Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2005 · 10 citations · 0 references
EngineeringMechanical EngineeringActuatorsHydraulic EngineeringHydraulicsActuator DesignActuator EfficiencyControl ValvesElectric ActuatorsHydraulic ActuationHydraulic ActuatorsComplianceEntrapmentMaximum Flow RateMaximum Power OutputMechanical PowerPower OutputPumping SystemsValves
The PiezoHydraulic Pump (PHP) used in this work currently uses proprietary check valves that allow the PHP to be operated at 1 kHz. At a bias pressure of 500 psi and operating voltage of 1 kV, the PHP produces a mechanical power output of 46 W. The PHP was baseline tested using both the proprietary valves (internal) and external commercial passive check valves. Using the external valves at a bias pressure of 80 psi, the PHP was tested at various frequencies. At an operating frequency of 150 Hz, the maximum flow rate was 0.91 cc/s, while at 125 Hz, the maximum mechanical power output was 0.18 W (0.64 W/kg). This significant decrease in characteristics can be attributed to an increase in system compliance by moving the valves external to the pump housing and possible air entrapment within the chamber.