Abstract
Novel piezoelectric cylindrical ceramic actuators have been developed utilizing the d 15 piezoelectric shear coefficient. These solid state actuators are segmented piezoelectric tubes that generate high torque and angular displacement. This rotary actuation can be applied to the trailing edge flap of a helicopter rotor blade to reduce vibration and to provide real time active blade tuning. For long stroke applications, rotary inchworm/motor devices were designed and fabricated using roller clutches to accumulate the minute displacement of the actuator over many cycles of the applied ac field. Operating at the resonant frequency of the actuator, the amplitude of the rotary angle is amplified by the mechanical quality factor of the device.
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