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Seismic modal identification using a new approach based on weighted transmissibility

机译：使用基于加权传递性的新方法的地震模态识别

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摘要

In recent years, the transmissibility-based operational modal analysis has attracted the attention of many researchers due to its effective applications in output-only modal identification. However, the present research indicates that the application of this approach is not so appropriate for the ambient vibration records with short length and high spectral leakage, such as seismic records. The existence of nonperiodic frequency components in the records leads to an increase in the spectral leakage and dispersion. In this paper, an effective approach called weighted transmissibility-based operational modal analysis is proposed to properly identify the structural modal parameters using the seismic records. The proposed method identifies the natural frequencies and mode shapes based on weighed transmissibility, so that it combines the single-reference weighted transmissibility functions associated with different transferring outputs obtained from single or multiple loading conditions in a unique matrix formulation. Then, it extracts the vibration modes using the efficient spectra obtained from the singular value decomposition of weighted transmissibility matrices. In this paper, a theoretical example (5DOF system) is provided to indicate the capabilities of the proposed approach for identifying the modal parameters of structural systems.
机译：近年来，由于其仅产出模态识别中的有效应用，基于传导性的操作模态分析引起了许多研究人员的注意。然而，本研究表明，这种方法的应用不适合具有短长度和高光谱泄漏的环境振动记录，例如地震记录。记录中的非周期性频率分量的存在导致光谱泄漏和分散的增加。在本文中，提出了一种称为加权传播性的操作模态分析的有效方法，以适当地使用地震记录识别结构模态参数。所提出的方法识别基于权重的传输性的自然频率和模式形状，使得它结合了与从单个或多个加载条件中获得的不同传送输出相关联的单参考加权传输功能，以唯一的矩阵制构。然后，它使用从加权传输矩阵的奇异值分解获得的有效光谱提取振动模式。在本文中，提供了理论示例（5dof系统）以指示识别结构系统模态参数的所提出方法的能力。

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