Damage detection in plate-like structures using High-Order mode shape derivatives

M. Abdo
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引用次数: 16

Abstract

This paper investigates the application and reliability of using high-order mode shape derivatives especially, the fourth derivative in damage detection of plate-like structures. Numerical analyses have been carried out for low- and high-order mode shapes of simply supported and cantilever steel plate models. Six scenarios of damages are studied for plate models to represent different damage characteristics. The influence of artificial noise on the damage identification using changes in fourth derivative of mode shapes has been investigated. Based on the numerical studies, it is shown that the fourth derivative of mode shape is promising in detecting and locating structural damage in plate-like structures since it is localized at the damage locations even for a small amount of damage using only one of the mode shapes. Both low- and high-order mode shapes give successful results. Also, damage indices of the fourth derivatives give smoother localization and consequently better damage identification than those of curvature of mode shapes. Furthermore, using high-order modes (which can be measured by advanced sensors) does not improve the results of damage identification using the fourth derivative. Unfortunately, damage detection using changes in fourth derivative of mode shapes is sensitive to measurement noise.
基于高阶振型导数的类板结构损伤检测
研究了高阶振型导数特别是四阶振型导数在类板结构损伤检测中的应用及可靠性。对简支和悬臂钢板模型的低阶和高阶振型进行了数值分析。研究了板模型的六种损伤情景,以表示不同的损伤特征。研究了人工噪声对利用振型四阶导数变化进行损伤识别的影响。数值研究表明,在类板结构中,模态振型的四阶导数即使只使用一种模态振型进行少量损伤,也能定位在损伤位置,因此在检测和定位结构损伤方面具有广阔的应用前景。低阶和高阶模态振型都能给出成功的结果。与模态振型曲率相比,四阶导数损伤指标的局部化更平滑,损伤识别效果更好。此外,使用高阶模态(可以由先进的传感器测量)并不能改善使用四阶导数进行损伤识别的结果。不幸的是,利用模态振型四阶导数的变化进行损伤检测对测量噪声很敏感。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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