physmecaacouphysics-physicsmechanics-physicsacoustics-physicsclass-ph
keyword: radiation
keyword: modal-theory
landing page: https://theses.hal.science/tel-00686893
description: The principal goal of this work was to develop a numerical method to study the coupling between internal and external fluid of a resonator, notably to study the link between the shape of a finite length resonator and his radiation. For this we study complex resonances, corresponding to the poles of the Green's function of system coupled with the external environment. The imaginary part of resonance frequencies is here directly related to losses due to radiation. We based our work on three main areas: an analytical study using a modal theory with the inclusion of non-planar modes, the development of a numerical method based on boundary finite elements and an experimental comparison of our theoretical results. The analytical modal theory has allowed us to study the radiation of finite length cylindrical pipe opening into an infinite screen, which is a reference case for further study. The numerical method, developed in a Fortran parallelized code, gave us the opportunity to study resonators with more complex geometries such as horns. To reduce computation time, we introduced an hybrid method mixing modal theory to describe the conservative part of system, that allows fast computation, and boundary element method, allowing a fine representation of complex geometries, to describe the radiating part. We have finished this work with a first experimental validation of results.
issued: 2026-05-22T04:59:04.466193
language: fr
modified: 2026-05-22T04:59:04.466199

Relation between the shape and radiation of a finite length resonator. Numerical and experimental study of his complex resonances.
type: Distribution
access URL: https://theses.hal.science/tel-00686893
format: HTML
issued: 2026-05-22T04:59:04.522929
modified: 2026-05-22T04:59:04.417327