Influence of Non-Structural Localized Inertia on Free Vibration Response of Thin-Walled Structures by Variable Kinematic Beam Formulations

Figure 22

Modal shapes of the hollow-rectangular box beam with localized inertia at the tip cross-section (Figure 20(a), Case A).

(a) Mode 1, 16 L9 LE model (6.04 Hz)

(b) Mode 1, FEM-3D model (5.98 Hz)

(c) Mode 4, 16 L9 LE model (43.20 Hz)

(d) Mode 4, FEM-3D model (52.90 Hz)