Damage detection approach based on the second derivative of flexibility estimated from incomplete mode shape data

Lee, Eun-Taik; Eun, Hee-Chang

doi:10.1016/j.apm.2017.02.014

Cited by 11 publications

(2 citation statements)

References 9 publications

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“…Hsu et al [39] proposed a method for detecting damage for rotating wind turbine blades, which used a local flexibility method based on dynamic strain signals measured via long-gauge fiber Bragg grating (FBG) sensors. Lee and Eun [40] extended incomplete measurement data to construct the flexibility matrix of a damaged structure. They found that the updated flexibility matrix could extract more information about the structural health status.…”

Section: Localization Of Damage Using Flexibility-derived Indicesmentioning

confidence: 99%

Structural Damage Detection Based on Static and Dynamic Flexibility: A Review and Comparative Study

Peng,

Yang,

Qin

et al. 2023

Coatings

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Material damage in structures must be detected in a timely manner to prevent engineering accidents. Damage detection based on structural flexibility has attracted widespread attention in recent years due to its simplicity and practicality. This article provides a detailed overview of damage detection methods based on structural flexibility. Depending on the calculation method and data used, flexibility-based methods can be divided into the following categories: flexibility difference, flexibility derivative index, flexibility sensitivity, flexibility decomposition, static flexibility, and combinations of flexibility with other methods. The basic principles and main calculation formulas of various flexibility methods are explained, and their advantages and disadvantages are analyzed. For the method using flexibility difference, the advantage is that the calculation is very simple and does not require the construction of a finite element model of the structure. The disadvantage is that it requires the measurement of modal data of the intact structure, and this method cannot quantitatively assess the degree of damage. For the method using the flexibility derivative index, the advantage is that it only requires the modal data of the damaged structure to locate the damage, but this method is particularly sensitive to noise in the data and is prone to misjudgment. For methods based on flexibility sensitivity and flexibility decomposition, the advantage is that they can simultaneously obtain the location and degree of damage in the structure, but the disadvantage is that they require the establishment of accurate finite element models in advance. Static flexibility methods can compensate for the shortcomings of dynamic flexibility methods, but they usually affect the normal use of the structure during static testing. Combining flexibility-based methods with advanced intelligent algorithms and other methods can further improve their accuracy and efficiency in identifying structural damage. Finally, this article discusses the challenges that have not yet been solved among damage detection methods based on structural flexibility.

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Section: Localization Of Damage Using Flexibility-derived Indicesmentioning

confidence: 99%

Structural Damage Detection Based on Static and Dynamic Flexibility: A Review and Comparative Study

Peng,

Yang,

Qin

et al. 2023

Coatings

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“…Finally, the unique flexibility of FPCs allows them to be bent or curved to fit specific designs, but this bending should be carefully controlled 28 . Excessive curvature can impose undue stress on the material, increasing the risk of fatigue and damage over time 29 . Proper management of curvature is essential to maintain the structural integrity of the FPC.…”

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confidence: 99%

Mathematical modeling of flexible printed circuit configuration: a study in deformation and optimization

Meng,

Ding,

Khan

et al. 2024

Sci Rep

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This manuscript offers an exhaustive analysis of Flexible Printed Circuits (FPCs), concentrating on enhancing their design to surmount two primary challenges. Firstly, it seeks to obviate contact with proximate components. Secondly, it aspires to adhere to pre-established curvature constraints. Predicated on the curvature properties of FPCs, we have developed a model adept at accurately forecasting FPC deformation under diverse conditions. Our inquiry entails a thorough examination of various FPC configurations, including bell, 'U', and 'S' shapes. Central to our methodology is the strategic optimization of FPC spatial arrangements, aiming to avert mechanical interference and control curvature, thus mitigating mechanical strain. This dual-faceted strategy is pivotal in enhancing the durability and operational reliability of FPCs, particularly in contexts demanding elevated flexibility and precision. Our research offers essential insights into the refinement of FPC design, skillfully addressing the complexities associated with curvature and physical interaction. Collectively, this study advocates a comprehensive framework for the design and implementation of FPCs, significantly advancing the field of contemporary electronics by ensuring these components meet the evolving demands of the industry.

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On model-based damage detection by an enhanced sensitivity function of modal flexibility and LSMR-Tikhonov method under incomplete noisy modal data

Sarmadi

Entezami

Ghalehnovi

2020

Engineering with Computers

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Damage detection approach based on the second derivative of flexibility estimated from incomplete mode shape data

Cited by 11 publications

References 9 publications

Structural Damage Detection Based on Static and Dynamic Flexibility: A Review and Comparative Study

Structural Damage Detection Based on Static and Dynamic Flexibility: A Review and Comparative Study

Mathematical modeling of flexible printed circuit configuration: a study in deformation and optimization

On model-based damage detection by an enhanced sensitivity function of modal flexibility and LSMR-Tikhonov method under incomplete noisy modal data

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