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Research Papers

Design and Experimental Verification of Position-Dependent Passive Electromagnetic Damping

[+] Author and Article Information
Asil Arif Aksekili

Mem. ASME
Department of Mechanical Engineering,
Yeditepe University,
Istanbul 34755, Turkey
e-mail: asilaksekili@asme.org

Nezih Topaloglu

Mem. ASME
Department of Mechanical Engineering,
Yeditepe University,
Istanbul 34755, Turkey
e-mail: ntopaloglu@asme.org

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received May 28, 2015; final manuscript received February 4, 2016; published online March 30, 2016. Assoc. Editor: Davide Spinello.

J. Dyn. Sys., Meas., Control 138(6), 061003 (Mar 30, 2016) (7 pages) Paper No: DS-15-1249; doi: 10.1115/1.4032828 History: Received May 28, 2015; Revised February 04, 2016

A linear dashpot is a common equipment used in shock and vibration isolation. It has been shown theoretically that the vibration isolation performance can be significantly improved by a damping profile that depends on the piston relative position. In this study, a position-dependent damping profile is realized by using electromagnetic principles. The idea is to have multiple coil windings on the outer cylinder and to use a magnet as a piston. The damping profile is tuned by changing the number of turns at each coil. As a result of the magnet-coil arrangement, the architecture also has the capability of being regenerative. A unique experimental setup is constructed that measures damping electrically in a multiple coil arrangement. Least-squares optimization method is used to tune the number of turns. It is shown that the coil turns can be successfully tailored to realize a desired damping profile. The position-dependent damping architecture has the potential to be used in future regenerative dampers.

FIGURES IN THIS ARTICLE
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Copyright © 2016 by ASME
Topics: Magnets , Damping , Dampers , Design
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Figures

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Fig. 1

A typical electromagnetic damper with single-coil arrangement and its damping profile

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Fig. 2

The proposed electromagnetic damper with multiple-coil arrangement and its damping profile

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Fig. 3

(a) Magnet and coil and (b) equivalent circuit

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Fig. 4

Solid model of the experimental setup

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Fig. 5

(a) Perspective view of the coil holder and (b) dimensions of the coil holder (dimensions in millimeter)

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Fig. 6

Fully assembled experimental setup

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Fig. 7

Open-circuit voltage waveforms at different magnet speeds

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Fig. 8

Open-circuit voltage waveforms at coil turns of 50, 100, and 150

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Fig. 9

Linear interpolation to find the voltage εij

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Fig. 10

Uniform and nonuniform damping profiles

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Fig. 11

Calculated damping and experimental damping for uniform desired damping

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Fig. 12

Calculated damping and experimental damping for nonuniform desired damping

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