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A bifilar suspension pendulum, a uniform density bar suspended at its two points by two strings of same length, may swing in a vertical plane or make torsional oscillation about a vertical axis. The swinging in a co-plane of the strings and the bar is called Mode 1, and the swinging in a vertical plane perpendicular to the bar is Mode 2. Mode 3 is the torsional oscillation about a vertical axis. These modes are linearly independent of each other, but it is possible to make nonlinear coupling oscillation between the modes and internal resonance. In this report, the 1-3 modes coupling oscillations are computed for parameter excitation and external forcing.

G100033 Numerical Analysis of Coupling Oscillation and Internal Resonance of Bifilar Suspension Pendulum