Abe Naoto    Department   Undergraduate School  , School of Science and Technology    Position   Professor
Date	2014/08/27
Presentation Theme	Semi-active synamic aborber by variable stiffness mechanism using the air sylinder
Conference	Dynamics and Design Conference 2014
Promoters	The Japan Society of Mechanical Engineers
Conference Type	Workshop/Symposium
Presentation Type	Speech (General)
Contribution Type	Collaborative
Venue	Sophia University Yotsuya Campas
Publisher and common publisher	Naoki Syuto, Naoto Abe
Details	Given the frequency of seismic waves close to the resonant frequency of the structure, the structure causes a large vibration. As a method to shift the resonance frequency, the dynamic absorber using the additional mass is known well. The dynamic absorber is an effective method to suppress at the specific frequency. However, the frequency band which can demonstrate the effect of the dynamic absorber is restrictive, and it seems that the semi-active control is more effective. The resonance frequency depends on the stiffness according to the principle of a dynamic absorber. Therefore, it is aimed for the vibration suppression of the wide frequency band using the dynamic absorber which realized a variable stiffness mechanism by a pair of conic spring and pre-compression displacement. In prior research, there was a problem of "taking time in the variable mechanism of the displacement using the rack & pinion with a DC motor." In order to improve the problem, variable stiffness mechanism is realized using the air cylinder which is quick in movement as an actuator. The stiffness of the dynamic absorber is changed according to the frequency of the structure, and it is verified that the effect of the semi-active control by simulations and vibration experiments with some seismic waves.