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Influence of the Support Conditions in the Modal Parameters of a Cantilever Beam

机译：支撑条件对悬臂梁模态参数的影响

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In modal analysis, previously to the modal testing, it is very common to assembly a finite element model, in order to know the frequency range of interest and the mode shapes of a structure. This information is very helpful for planning and developing the modal testing. On the other hand, the proper modeling of the support conditions and the joints are the main difficulties in model assembly and model updating. For these reasons, the results obtained in the modal tests are, sometimes, unexpected. In this paper it is studied the effect of the support conditions in the modal parameters of a steel cantilever beam with different kinds of foundations. Moreover, a technique based on the analysis of the singular value decomposition of the responses, using different number of sensors, is proposed and validated by experimental test carried out on a steel cantilever beam tested in the lab.
机译：在模态分析中，以前到了模态测试，它非常常见于组装有限元模型，以了解频率范围和结构的模式形状。此信息对规划和开发模态测试非常有帮助。另一方面，支持条件和关节的适当建模是模型装配和模型更新中的主要困难。由于这些原因，在模态测试中获得的结果有时意外。本文研究了用不同种类的基础钢悬臂梁模态参数对支撑条件的影响。此外，通过在实验室中测试的钢悬臂梁的实验试验提出并验证了基于分析响应的奇异值分解的奇异值分解的技术。

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