Eigenvalue Analysis of 2D Aircraft Fuselage Beam Model and Fuselage Air Cavity Using a Symmetric Fluid-Structure Interaction Finite Element Formulation

摘要

An eigenvalue analysis for a two dimensional model of an aircraft fuselage and the passenger compartment was performed. The uncoupled eigenvalues and eigenvectors as well as the coupled were calculated. The effect of the air on the fuselage structure results in a lowering of the frequencies while the modes remain the same. The eigenfrequencies for the air cavity are increased but the modes are much like the uncoupled modes. However, for modes where the frequencies in the uncoupled solutions are close together, the coupling results in large shifts and new eigenmodes.