抄録
This research investigates nonlinear dynamics of a beam supported at its both ends by electromagnetic forces from High-Tc Superconducting bulks. Experimental results show some resonance of an asymmetric mode consisting of pitch motion and deflection, which does never get excited in a symmetric linear system. It is a kind of parametric resonance. It shows soft-spring response: as the amplitude increases, the resonant frequency becomes small. Numerical results also show parametric resonance of the asymmetric mode. Mechanism of this resonance was discussed from nonlinear coupling of the eigenmodes.
