Measuring shell resonances of spherical acoustic resonators - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue International Journal of Thermophysics Année : 2011

Measuring shell resonances of spherical acoustic resonators

Résumé

Coupling between gas and shell is a concern in the experiment used at LNE-CNAM to determine the Boltzmann constant kB by an acoustic method. As the walls of real resonators are not perfectly ridig, some perturbations occur in the frequency range of the acoustic resonances measured within helium gas contained in the caivity. As a contribution for a better understanding of the phenomenon, we have built an experiment to measure the shell modes of the spherical resonators in use in our laboratory. We report here a work in progress to assess these modes using a hammer blow method together with modal analysis. The study is carried out with air-filled, copper-walled, half-litre quasi-spherical resonator in the frequency range from 1 Hz to 20 kHz. Our results show that the shell modes expand into multiple resonances of similar modal shape, including the "breathing" mode. We confirm the observations reported in other works [4,6] of shell perturbations at other frequencies than the breathing frequency.
Fichier principal
Vignette du fichier
2011IJOT.pdf (1.67 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00623001 , version 1 (23-03-2018)

Identifiants

Citer

D. Truong, F. Sparasci, Emmanuel Foltete, Morvan Ouisse, Laurent E Pitre. Measuring shell resonances of spherical acoustic resonators. International Journal of Thermophysics, 2011, 32 (1-2), pp.427-440. ⟨10.1007/s10765-010-0846-1⟩. ⟨hal-00623001⟩
207 Consultations
773 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More