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Keywords: magnetic bearings
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Journal Articles
Article Type: Research-Article
J. Vib. Acoust. October 2014, 136(5): 051006.
Paper No: VIB-13-1358
Published Online: July 25, 2014
... of the external forces ( F ext ) that include disturbance forces F disturbances and unbalance forces F b , the contribution of the seals ( F seals ) and the contribution of the magnetic bearings ( F AMB ). In steady-state conditions, or for small speed variation, the angular acceleration φ...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. April 2012, 134(2): 021018.
Published Online: January 26, 2012
... occur across a small radial clearance in one transverse plane. A single radial active magnetic bearing is used to apply control forces in a separate transverse plane. The experiments confirm the conditions under which static feedback of the measured interaction force can prevent degenerate whirl...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. October 2011, 133(5): 051005.
Published Online: July 26, 2011
... representations of the compression system dynamics are compared with the measured response of the experimental setup. Employing active magnetic bearings to perturb the axial impeller tip clearance of the compressor, the compression system is excited over a wide frequency range and the input-output response from...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. December 2010, 132(6): 061005.
Published Online: September 16, 2010
... frequency ω H are experimentally identified. Also, the servo dynamics of the magnetic bearing that controls the axial impeller position is determined experimentally. To further validate the mathematical model and the feasibility of using the impeller tip clearance for controlling surge, we present a design...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. October 2009, 131(5): 051006.
Published Online: September 10, 2009
...Hongchang Wang; Shuyun Jiang; Zupei Shen Active magnetic bearings and superconducting magnetic bearings were used on a high-speed flywheel energy storage system; however, their wide industrial acceptance is still a challenging task because of the complexity in designing the elaborate active control...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. June 2009, 131(3): 031009.
Published Online: April 22, 2009
...M. Kamel; H. S. Bauomy The rotor-active magnetic bearing system subjected to a periodically time-varying stiffness having quadratic and cubic nonlinearities is studied and solved. The multiple time scale technique is applied to solve the nonlinear differential equations governing the system up...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. June 2009, 131(3): 031002.
Published Online: April 7, 2009
...Tsuyoshi Inoue; Yukio Ishida; Takeshi Tsumura This study focuses on the vibration of the rotor supported by a repulsive-type passive magnetic bearing. It evaluates the restoring force of a repulsive magnetic bearing numerically by considering the effects of magnetic anisotropies of the inner...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. December 2008, 130(6): 061007.
Published Online: October 15, 2008
... (quasistatic conditions). Similar studies were performed in Ref. 8 . 07 02 2008 12 07 2008 15 10 2008 damping electromagnetic induction machine bearings magnetic bearings rotors stability eddy current induction bearing rotordynamics stability electromechanical...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. October 2007, 129(5): 550–558.
Published Online: February 2, 2007
... be applied by magnetic bearings to reduce the effective synchronous forcing which is driving the contact, so that the rotor can progress to a contact free orbit. It is shown that even in the presence of highly nonlinear contact dynamic effects, a linear finite element rotor model can be used to calculate...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. June 2007, 129(3): 317–322.
Published Online: November 8, 2006
...Robert J. Prins; Mary E. F. Kasarda; Samantha C. Bates Prins Locating the effective rotor origin of an active magnetic bearing (AMB) is an important step toward accurate characterization of the bearing air gaps for field tuning, performance analyses, and some shaft force measurement techniques...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. April 2007, 129(2): 230–238.
Published Online: October 5, 2006
...Naohiko Takahashi; Hiroyuki Fujiwara; Osami Matsushita; Makoto Ito; Yasuo Fukushima In active magnetic bearing (AMB) systems, stability is the most important factor for reliable operation. Rotor positions in radial direction are regulated by four-axis control in AMB, i.e., a radial system...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. October 2006, 128(5): 646–652.
Published Online: February 14, 2006
...Y. A. Amer; M. H. Eissa; U. H. Hegazy; A. S. Sabbah The dynamical behavior of a parametrically excited simple rigid disk-rotor supported by active magnetic bearings (AMB) is investigated, without gyroscopic effects. The principal parametric resonance case is considered and studied. The motion...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. October 2006, 128(5): 653–665.
Published Online: February 7, 2006
... rotor system incorporating two radial magnetic bearings, with standard proportional-integral-derivative control employed in a parallel feedback loop for rotor levitation. An experimental investigation of controller performance is used to deduce the best choice of wavelet basis for various operating...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. June 2006, 128(3): 269–281.
Published Online: December 2, 2005
...Guoxin Li; Zongli Lin; Paul E. Allaire; Jihao Luo This paper reports on the modeling and experimental identification of a high speed rotor-magnetic bearing test rig. An accurate nominal model and an uncertainty representation are developed for robust controller synthesis and analysis. A combination...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. August 2005, 127(4): 362–369.
Published Online: December 16, 2004
...J. C. Ji; Colin H. Hansen This paper is concerned with a study of the influence of a time delay occurring in a PD feedback control on the dynamic stability of a rotor suspended by magnetic bearings. In the presence of geometric coordinate coupling and time delay, the equations of motion governing...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. July 2003, 125(3): 307–316.
Published Online: June 18, 2003
...Y. S. Ho; H. Liu; L. Yu This paper is concerned with the effect of a thrust active magnetic bearing (TAMB) on the stability and bifurcation of an active magnetic bearing rotor system (AMBRS). The shaft is flexible and modeled by using the finite element method that can take the effects of inertia...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. July 2002, 124(3): 359–366.
Published Online: June 12, 2002
...Uhn Joo Na, Research Engineer; Alan B. Palazzolo, Professor; Andrew Provenza This paper provides a new algorithm and test verification for implementing fault-tolerant operation of magnetically suspended, flexible shaft, rotating machinery. The currents to the magnetic bearing are redistributed...
Journal Articles
Article Type: Technical Briefs
J. Vib. Acoust. July 2002, 124(3): 460–464.
Published Online: June 12, 2002
... and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS . Manuscript received May 2001; revised March 2002. Associate Editor: G. Flowers. 01 May 2001 01 March 2002 12 06 2002 resonance magnetic bearings machine bearings rotors chaos nonlinear dynamical systems...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. July 2000, 122(3): 209–221.
Published Online: January 1, 2000
...Uhn Joo Na, Research Associate; Alan Palazzolo, Professor Flux coupling in heteropolar magnetic bearings permits remaining active coils to assume actions of failed coils to produce force resultants identical to the un-failed actuator. This fault-tolerant control usually reduces load capacity...