Parametric Study on the Dynamic Interaction of a Centrifugal Shaker and Bucket: Fid-Bau Portal

Parametric Study on the Dynamic Interaction of a Centrifugal Shaker and Bucket

Wang, Yongzhi / Hai, Wang / Yuan, Xiaoming

Differing from common vibration testing facilities, bucket with limited mass and stiffness is used as reaction of centrifugal shaker to trigger reduced scale earthquakes. Dynamic interaction between centrifuge shaker and bucket is inevitably generated as a crucial issue for centrifugal shaker development, especially large scale. Based on the robust control strategy and general design of 1-D centrifugal shaker, an equivalent mathematic model for centrifugal shakers was developed and the corresponding transfer function was derived for analyzing the dynamic interaction of centrifugal shaker and bucket. A series of numerical analysis using the transfer function was performed to understand the influence of main parameters of bucket on the performance of centrifugal shaker through the dynamic interaction. A visible oscillation was observed around the first modal frequency of bucket. The results show that increases in the mass ratio or damping ratio of bucket are effective means to mitigate the oscillation, and the recommended parameter values are 4 and 0.1, respectively. The developed model and analyzed results provide references for optimal facility design and numerical simulation of dynamic centrifuge tests.