Magnetic damper consisting of a combined hollow cylinder magnet and conducting disks

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

It is recognized that unstable vibration occurs at a rotating speed above the major critical speed by a rotating-conducting-disk type magnetic damper, but not by a rotating-circular-magnet type magnetic damper. In addition, magnetic dampers generally have relatively poor damping performance. In the present work, two new rotating-circularmagnet type magnetic dampers, (which consist of a combined hollow cylinder magnet with alternating directional magnetic poles), are introduced and their design method is presented. Applying the modeling method that the authors have been studying, a prototype magnetic damper with a combined magnet is fabricated and the damping ratios from the analytical results agree well with those from the experimental results. Rotating tests are performed and it is confirmed that unstable vibration does not occur at a rotating speed of more than twice the major critical speed. Based on these findings, an optimally designed magnetic damper with a combined magnet is developed and a damping ratio of 0.25 (damping coefficient of 215 Ns/m) is achieved.

Original languageEnglish
Article number051007
JournalJournal of Vibration and Acoustics, Transactions of the ASME
Volume135
Issue number5
DOIs
Publication statusPublished - Aug 14 2013

Fingerprint

dampers
Magnets
hollow
magnets
Damping
conduction
damping
critical velocity
magnetic poles
Poles
vibration
prototypes
coefficients

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

@article{2283d3d8467b4ba7a68f261812266a9e,
title = "Magnetic damper consisting of a combined hollow cylinder magnet and conducting disks",
abstract = "It is recognized that unstable vibration occurs at a rotating speed above the major critical speed by a rotating-conducting-disk type magnetic damper, but not by a rotating-circular-magnet type magnetic damper. In addition, magnetic dampers generally have relatively poor damping performance. In the present work, two new rotating-circularmagnet type magnetic dampers, (which consist of a combined hollow cylinder magnet with alternating directional magnetic poles), are introduced and their design method is presented. Applying the modeling method that the authors have been studying, a prototype magnetic damper with a combined magnet is fabricated and the damping ratios from the analytical results agree well with those from the experimental results. Rotating tests are performed and it is confirmed that unstable vibration does not occur at a rotating speed of more than twice the major critical speed. Based on these findings, an optimally designed magnetic damper with a combined magnet is developed and a damping ratio of 0.25 (damping coefficient of 215 Ns/m) is achieved.",
author = "Yoshihisa Takayama and Takahiro Kondou",
year = "2013",
month = "8",
day = "14",
doi = "10.1115/1.4024094",
language = "English",
volume = "135",
journal = "Journal of Vibration and Acoustics, Transactions of the ASME",
issn = "1048-9002",
publisher = "American Society of Mechanical Engineers(ASME)",
number = "5",

}

TY - JOUR

T1 - Magnetic damper consisting of a combined hollow cylinder magnet and conducting disks

AU - Takayama, Yoshihisa

AU - Kondou, Takahiro

PY - 2013/8/14

Y1 - 2013/8/14

N2 - It is recognized that unstable vibration occurs at a rotating speed above the major critical speed by a rotating-conducting-disk type magnetic damper, but not by a rotating-circular-magnet type magnetic damper. In addition, magnetic dampers generally have relatively poor damping performance. In the present work, two new rotating-circularmagnet type magnetic dampers, (which consist of a combined hollow cylinder magnet with alternating directional magnetic poles), are introduced and their design method is presented. Applying the modeling method that the authors have been studying, a prototype magnetic damper with a combined magnet is fabricated and the damping ratios from the analytical results agree well with those from the experimental results. Rotating tests are performed and it is confirmed that unstable vibration does not occur at a rotating speed of more than twice the major critical speed. Based on these findings, an optimally designed magnetic damper with a combined magnet is developed and a damping ratio of 0.25 (damping coefficient of 215 Ns/m) is achieved.

AB - It is recognized that unstable vibration occurs at a rotating speed above the major critical speed by a rotating-conducting-disk type magnetic damper, but not by a rotating-circular-magnet type magnetic damper. In addition, magnetic dampers generally have relatively poor damping performance. In the present work, two new rotating-circularmagnet type magnetic dampers, (which consist of a combined hollow cylinder magnet with alternating directional magnetic poles), are introduced and their design method is presented. Applying the modeling method that the authors have been studying, a prototype magnetic damper with a combined magnet is fabricated and the damping ratios from the analytical results agree well with those from the experimental results. Rotating tests are performed and it is confirmed that unstable vibration does not occur at a rotating speed of more than twice the major critical speed. Based on these findings, an optimally designed magnetic damper with a combined magnet is developed and a damping ratio of 0.25 (damping coefficient of 215 Ns/m) is achieved.

UR - http://www.scopus.com/inward/record.url?scp=84881305500&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84881305500&partnerID=8YFLogxK

U2 - 10.1115/1.4024094

DO - 10.1115/1.4024094

M3 - Article

AN - SCOPUS:84881305500

VL - 135

JO - Journal of Vibration and Acoustics, Transactions of the ASME

JF - Journal of Vibration and Acoustics, Transactions of the ASME

SN - 1048-9002

IS - 5

M1 - 051007

ER -