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Vibroacoustique des mécanismes à hautes fréquences
Application aux transmissions par engrenage

Abstract : A new method is proposed to predict the noise radiated in the high frequency range by a structure vibrating in the low frequency range. This method is called hybrid as it couples two methods valid on different frequency ranges. The application we propose is concerned with the noise radiated by the casing of a gearbox inside an engine compartment. The vibratory behaviour of the casing is induced by the excitation produced by meshing process, the static transmission error. It is computed with an original method allowing the solving of parametrically excited systems. Equivalent energy sources are introduced to reproduce the noise radiated in the free field by the casing of the gearbox. Each source is the sum of three contributions due to a pressure source, a velocity source and an intensity source. Analytical formulations for the amplitudes and directivity diagrams of these sources are proposed. They are then used in the radiative transfer method based on the radiative transfer exchanges in thermics which estimates the acoustical field inside the engine compartment. This method is generalized in this work to account for acoustical diffraction. The hybrid method has been applied to a baffled plate, and to a ribbed plate whose surface vibratory and pressure fields are previously measured, and results have been compared to those given by the boundary element methods. Finally, the case of a gearbox inside the engine compartment of a truck is solved. The main interest of the hybrid method is to couple a low frequency vibratory method to a high frequency acoustical method which leads to reduced computational times compared to the boundary element methods.
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Contributor : Emeline Sadoulet-Reboul <>
Submitted on : Thursday, March 23, 2006 - 4:09:46 PM
Last modification on : Wednesday, November 20, 2019 - 2:27:19 AM
Long-term archiving on: : Saturday, April 3, 2010 - 11:01:47 PM


  • HAL Id : tel-00012024, version 1



Emeline Sadoulet-Reboul. Vibroacoustique des mécanismes à hautes fréquences
Application aux transmissions par engrenage. Acoustique [physics.class-ph]. Ecole Centrale de Lyon, 2005. Français. ⟨tel-00012024⟩



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