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26 July 2004 Design and testing of a bidirectional magnetostrictive-hydraulic hybrid actuator
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This paper presents the design and testing of a magnetostrictive-hydraulic hybrid actuator driven by Terfenol-D. The actuator is based on the frequency rectification of small displacements from a Terfenol-D rod by using one-directional check valves. The continuous fluid flow produced from this actuation is then used to drive a hydraulic output cylinder. A transducer was built in order to actuate the Terfenol-D rod in the pump. In addition, an active valve system was designed and built to achieve bi-directional capabilities in the actuator. Successful testing of the actuator in uni-directional and bi-directional modes was carried out. The actuator was found to have an unloaded velocity of 6 in/sec, a blocked force of 10 lbs, and a bi-directional stroke of 0.1 in/cycle at 10 Hz.
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Joshua A. Ellison, Jayant Sirohi, and Inderjit Chopra "Design and testing of a bidirectional magnetostrictive-hydraulic hybrid actuator", Proc. SPIE 5390, Smart Structures and Materials 2004: Smart Structures and Integrated Systems, (26 July 2004);

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