A coupled FE-RRM-based numerical model for analysis of energy transmission loss through stiffened double-wall panel due to TBL excitation

TL;DR

This paper introduces a comprehensive FE-RRM numerical model to accurately predict energy transmission loss in stiffened double-wall aircraft panels under turbulent boundary layer excitation, accounting for complex structural and material effects.

Contribution

A novel coupled FE-RRM model that incorporates orthotropic lamina, variable stiffening, and damping effects for improved TL prediction in aircraft panels.

Findings

Model captures effects of stiffener orientation and panel thickness.

Predicts transmission loss with high accuracy across frequencies.

Flexible for different panel configurations and materials.

Abstract

We propose a fully coupled numerical model to predict energy transmission through a turbulent boundary layer (TBL) excited stiffened double-leaf flexible aircraft panel using a finite element (FE) framework. Mindlin first order shear deformation model is adopted for the panels and a TBL-structure-acoustic coupling model is developed using finite element-radiation resistance matrix (FE-RRM) approach to predict the transmission loss (TL) through double-leaf panels with variable thickness and stiffener orientation. The model is also capable to capture the contribution of orthotropic lamina sequence and frequency-dependent structural damping in predicting the TL. Thus, a new numerical model is proposed that enables the designers with greater flexibility in terms of the number of panel leaves, boundary, and stiffening condition of the aircraft panel-cavity-panel system, made of isotropic or orthotropic laminates.