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Proceedings Paper

A magnetorheological hydraulic actuator driven by a piezopump
Author(s): Jin-Hyeong Yoo; Jayant Sirohi; Norman M. Wereley; Inderjit Chopra
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Paper Abstract

Magnetorheological (MR) fluids can be used in a variety of smart semi-active systems. The MR damper shows an especially great potential to mitigate environmentally induced vibration and shocks. Another aspect of MR fluids is the construction of MR valve networks in conjunction with a hydraulic pump resulting in a fully active actuator. Conventional hydraulic pumps, however, are bulky, contain many moving parts, and do not scale favorably with decreasing size motivating development of high energy density piezohydraulic pumps. 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 piezopump 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 acuator 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, and is evaluated with experimental measurements. This will provide a design tool to develop an actuator for a specific application. The prototype actuator achieved an output velocity of 5.34mm/sec against a mass load of 5.15kg with a piezopump weighing 300gm.

Paper Details

Date Published: 5 August 2003
PDF: 13 pages
Proc. SPIE 5056, Smart Structures and Materials 2003: Smart Structures and Integrated Systems, (5 August 2003); doi: 10.1117/12.483497
Show Author Affiliations
Jin-Hyeong Yoo, Univ. of Maryland, College Park (United States)
Jayant Sirohi, Univ. of Maryland, College Park (United States)
Norman M. Wereley, Univ. of Maryland, College Park (United States)
Inderjit Chopra, Univ. of Maryland, College Park (United States)

Published in SPIE Proceedings Vol. 5056:
Smart Structures and Materials 2003: Smart Structures and Integrated Systems
Amr M. Baz, Editor(s)

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