Mechanism of interaction between shaking table and eccentric load
WANG Juke1, LI Xiaojun2, LIU Aiwen1, CNEN Su2, FU Lei1, LI Fangfang3
1.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;
2.Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit, Beijing University of Technology, Beijing 100124, China;
3.Tianjin Key Laboratory of Civil Structure Protection and Reinforcing, Tianjin Chengjian University, Tianjin 300384, China
Abstract： A transfer function matrix (TFM) is established to study the interaction mechanism between shaking table and eccentric load. The effects of mass ratio between eccentric load and shaking table, the moment of inertia ratio between eccentric load and shaking table, and the ratio of the distance from the center of gravity of load to the center of the shaking table to the distance from the exciter to the center of shaking table (eccentric distance ratio) on the TFM are investigated. The results show that the TFM is most sensitive to the change of the mass ratio, followed by the eccentric distance ratio and the moment of inertia ratio. Under the influence of the interaction between the shaking table and eccentric load, the effective frequency band of the shaking table decreases 71.13%, and the coupling between two exciters is amplified at least 37.15 times. Based on the above research, an extended form of real-time feedback control compensation strategy is proposed, and the effectiveness validation of the strategy in both frequency and time domain are conducted. The results show that the correlation coefficient of ground motion record of two exciters is improved by 14.04% and 4.78% respectively, and the strategy can compensate the interaction between shaking table and eccentric load effectively.
王巨科1，李小军2，刘爱文1，陈苏2，傅磊1，李芳芳3. 振动台与偏心负载相互作用的机理研究[J]. 振动与冲击, 2023, 42(3): 330-338.
WANG Juke1, LI Xiaojun2, LIU Aiwen1, CNEN Su2, FU Lei1, LI Fangfang3. Mechanism of interaction between shaking table and eccentric load. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(3): 330-338.
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