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Abstract: Using
magnetorheological(MR) fluid in place of lubricating oil in a normal
squeeze film damper(SFD) can build a damping-variable SFD controlled by
magnetic field, used to control the vibration of rotor systems. The
Reynolds equation of MR fluid squeeze film and its resolution are
derived based on the Bingham model, and the calculating formulas for
flowing velocity, pressure distribution, reaction force of the squeeze
film and the magnetic pull force inside the damper are presented. Using
a rigid rotor supported on the MR fluid SFDs as an example, the
mechanical properties of the squeeze film and the unbalance response
characteristics of the rotor system are analyzed theoretically. A
squeeze mode MR fluid damper used for rotor vibration control is
designed and manufactured, and the unbalance response properties and
control method of a single-disk flexible rotor system supported by the
damper are studied experimentally. The study shows that the magnetic
pull force can decrease both the first critical speed and the critical
amplitude. The oil film reaction force can decrease the amplitude at the
undamped critical speeds and increase the damped critical speed. The
damper may have the best effect to make the vibration minimize within
the range of all working speed by using on-off control method.
Key words: Magnetorheological
fluids Squeeze film damper Rotor Vibration control
CLC No: TH113
O328
国家自然科学基金(19972054)和广东省自然科学基金(990839)资助项目.
Received 20030122, received in revised form 20030425
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