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Technical Briefs

Self-Powered Magnetorheological Dampers

[+] Author and Article Information
Young-Tai Choi

Department of Aerospace Engineering, Smart Structures Laboratory, University of Maryland, College Park, MD 20742

Norman M. Wereley1

Department of Aerospace Engineering, Smart Structures Laboratory, University of Maryland, College Park, MD 20742wereley@umd.edu

1

Corresponding author.

J. Vib. Acoust 131(4), 044501 (Jul 14, 2009) (5 pages) doi:10.1115/1.3142882 History: Received November 16, 2007; Revised March 22, 2009; Published July 14, 2009

This study addresses the feasibility and effectiveness of a self-powered magnetorheological (MR) damper using in-situ energy harvested from the vibration and shock environment in which it is deployed. To achieve this, an energy-harvesting device is designed and added to a MR damper. This energy-harvesting device consists of a stator, a permanent magnet, and a spring and operates as an energy-harvesting dynamic vibration absorber (DVA). The dynamic equation for the self-powered MR damper is derived. To evaluate the vibration isolation capability of the self-powered MR damper, a single-degree-of-freedom engine mount system using the MR damper is simulated. The governing equation of motion for the engine mount system is derived. A parametric study is conducted to find the optimal stiffness of the energy-harvesting DVA for the engine mount system. The isolation performance of the engine mount system employing the self-powered MR damper is theoretically evaluated in the frequency domain.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Typical characteristics of single-degree-of-freedom vibration isolation systems using MR dampers

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Figure 2

Schematic diagram of a self-powered MR damper

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Figure 3

Single-degree-of-freedom engine mount system using the self-powered MR damper

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Figure 4

Maximum peak value of the transmissibility of the engine mount system versus the stiffness of the energy-harvesting dynamic vibration absorber

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Figure 5

Simulated transmissibility of the vibration isolation system with the self-powered MR damper: (a) transmissibility of the engine mass |xs/xe|, (b) transmissibility of the energy-harvesting DVA |xa/xe|, (c) maximum current, and (d) maximum power

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