Optimization of the location and thickness of twin collinear piezoelectric actuators embedded in a layered composite structure is analytically studied. An expression for the effective moment induced by the actuators is derived using a static analysis assuming perfect bonding between layers (i. e, zero bonding thickness). The optimal actuator position and thickness which maximizes piezo-actuator/ substructure coupling is investigated for an aluminium substructure with lead zirconate titanate (PZT) actuators. Results of this study show that the optimal location for thin actuators is on the surface of the composite. However, for thicker actuator the optimum location is shown to be within the composite structure. An
analysis actuator thickness shows that the optimal actuator thickness depends on the actuator position. An explanation of this behavior is presented.