Affiliations: [a] State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, Shaanxi, China | [b] Institute of Mechatronics and Information Systems, Xi'an Jiaotong University, Xi'an, Shaanxi, China
Correspondence:
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Corresponding author: Haipeng Geng, School of Mechanical Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an 710049, Shaanxi, China. Tel.: +86 2982 6691 60; E-mail:owen@stu.xjtu.edu.cn
Abstract: To meet the demands of high speed and excellent stability
in modern oil free turbomachinery, a hybrid foil-magnetic bearing (HFMB) was
first designed by Heshmat in 2000 [1]. However, in the HFMB, the journal
should be carried out in certain eccentricity and attitude angle to the
center of the bearing house due to hydrodynamic force which provided by the
GFB. While the magnetic force caused by the AMB would try to force the
journal of the reference position which is usually the center of the bearing
at all times when using a conventional PD controller. While magnetic forces
were commonly linearize at the center position of the bearing with respect
to journal displacement and coil current. Therefore, the fully nonlinear
force to displacement and the force to current characteristics concerning
the journal eccentricity effect should be applied. The main objective of
this paper is to represent a kind of theoretical method to calculate the
load capacity, dynamic stiffness and damping coefficients of the HFMB under
a specified load sharing factor λ with the predetermined
operational state.
Keywords: Hybrid foil-magnetic bearing, gas foil bearing, active magnetic bearing
