Introduction of the Fluid-Structure Coupling into the Force Analysis Technique

This paper presents a method to take into account
the fluid-structure coupling into an inverse method, the Force
Analysis Technique (FAT). The FAT method, also called RIFF method
(Filtered Windowed Inverse Resolution), allows to identify the force
distribution from local vibration field. In order to only identify the
external force applied on a structure, it is necessary to quantify the
fluid-structure coupling, especially in naval application, where the
fluid is heavy. This method can be decomposed in two parts, the first
one consists in identifying the fluid-structure coupling and the second
one to introduced it in the FAT method to reconstruct the external
force. Results of simulations on a plate coupled with a cavity filled
with water are presented.

Authors:

• Océane Grosset
• Charles Pézerat
• Jean-Hugh Thomas
• Frédéric Ablitzer

Keywords:

• Fluid-structure coupling
• inverse methods
• naval
• vibrations.

References:

[1] B. Arguillat, “´etude exp´erimentale et num´erique de champs de pression
pari´etale dans l’espace des nombres d’onde, avec application aux
vitrages automobiles,” PhD Thesis, Ecole Centrale de Lyon, Laboratoire
de M´ecanique des Fluides et d’Acoustique, 2006.
[2] D. Lecoq, “Identification par probl`eme inverse vibratoire des bas
nombres d’onde de pressions pari´etales turbulentes,” PhD Thesis,
Universit´e du Maine, Dec. 2013.
[3] M. Aucejo, “Vibro-acoustique des structures immerg´ees sous ´ecoulement
turbulent,” PhD Thesis, INSA de Lyon, Nov. 2010.
[4] O. Collery, “Optimisation de la v´erification de l’´equation
vibroacoustique des plaques sur un ´echantillonnage spatial: application
au bruit int´erieur des avions,” PhD Thesis, INSA de Lyon, Oct. 2010.
[5] H. Schlichting and K. Gersten, Boundary-Layer Theory, ser. Physic and
astronomy. MacGraw-Hill, 2000.
[6] C. P´ezerat and J.-L. Guyader, “Two inverse methods for localization of
external sources exciting a beam,” Acta Acustica, vol. 3, no. 1, pp. 1–10,
1995.
[7] C. P´ezerat, “M´ethode d’identification des efforts appliqu´es sur une
structure vibrante, par r´esolution et r´egularisation du probl`eme inverse,”
PhD Thesis, INSA, 1996.
[8] O. Grosset, “Identification of the acoustic wall pressure of a turbulent
flow exciting structures,” ICSV23, 10-14 July, Athens, Greece, 2016.
[9] C. Q. Howard and B. S. Cazzolato, Acoustic analyses using Matlab and
Ansys / Carl Q. Howard and Benjamin S. Cazzolato. CRC Press Boca
Raton, 2015.
[10] L. Maxit, “Analysis of the modal energy distribution of an excited
vibrating panel coupled with a heavy fluid cavity by a dual modal
formulation,” Journal of Sound and Vibration, vol. 332, no. 25, pp. 6703
– 6724, 2013.
[11] F. J. Fahy, Sound and structural vibration: radiation, transmission and
response. Academic press, 2012.