Energy predictions of turbulent boundary layer induced mid-high frequency structural vibrationsReport as inadecuate

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* Corresponding author 1 LTDS - Laboratoire de Tribologie et Dynamique des Systèmes

Abstract : This paper addresses the study of vibrations induced by turbulent boundary layers TBLs flowing over plate-like structures. The aim is here to propose a predictive method in order to evaluate the vibroacoustical behaviour of a plate excited by TBL pressure fluctuations. The ultimate goal is to develop tools for predicting internal cabin noise in an aircraft during flight. Hence TBL is considered. Different TBL models are discussed and compared. A prediction method well suited for mid-high frequencies is also presented. The method called simplified energy method SEM is based on local energetic considerations and extends the well-known statistical energy analysis SEA. Two different SEM formulations are presented. The first one is of heat conduction type, whilst the second is radiative. The TBL source model was integrated in the local energy proposed formulations. When applied to a simple Kirchhoff-Love simply supported plate, SEM allows prediction of averaged energy quantities. Comparisons are drawn between heat and radiative formulations. Good concordance was observed between energy results and pure analytical calculations of the structural response under TBL excitation over a wide frequency range.

Keywords : Analytical calculations Bending vibration Cabin noise Energy flow methods Energy methods Energy predictions Kirchhoff Local energies Mid-high frequencies Plate-like structures Prediction methods Predictive methods Pressure fluctuations Sem Simply supported Source models Statistical energy analysis Structural response Structural vibrations Turbulent boundary layer Wide frequency ranges Aerodynamics Aircraft Boundary layer flow Boundary layers Cabins aircraft Energy management Plates structural components Structural dynamics Turbulence Turbulent flow Frequency response

Author: Mohamed Ichchou - Olivier Bareille - Yves Jacques -



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