振动台与偏心负载相互作用的机理研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (3) : 330-338.

论文

振动台与偏心负载相互作用的机理研究

王巨科1，李小军2，刘爱文1，陈苏2，傅磊1，李芳芳3

作者信息 +

Mechanism of interaction between shaking table and eccentric load

WANG Juke1, LI Xiaojun2, LIU Aiwen1, CNEN Su2, FU Lei1, LI Fangfang3

Author information +

文章历史 +

摘要

为研究振动台与偏心负载的相互作用机理，构建了振动台与偏心负载的传递函数矩阵，研究了负载与振动台的质量比、转动惯量比，以及负载重心和激振器分别至振动台台面中心距离的比（偏心距离比）对传递函数矩阵的影响。结果表明：质量比对传递函数矩阵的影响最大，偏心距离比次之，转动惯量比最小。由于振动台-负载相互作用的影响，振动台的有效工作频段下降了71.13%，两激振器间的耦合作用被放大了至少37.15倍。基于以上研究，提出了一种实时补偿控制策略的拓展形式，并分别从频域和时域角度分析了所提策略的有效性。分析表明：两个激振器复现地震动记录的波形相关系数分别提升了14.04%和4.78%，所提出的控制策略能够很好地补偿振动台与偏心负载间的相互作用。

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.

导出引用

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[J]. Journal of Vibration and Shock, 2023, 42(3): 330-338

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