22 June 2000 Piezoelectric hydraulic pump development
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Recent research in smart wing technology has led to the identification of a need for large displacement (0.1 to 10 mm), high force (10 to 2000 N) actuators that function over low to intermediate frequency bands (0.1 to 200 Hz). A hybrid piezohydraulic pump is under development for this smart structures application. Piezoelectric stack actuators are capable of producing large forces at higher bandwidth, but the stroke is too small. Shape memory alloys are capable of producing a larger stroke, but the bandwidth is too low. Step and repeat piezoelectric devices, such as inchworm motors, increase the power output of the actuators and have the potential to produce large forces and large displacements simultaneously. The piezohydraulic pump makes use of the step and repeat capability. A preliminary piezoelectric stack actuator driven hydraulic pumps system was constructed. The pump was connected to a hydraulic actuator and the actuator driven at 1 cm/sec with a 490 N (110 lb) blocking force. To achieve this, the stack actuator was driven at 10 Hz. Two subsequent generations of the piezohydraulic pump achieved intermittent actuation rates of 10 cm/sec. This work presents efficiency considerations and design modifications utilized in the subsequent generations of the piezohydraulic pump. The relationship between the diameter of the hydraulic actuator, actuation rate, and blocking force are discussed. Effective use of accumulators to increase actuation rate and control bias pressure is also discussed.
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Lisa D. Mauck, Lisa D. Mauck, Jacqueline Menchaca, Jacqueline Menchaca, Christopher S. Lynch, Christopher S. Lynch, } "Piezoelectric hydraulic pump development", Proc. SPIE 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems, (22 June 2000); doi: 10.1117/12.388881; https://doi.org/10.1117/12.388881

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