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Journal of Zhejiang University SCIENCE A 2006 Vol.7 No.101 P.271~276

10.1631/jzus.2006.AS0271


Studies on a passive electromagnetic damper


Author(s):  Zheng Shui-Ying, Pan Xiao-Hong, Ma Zhen-Fei

Affiliation(s):  Institute of Chemical Machinery, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   zhengshuiying@zju.edu.cn, pan_xh@zju.edu.cn

Key Words:  Passive electromagnetic damper, Rotor, Vibration control


Zheng Shui-Ying, Pan Xiao-Hong, Ma Zhen-Fei. Studies on a passive electromagnetic damper[J]. Journal of Zhejiang University Science A, 2006, 7(101): 271~276.

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author="Zheng Shui-Ying, Pan Xiao-Hong, Ma Zhen-Fei",
journal="Journal of Zhejiang University Science A",
volume="7",
number="101",
pages="271~276",
year="2006",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.2006.AS0271"
}

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%A Pan Xiao-Hong
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2006.AS0271

TY - JOUR
T1 - Studies on a passive electromagnetic damper
A1 - Zheng Shui-Ying
A1 - Pan Xiao-Hong
A1 - Ma Zhen-Fei
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SP - 271
EP - 276
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Y1 - 2006
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2006.AS0271


Abstract: 
The passive electromagnetic damper has the same configuration as that of the electromagnetic bearing, but no sensors and no closed loop control are needed. Its robustness and no-contact structure are its great advantages. When the rotor vibrates, the electromagnetic field intensity in the air gap is altered, then fluctuating currents in the damper coils and eddy currents inside the surface layer of rotor are created. Damping force is caused by the fluctuating currents, while retardation torque is generated by eddy currents. The characteristics of a damper may be improved by adding an additional electrical circuit. Numerical studies showed that damping coefficient increases with increasing static current, but decreases with increasing frequency. And the damping coefficient of the improved damper at higher frequency is more evident than that of the original damper. Experimental results showed that the resonant vibration around the first critical speed was obviously suppressed by both types of passive electromagnetic damper.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

[1] Ahrens, M., Kucera, L., 1996. Analytical Calculation of Fields, Forces and Losses of a Radial Magnetic Bearing with a Rotating Rotor Considering Eddy Currents. 5th International Symposium on Magnetic Bearing, Japan, p.253-258.

[2] El-Shafei, A., Hathout, J., 1993. Experimental and analytical investigation of hybrid squeeze film dampers. ASME Trans. on J. Eng. for Gas Turbine and Power, 115:353-359.

[3] Hahn, E.J., 1984. Squeeze Film Dampers in General Multi-Mass Rotor Bearing Systems, Part 1: Theory. Report 1984/AM/1, UNSW, Sydney.

[4] Jolly, M.R., Bender, J.W., Carlson, J.D., 1998. Properties and Applications of Magnetortheological Fluids. Proc. of SPIE-Int. Soc. Opt. Eng. SPIE, Washington, p.262-275.

[5] Kasarda, M.E.F., Mendoza, H., Kirk, R.G., Wicks, A., 2004. Reduction of subsynchronous vibrations in a single-disk rotor using an active magnetic damper. Mechanics Research Communications, 31(6):689-695.

[6] Noresson, V., Ohlson, N.G., Nilsson, M., 2002. Design of electrorheological dampers by means of finite element analysis: theory and applications. Materials and Design, 23(4):361-369.

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