Authors : Willy Djema; Janny Ciabembi; Christian Lefi

Volume/Issue : Volume 11 - 2026, Issue 5 - May

Google Scholar : https://tinyurl.com/y4punk99

Scribd : https://tinyurl.com/5n6hvkuz

DOI : https://doi.org/10.38124/ijisrt/26may2096

Note : A published paper may take 4-5 working days from the publication date to appear in PlumX Metrics, Semantic Scholar, and ResearchGate.

Abstract : This study investigates the dynamic behavior of an aircraft fuselage structure subjected to random vibratory excitations using a hybrid finite element and spectral analysis approach. The study focuses on a simplified axisymmetric section representative of the fuselage of the Airbus A330-300. A numerical model was developed using Autodesk Simulation Mechanical 2015 under a two-dimensional plane strain formulation. First, a modal analysis was performed to extract the natural frequencies and mode shapes of the structure. The obtained results revealed the presence of global deformation modes at low frequencies and localized vibration modes at higher frequencies. Due to the limitations of the finite element software regarding direct power spectral density (PSD)-based random vibration analysis, the modal results were exported to MATLAB for spectral reconstruction of the random dynamic response. The response spectrum exhibited resonance peaks corresponding to the identified natural frequencies, confirming the dominant contribution of low-frequency modes to the overall structural response. The root mean square (RMS) displacement remained relatively low under the considered excitation conditions, indicating moderate vibratory levels. However, the study also highlights the limitations associated with the simplified axisymmetric model and the use of an approximate excitation spectrum. The proposed methodology provides a computationally efficient framework for preliminary vibration assessment of aircraft fuselage structures.

Keywords : Aircraft Fuselage; Random Vibration; Modal Analysis; Finite Element Method; Power Spectral Density; Dynamic Response; Axisymmetric Model; MATLAB; Autodesk Simulation Mechanical 2015.

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