Abstract
Frequency-leveraged electrohydraulic and piezohydraulic pumps represent an alternative technology to traditional electromagnetic motors. The development of a 45 cm3 piezohydraulic pump utilizing a 2 g low-voltage piezoelectric stack is presented. The piezohydraulic pump flow rate and performance were measured and compared to existing pumps in the literature. The flow rate produced by piezohydraulic pump was a nonlinear function of pump operational frequency showing multiple peaks. These flow rate peaks were a function of accumulator size and hydraulic line resonance. The piezohydraulic pump was capable of producing a 125 kPa stall pressure, 186 mL min−1 no-load flow rate, and 0.14 W of power. This pump constitutes one of the two miniature piezohydraulic pumps capable of outputting useful mechanical work. In addition, these results demonstrate that the external hydraulic lines and hydraulic accumulators have a significant effect on the flow and power output of this technology.
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