<技術報告>新遠心力載荷装置の振動特定に関する詳細調査

Abstract

The geotechnical centrifuge at the Disaster Prevention Research Institute, Kyoto University was renewed two years ago. Consequently, the rigidity of the main frame of the device had improved. However, some problems emerged by subsequent use. The 1st problem was that the rigidity of the platform part of the device was low. The 2nd one was that the fixed system of the platform part adopted did not function. The 3rd one was that vibration of the up-and-down direction in the shaking table occurs when dynamic centrifuge tests were. In order to solve those problems, the platform part was renewed last year to what has high rigidity, and the fixed system was also changed. In the present study, we investigated the dynamic characteristics of the shaking table and the platform part by measuring the vibration when dynamic centrifuge tests were. As a result, it was found that the causes of vibration of the up-and-down direction were the structure of the shaking table and the control signal called "DITHER". Additionally, it compared with the result when not fixing a platform part. Based on the comparison results, it is suggested that it be used without fixing the platform part.