Host: The Japan Society of Mechanical Engineers
Name : Dynamics and Design Conference 2019
Date : August 27, 2019 - August 30, 2019
It is known that the dynamic absorber is affective at the specific frequency, but is ineffective in the other frequency band. Taking advantage of the fact that the natural frequency is determined by the stiffness of the dynamic absorber, switching of the stiffness is performed to change the stiffness of the dynamic absorber to prevent resonance and device semi-active control that suppresses the vibration. In prior research, the mechanism of the variable stiffness was achieved by combination and the release of two pairs of springs with a rack gear, however, there was a problem of "the occurrence of acceleration disturbance." In order to improve the problem, a variable stiffness mechanism is realized by using an elastic body instead of the rack gear. For the semi-active control on the bases of the frequency of the structure, the measurement of the vibration frequency in the real time was necessary. It was measured by a suitable filter in prior research. In this paper, the time response of the structure of the several steps ahead is predicted and semi-active control is realized by choosing the stiffness with much dissipation of the kinetic energy. The effect of the proposed semi-active control is verified by simulation and an experiment.
