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Development of residual operational deflection shape for crack detection in structures

机译：开发用于结构裂缝检测的残余工作挠度形状

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摘要

Excitation of a cracked structure at a frequency always generates higher harmonic components of the exciting frequency due to the breathing of the crack. In this paper, the deflection of cracked structures at the exciting frequency and the second harmonic component is mapped by a new method based on the operational deflection shape (ODS) for the purpose of crack detection. While the ODS is helpful in understanding dynamic behaviour of structures and machines, it is not always possible to determine the location of cracks in structures or machines based on the ODS itself. Therefore, a new concept called residual ODS (R-ODS) has been defined for crack detection in beam-like structures. This paper presents the details of the proposed method and its results when applied to numerical and experimental examples.
机译：由于裂纹的呼吸，在一定频率下激励破裂的结构始终会产生激励频率的高次谐波分量。本文基于工作挠度形状（ODS），通过一种新方法绘制了裂纹结构在激振频率和二次谐波分量下的挠度，以进行裂纹检测。虽然ODS有助于理解结构和机器的动态行为，但并非总是可能基于ODS本身确定结构或机器中裂纹的位置。因此，已经定义了一种称为残留ODS（R-ODS）的新概念，用于检测梁状结构中的裂缝。本文介绍了该方法的细节及其在数值和实验实例中的应用结果。

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