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实时子结构试验将易于建模部分进行数值仿真,剩余部分进行物理试验,从而间接增强了既有设备的试验能力。加载系统与试验试件动力特性的耦合是影响子结构系统稳定性的关键问题。现有稳定性分析方法忽略了其耦合效应对稳定性分析精度的影响。该文建立了作动器、振动台与物理试件间的动力耦合模型,建立了可考虑耦合动力特性的稳定性分析方法,通过试验与理论分析验证了该方法的准确性。基于该方法分别讨论了试件-加载系统相互作用对基于作动器和振动台的子结构试验系统稳定性影响。分析结果表明:试件-加载系统相互作用在不同条件对子结构试验系统稳定性会不同程度的降低或提高,需要特别考虑。
Real-time substructure test will be easy to model part of the numerical simulation, the remaining part of the physical test, thus indirectly enhancing the test capabilities of existing equipment. Coupling of the dynamic characteristics of the loading system and the test specimen is a key issue affecting the stability of the substructure system. The existing stability analysis methods ignore the influence of the coupling effect on the stability analysis stability. In this paper, the dynamic coupling model between actuator, shaker and physical specimen is established, and the stability analysis method which can consider the coupling dynamic characteristics is established. The accuracy of this method is verified by experimental and theoretical analysis. Based on this method, the influence of specimen-loading system interaction on the stability of substructure test system based on actuator and shaker is discussed respectively. The analysis results show that the stability of the substructure test system will be reduced or improved under different conditions under the different conditions of specimen-loading system interaction, which requires special consideration.