Research on a new two-dimensional vibration measurement system developed from magnetic levitation technology

A novel vibration measurement model developed from magnetic levitation ball system was designed. The dynamics equation of this system model was deduced by decided correlation between movable displacement and the electromagnetic force of the levitation ball used. The correct two-dimensional vibration signals were acquired through standard vibrator testing experiments. The results show that the maximum absolute error is ± 0.3 Hz and relative error is in the range of ± 1.5 % to ± 0.25 % within measure scope of 20 Hz to 120 Hz, while, the maximum absolute error rises up to ± 1 Hz and relative error range is of ± 0.02 % to ± 0.82 % when measure scope is from 120 Hz to 5 kHz.