A piezohydraulic pump is presented that makes use of the step-and-repeat capability of piezoelectric actuators. This work discusses piezohydraulic pumping theory, pump design, and pump performance. Efficiency is analyzed for the pump cycle with theoretical efficiency being 1.0. Loss mechanisms that result in actuator heating are discussed. The pump was constructed and connected to a hydraulic actuator. The actuator was driven at 7 cm/sec with a 271 N (61 lb) blocking force. To achieve this, the piezoelectric stack actuator was driven at 60 Hz.
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