Computational Modal Analysis of a Twin-Engine Rear Fuselage Mounted Aircraft Support Frame

The focus of this investigation was to computationally determine the vibrational characteristics of a rear fuselage mounted aircraft engine support frame. A pseudo-orthogonality check was performed to compare the computational results with experimental data. This produced a matrix with 8 modes with diagonal terms >0.9. Structural modifications were made to the computational model of the frame in order to decrease the modal density near the …