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Radiation efficiency of natural modes of plates with beam stiffeners

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conference contribution
posted on 2011-03-02, 12:43 authored by Andreas Rousounelos, Stephen Walsh, Victor V. Krylov
In this paper, the radiation efficiency of the natural modes of finite plates with attached beams is considered. Firstly, the scattering of flexural waves, by the beams and the boundaries, in the plate is considered. The reflection and transmission coefficients along with the near-field coefficients of the beam are used to calculate the vibration field of the plate, by taking into account an infinite number of reflections from the boundaries. A wavenumber transform of the vibration velocity field is used to calculate the sound power and the radiation efficiency. The stiffening beams will shift the resonant frequencies of the plate to higher or lower frequencies depending upon the resonant frequency of the beam. This will also affect the radiation efficiency. From numerical evaluation, it is shown that the beam behaves as an added stiffness for frequencies below the resonant frequency of the beam stiffener whereas for frequencies above this frequency the beam behaves as an added mass.



  • Aeronautical, Automotive, Chemical and Materials Engineering


  • Aeronautical and Automotive Engineering


ROUSOUNELOS, A., WALSH, S.J. and KRYLOV, V.V., 2008. Radiation efficiency of natural modes of plates with beam stiffeners. Proceedings of the International Conference Acoustics 08 (CD-ROM), Acoustics 2008, Paris, France, 29th June-4th July, pp. 703-708.


Société Française d'Acoustique / The French Society of Acoustics


  • AM (Accepted Manuscript)

Publication date



This conference paper was presented at Acoustics 2008, the Joint Meeting of the Acoustical Society of America, the European Acoustics Association, and the Société Française d'Acoustique.


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