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 language | English |
|---|---|
| Article number | 051007 |
| Journal | Journal of Vibration and Acoustics, Transactions of the ASME |
| Volume | 135 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - Aug 14 2013 |
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All Science Journal Classification (ASJC) codes
- Acoustics and Ultrasonics
- Mechanics of Materials
- Mechanical Engineering
Cite this
Magnetic damper consisting of a combined hollow cylinder magnet and conducting disks. / Takayama, Yoshihisa; Kondou, Takahiro.
In: Journal of Vibration and Acoustics, Transactions of the ASME, Vol. 135, No. 5, 051007, 14.08.2013.Research output: Contribution to journal › Article
}
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.
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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 -