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Proceedings Paper

Piezoelectric hydraulic pump development
Author(s): Lisa D. Mauck; Jacqueline Menchaca; Christopher S. Lynch
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Paper Abstract

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.

Paper Details

Date Published: 22 June 2000
PDF: 11 pages
Proc. SPIE 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems, (22 June 2000); doi: 10.1117/12.388881
Show Author Affiliations
Lisa D. Mauck, Georgia Institute of Technology (United States)
Jacqueline Menchaca, Georgia Institute of Technology (United States)
Christopher S. Lynch, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 3985:
Smart Structures and Materials 2000: Smart Structures and Integrated Systems
Norman M. Wereley, Editor(s)

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