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Received: 2002-08-29

Revision Accepted: 2002-11-21

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Journal of Zhejiang University SCIENCE A 2003 Vol.4 No.5 P.514-519


A disc-type magneto-rheologic fluid damper

Author(s):  ZHU Chang-sheng

Affiliation(s):  College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   cszhu@hotmail.com, zhu-zhang@zjuem.zju.edu.cn

Key Words:  Magneto-rheological fluid, Damper, Rotordynamics, Vibration, Active vibration control

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ZHU Chang-sheng. A disc-type magneto-rheologic fluid damper[J]. Journal of Zhejiang University Science A, 2003, 4(5): 514-519.

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A disc-type magneto-rheological fluid damper operating in shear mode is proposed in this paper, which is based on the special characteristics of the magneto-rheological (MR) fluid with rapid, reversible and dramatic change in its rheological properties by the application of an external magnetic field. The magnetic field of the disc-type MR fluid damper is analysed by the finite element method; the controllability of the disc-type MR fluid damper on the dynamic behaviour of a rotor system; and the effectiveness of the disc-type MR fluid damper in controlling the vibration of a rotor system, are studied in a flexible rotor system with an over-hung disc. It is shown that the magnetic flux density of the disc-type MR fluid damper in the working areas can significantly change with the applied current in the coil; and that the dynamic behavior of the disc-type MR fluid damper can be varied by the application of an external magnetic field produced by a low voltage electromagnetic coil. The disc-type MR fluid damper can significantly change the dynamic characteristics of a rotor system, provided that the location of the disk-type MR fluid damper is carefully chosen. The disc-type MR fluid damper is a new actuator with good dynamic characteristics for rotating machinery.

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