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Extraction of free body frequency response functions from flexibly constrained test

机译:从灵活约束测试中提取自由频率响应函数

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The traditional way of low stiffness suspension may no longer work for very large scale structures with extremely low first flexible natural frequency. In this paper, we replace the low stiffness suspension with a group of supports. After separate Frequency Response Function tests of the whole supported structure and the support structures, the influence of the supports could be removed from a later computation. To this end, the identification method and support design are critical. The existing substructure decoupling methods are briefly reviewed and some incomplete issues in the earlier works are discussed. Then the relationship among the methods is investigated. With these studies, some improvements on the pseudo-force method are made. The proper design of supports and measurement locations are also studied. Both numerical and experimental examples are described in the paper.
机译:低刚度悬架的传统方式可能不再适用于具有极低的第一挠性固有频率的超大型结构。在本文中,我们用一组支撑代替了低刚度悬架。在对整个支撑结构和支撑结构分别进行频率响应功能测试之后,可以从以后的计算中除去支撑的影响。为此,识别方法和支持设计至关重要。简要回顾了现有的子结构解耦方法,并讨论了早期工作中的一些不完整问题。然后研究了这些方法之间的关系。通过这些研究,对伪力法进行了一些改进。还研究了支架和测量位置的正确设计。本文描述了数值示例和实验示例。

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