208 Reduction of a Parametric Resonance in a High-Tc Superconducting Levitation System by a Vibration Absorber Linearly Coupled with a Main System

2012 ◽  
Vol 2012 (0) ◽  
pp. _208-1_-_208-10_
Author(s):  
Toyoki TAKAZAKURA ◽  
Ryunosuke SAKAGUCHI ◽  
Toshihiko SUGIURA
Keyword(s):  
Parametric Resonance ◽  
Vibration Absorber ◽  
High Tc ◽  
Main System ◽  
Levitation System ◽  
Superconducting Levitation

Reduction of a Parametrically Excited Horizontal Oscillation in a High-Tc Superconducting Levitation System

2012 ◽  
Author(s):  
Ryunosuke Sakaguchi ◽  
Toshihiko Sugiura
Keyword(s):  
Magnetic Levitation ◽  
Vertical Motion ◽  
Vibration Absorber ◽  
Parametrically Excited ◽  
High Tc ◽  
Vertical Excitation ◽  
Levitation System ◽  
Horizontal Oscillation ◽  
Damped Systems ◽  
Superconducting Levitation

This research proposes reduction in the amplitude of nonlinear oscillation in a high-Tc superconducting magnetic levitation system by using a vibration absorber. High-Tc superconducting levitation systems have very low damping and stable levitation without control. However in such low-damped systems, complicated phenomena of dynamics can be easily generated by nonlinearity of the magnetic force. Our previous research showed that, when the frequency of vertical excitation is in the neighborhood of double the natural frequency in the horizontal direction, horizontal oscillation can occur parametrically through nonlinear coupling between vertical motion and horizontal motion. This research discusses on effect of a vibration absorber on a parametrically excited horizontal oscillation of the levitated body. The numerical results showed reduction in the amplitude of the horizontal oscillation. This kind of vibration absorber can be useful for reducing the amplitude of the autoparametric resonance of a high-Tc superconducting levitation system.

scholarly journals Vibration reduction using autoparametric resonance in a high-Tc superconducting levitation system

2014 ◽  
Vol 507 (3) ◽  
pp. 032045
Author(s):  
Hiroshi Yamasaki ◽  
Toyoki Takazakura ◽  
Ryunosuke Sakaguchi ◽  
Toshihiko Sugiura
Keyword(s):  
Vibration Reduction ◽  
High Tc ◽  
Autoparametric Resonance ◽  
Levitation System ◽  
Superconducting Levitation

Numerical method to the excited high-Tc superconducting levitation system above the NdFeB guideway

2006 ◽  
Vol 42 (4) ◽  
pp. 947-950 ◽  
Author(s):  
Jun Zheng ◽  
Honghai Song ◽  
Jiasu Wang ◽  
Suyu Wang ◽  
Minxian Liu ◽  
...  
Keyword(s):  
Numerical Method ◽  
High Tc ◽  
Ndfeb Guideway ◽  
Levitation System ◽  
Superconducting Levitation

Nonlinear Active Cancellation of the Parametric Resonance in a Magnetically Levitated Body

2004 ◽  
Vol 126 (3) ◽  
pp. 433-442 ◽  
Author(s):  
Hiroshi Yabuno ◽  
Ryo Kanda ◽  
Walter Lacarbonara ◽  
Nobuharu Aoshima
Keyword(s):  
Parametric Resonance ◽  
Degrees Of Freedom ◽  
Control Method ◽  
Inertial Force ◽  
Phase Lock Loop ◽  
Vibration Absorber ◽  
Control Input ◽  
Main System ◽  
Magnetically Levitated ◽  
Active Control Strategy

An active control strategy for the stabilization of parametric resonance in a magnetically levitated body is proposed. The characteristic feature of the strategy is the exploitation of the nonlinear effect of the inertial force associated with the motion of a pendulum-type vibration absorber driven by an appropriate control torque. As a distinguished feature, the proposed control method does not rely on the effective autoparametric energy transfer between the main system and the absorber. Because the main system is not linearly coupled with the absorber, the drawback inherent in the increase of the system degrees of freedom (i.e., the increase of the linear vibrational mode for the main system due to the attachment of the absorber) is overcome. The effective frequency and amplitude of the pure-tone control input—the torque driving the vibration absorber—are designed so that the nonlinear action of the pendulum on the main system counteracts the effect of the resonant parametric excitation. The effectiveness of the theoretically proposed control method is experimentally validated using an apparatus that comprises a phase-lock loop system.

Bifurcation and multifractal vibration in dynamics of a high-Tc superconducting levitation system

1997 ◽  
Vol 231 (3-4) ◽  
pp. 217-223 ◽  
Author(s):  
Takashi Hikihara ◽  
Tomoya Fujinami ◽  
Francis C. Moon
Keyword(s):  
High Tc ◽  
Levitation System ◽  
Superconducting Levitation
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