This paper deals with the problem of vibration quenching of the system with a limited power supply using a Hula-Hoop, and the results are compared with those reported in the automatic balancer. Following was made clear from the results of experiment and numerical analysis: (1) It is confirmed by the experiment and the approximate analysis using the averaging method that the self-excited vibration such as the one observed in automatic balancer is not capable of generating in this vibration quenching device using a Hula-Hoop. Moreover, considering the characteristic of this device below the resonant frequency, this device is superior to the automatic balancer. (2) This device is very effective in the region exceeding the resonant frequency of the system. (3) Both vibration quenching and energy saving are able to be established by using the bearing with small rotating resistance for Hula-Hoop. (4) The experimental and the numerical results were in good qualitative agreement with each other.
