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Proceedings Paper

Bidirectional control of a magnetorheological piezohydraulic actuator
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Paper Abstract

Magnetorheological (MR) fluids can be used in a variety of smart semi-active systems. MR dampers have especially great potential to mitigate environmentally induced vibration and shocks. MR fluid can be used effectively in valve networks to control the flow from a hydraulic source to enable a fully active actuator. These devices are simple, have few moving parts and can be easily miniaturized to provide a compact, high energy density pressure source. The present study describes a prototype MR-piezo hybrid actuator that combines the piezo-pump and MR valve actuator concepts, resulting in a self-contained hydraulic actuation device without active electro-mechanical valves. Durability and miniaturization of the hybrid device are major advantages due to its low part count and few moving parts. An additional advantage is the ability to use the MR valve network in the actuator to achieve controllable damping. The design, construction and testing of a prototype MR-piezo hybrid actuator is described. The performance and efficiency of the device is derived using ideal, biviscous and Bingham-plastic representations of MR fluid behavior. Unidirectional performance, or constant velocity actuator shaft motion, is assessed analytically and compared to experimental data. A experimental assessment of the magnetorheological birectional flow control capability is also provided.

Paper Details

Date Published: 26 July 2004
PDF: 11 pages
Proc. SPIE 5390, Smart Structures and Materials 2004: Smart Structures and Integrated Systems, (26 July 2004); doi: 10.1117/12.547577
Show Author Affiliations
Jin-Hyeong Yoo, Univ. of Maryland/College Park (United States)
Jayant Sirohi, Univ. of Maryland/College Park (United States)
Shaju John, Univ. of Maryland/College Park (United States)
Anirban Chaudhuri, Univ. of Maryland/College Park (United States)
Christopher Cadou, Univ. of Maryland/College Park (United States)
Norman M. Wereley, Univ. of Maryland/College Park (United States)


Published in SPIE Proceedings Vol. 5390:
Smart Structures and Materials 2004: Smart Structures and Integrated Systems
Alison B. Flatau, Editor(s)

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