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

INFLUENCE OF CRITICAL CURRENT DENSITY ON MAGNETIC FORCE OF HTSC BULK ABOVE PMR WITH 3D-MODELING NUMERICAL SOLUTIONS

2011 ◽  
Vol 25 (19) ◽  
pp. 2525-2532 ◽  
Author(s):  
YIYUN LU ◽  
BINGJUAN LU ◽  
YUNWANG GE ◽  
WENQING CHEN
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
3D Modeling ◽  
Magnetic Force ◽  
Numerical Solutions ◽  
Magnetic Levitation ◽  
High Temperature Superconductors ◽  
Levitation System ◽  
Superconducting Levitation

Numerical electromagnetic field simulations of high-temperature superconductors (HTSC) bulk were carried out to calculate the magnetic force between the HTSC bulk and the permanent magnet railway (PMR). A 3D-modeling numerical calculation method is proposed using the finite element method. The model is formulated with the magnetic field vector (H-method). The resulting code was written with FORTRAN language. The electric field intensity E and the current density J constitutive relation of HTSC were described with E–J power law. The Kim macro-model is used to describe critical current density Jc of HTSC bulk. Two virtual HTSC bulks were used to solve the critical current density Jc anisotropic properties of HTSC materials. A superconducting levitation system composed of one HTSC bulk and PMR is successfully investigated using the proposed method. By this method, the influence of critical current density on magnetic levitation force of the superconducting levitation system is mathematically studied.

Sign in / Sign up

Export Citation Format

Share Document