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首页> 外文会议>International Conference on Uncertainty in Structural Dynamics >Localisation, characterisation and Identification of localised nonlinearity in structural dynamics using base excitation frequency response functions
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Localisation, characterisation and Identification of localised nonlinearity in structural dynamics using base excitation frequency response functions

机译：基于励磁频率响应函数的结构动态中局部非线性的本地化，表征和识别

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Identification of structural nonlinearities has been of great interest over recent decades. In addition, due to high cost and time requirements, it is not practical to have complete experimental measurements. This study is initially focused on the localisation of structural nonlinearities using an approach based on spatially incomplete experimental frequency domain data from a structural vibration test. A cantilever beam with a nonlinear restoring force is considered under stepped-sine base excitation. An updated linear finite element model and the Craig-Bampton reduction method is used to obtain the reduced nonlinear forces (RNFs) in the measured region, leading to the location decision for nonlinear elements. Then, the Equivalent Dynamic Stiffness Mapping technique is used for characterization and mathematical modelling of the unknown nonlinearities. This technique utilizes the ratio of internal forces and the displacement response of the unknown elements (F/X) in the frequency domain as the Equivalent Dynamic Stiffness.
机译：近几十年来说，结构非线性的鉴定对近几十年来说非常兴趣。此外，由于高成本和时间要求，具有完整的实验测量并不实用。本研究首先使用基于结构振动测试的空间不完全实验频域数据的方法来集中于结构非线性的定位。在阶梯式正弦励磁下考虑具有非线性恢复力的悬臂梁。更新的线性有限元模型和CRAIG-Bampton还原方法用于获得测量区域中的减少的非线性力（RNF），导致非线性元件的位置决定。然后，等效动态刚度映射技术用于未知非线性的表征和数学建模。该技术利用内部力与频域中未知元件（F / X）的比率和等同的动态刚度。

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