A coupled FE-BE approach for vibro-acoustic response prediction of laminated composite panels due to turbulent boundary layer excitation involving Cholesky decomposition

TL;DR

This paper presents a novel numerical framework combining finite element and boundary element methods, utilizing Cholesky decomposition, to predict vibro-acoustic responses of laminated composite panels under turbulent boundary layer excitation.

Contribution

A new coupled FE-BE approach with Cholesky decomposition for efficient vibro-acoustic response prediction of laminated composites under turbulent boundary layer excitation.

Findings

Effective prediction of sound radiation from composite panels.

Versatile framework adaptable to complex geometries and materials.

Potential for early-stage design optimization.

Abstract

An original numerical framework is developed in the present research work in order to estimate the free field sound radiation from baffled structural panels subjected to turbulent boundary layer-induced excitation. A semi-analytical method is used to estimate the TBL wall pressure spectrum which is decomposed using Cholesky technique to obtain random wall pressure in the frequency domain. Structural panels are modeled using the finite element technique and a coupled finite element boundary element modeling technique is developed to estimate the sound power level radiating into the free field. Results are obtained for laminated composite structural panels with various fiber orientations and significant findings are discussed. The developed technique has the potential to be further extended for complex structures in terms of geometry, material properties, and boundary conditions. The complete numerical toolbox, developed in an in-house MATLAB environment, enables the prediction of turbulent structure acoustic coupled behavior at an early design stage.