单向双轴振动台与结构相互作用的影响及补偿

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摘要

为研究单向双轴振动台与结构的相互作用，建立了振动台与结构的传递函数矩阵(TFM)，研究了结构与振动台的质量比，结构的阻尼比、频率，以及结构与振动台的转动惯量比对传递函数矩阵的影响。结果表明：质量比、阻尼比和频率产生的影响集中在结构自振频率及周围的频段，而转动惯量比产生的影响位于油注共振频率及周围的频段；在相互作用影响的频段范围内，振动台的控制性能出现了不同程度的下降。基于以上研究，提出了一种实时补偿的控制策略，采用所提出的控制策略后，相互作用在频域的影响被完全地补偿；时域随机波的波形相关系数提升37.90%，误差的均方根值下降72.56%，振动台的控制性能得到很大的提升。

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	王巨科1
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	李小军1
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	李芳芳3
	李娜1
	张斌1

关键词 ：单向双轴振动台, 控制与结构的相互作用, 结构特性, 影响研究, 实时补偿

Abstract：

A transfer function matrix (TFM) from shaking table to structure was established to study the interaction effect between a unidirectional twin-axes shaking table and the tested structure.The effects of the mass ratio between the structure and shaking table, the damping ratio and frequency of the structure, and the moment of inertia ratio between the structure and shaking table on the TFM were investigated.The results show that the mass ratio, damping ratio, and frequency affect the TFM at the natural frequency of the structure and in its surrounding frequency band, while the moment of inertia ratio exerts influence on the TFM at the oil resonance frequency and in its surrounding frequency band.The control performance of the shaking table is reduced with some degree in the affected frequency range.Based on the above research, a real-time compensation control strategy was proposed.With the application of the proposed strategy, the interaction effect is completely compensated in frequency domain, the time waveform correlation coefficient of a random wave is improved by 37.90% and the root mean value of the error is reduced by 72.56% in time domain.The control performance of the shaking table is greatly improved.

Key words： unidirectional twin-axes shaking table control-structure interaction structural characteristics influence research real-time compensation

收稿日期: 2019-11-06 出版日期: 2021-05-28

引用本文:

王巨科1,2，李小军1,2，李芳芳3，李娜1，张斌1. 单向双轴振动台与结构相互作用的影响及补偿[J]. 振动与冲击, 2021, 40(10): 140-149.
WANG Juke1,2，LI Xiaojun1,2，LI Fangfang3，LI Na1，ZHANG Bin1. Effect and compensation of the interaction between a unidirectional twin-axis shaking table and the tested structure. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(10): 140-149.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I10/140

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