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In the experiment two piezoceramic actuators are prepared. One is adhered to the beam along the structural axis for controlling the flexural vibration mode of the beam, where it is called ACT1. Another is attached perpendicular to the principal axis of elasticity (PAE) of the beam for controlling the torsional vibration mode of the beam; where it is called ACT2. In the static test a cantilevered composite beam having an eccentric mass at the free end is prepared and the direction of the PAE is found based on the definition of the PAE, and natural frequencies of flexural and torsional vibration are obtained by the experiment. The vibrational behavior of the beam is examined by forced vibration tests under sinusoidal excitation having a natural frequency of the first flexural or torsional mode when ACT1 and/or ACT2 are operated. Equations of motion with two degrees of freedom are derived using laminated plate theory and the equilibrium of forces and moments. The experimental result is substantiated by simulation using the equations of motion and control theory.

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