Crack Detection Using Mixed Axial and Bending Natural Frequencies in Metallic Euler-Bernoulli Beam

Mostafa, Maged; Tawfik, Mohammad

doi:10.1590/1679-78252640

Cited by 6 publications

(6 citation statements)

References 34 publications

(38 reference statements)

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“…SOLID187 (10 noded tetrahedral 3-D element with three degree of freedom at each node), is used to mesh column, nut and bolts [17] and SHELL181 (4 noded 2-D element with six degree of freedom at each node) is used to mesh plates (flange and web plate) of the spliced column.…”

Section: Finite Element Modelmentioning

confidence: 99%

Static and Dynamic Analyses of Spliced Column

Singh¹

2021

Sound&Vibration

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The analysis of spliced column has been carried out to detect optimum location of providing splices in the column. In the present work, static and dynamic (free vibration) analyses of spliced column have been done by randomising the location of splicing. A symmetrical four storey steel framed building has been modelled, analysed and designed for loads (dead, live and earthquake loads) recommended by Indian Codal provisions using Staad.Pro. The critical column at each floor level is identified based on axial force (AF), bending moment (BM) and shear force (SF). The total 16 models of spliced columns have been designed and then modelled in a 3D CAD Design tool (SOLID-WORKS) and then imported in the finite element tool (ANSYS Workbench 14.0) for detailed analysis. The variation of stress, strain and deflection of the spliced column are shown in the form of contour. Further, the modal analysis is performed to determine the natural frequencies. The results of static and dynamic analyses are compared for each modelled spliced column to obtain the optimum location for providing splices in the column. The dynamic analysis of spliced column is of utmost importance in the region where dynamic loadings like earthquake, cyclones etc. are more frequent, and mere static analysis does not account for the safety of the structure. This study will help the engineers to select directly the optimum size and location of the splices in the column of a steel framed building.

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Section: Finite Element Modelmentioning

confidence: 99%

Static and Dynamic Analyses of Spliced Column

Singh¹

2021

Sound&Vibration

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“…These advancements have served as a catalyst for the emergence and adoption of diverse SHM approaches and methodologies, spanning from conventional methods like visual inspection and manual monitoring to cutting-edge techniques that leverage advanced sensors, wireless communication, and machine learning algorithms. These advancements have not only widened the scope and applicability of SHM but have also presented novel prospects and complexities for researchers and practitioners in the field (Mostafa and Tawfik, 2016;Nguyen et al, 2021;Ngoc Long Nguyen et al, 2023;Tran-Ngoc et al, 2020a).…”

Section: Introductionmentioning

confidence: 99%

An effective Approach for Damage Detection using Reduction Model Technique and Optimization Algorithms

Ngoc,

Bui-Tien,

Tran-Ngoc

2023

Lat. Am. j. solids struct.

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With the development of science and technology in recent decades, numerous optimization algorithms have emerged and been successfully applied in various fields. Particle swarm optimization (PSO) is a wellestablished evolutionary algorithm commonly used for optimization tasks. However, similar to other evolutionary algorithms, PSO has two main limitations that can hinder its performance. The first limitation is premature convergence, which can result in suboptimal solutions. The second limitation is the high computational time since PSO employs all particles in the swarm for each iteration. To overcome these limitations, in this work, we propose coupling a reduction model technique, specificially, Orthogonal Diagonalization (OD) with a hybrid algorithm combining Genetic Algorithm (GA) and PSO, termed HGAPSO-OD. To evaluate the effectiveness of the proposed approach, a large-scale railway bridge, calibrated based on field measurements, is used as a case study. The results demonstrate that HGAPSO-OD not only increases the accuracy but also reduces computational time of GA and traditional PSO.

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“…A literature review demonstrates that crack detection methods based on natural frequency changes are mostly focused on the bending mode vibration (Benedetti et al, 2018; Elshamy et al, 2018; Rubio et al, 2016; Zhang and Yan, 2017). Mostafa and Tawfik (2016) have investigated the accuracy of a crack detection method by considering different combinations of axial and bending frequencies. Because the coupled bending-torsional vibration (CBTV) has wide application in the engineering structures such as aircraft wings, high aspect ratio blades of turbine, helicopter and propeller and also unsymmetrical composite structures, in this article, the CBTV is considered.…”

Section: Introductionmentioning

confidence: 99%

“…Research studies investigating the cracked structures under CBTV can be classified into two categories. Firstly, the research studies that follow a forward problem attempt to relate known damage properties to changes in some system parameters (Mostafa and Tawfik, 2016). In other words, the crack features are known and generally, researchers aim to investigate the effect of crack on the natural frequencies and mode shapes.…”

Section: Introductionmentioning

confidence: 99%

Multi-crack detection in general cross-section swept wings based on natural frequency changes

Barzegar

Mohebpour

Alighanbari

2020

Journal of Vibration and Control

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In this article, a multi-crack detection method, which is based on natural frequency changes and the concept of modal strain energy, is for the first time developed for the general cross-section swept tapered wings under coupled bending-torsional vibration and applied to the solid and thin-walled airfoil cross-section wings. The presented method is able to handle the problems with an unknown number of cracks and predicts the number of existent cracks, their locations and depths by optimization of an appropriate objective function. The stress intensity factors of airfoil-shaped crack surfaces are obtained using an approximation method. Inputs of the detection method are natural frequencies of uncracked and cracked wings which are calculated by using a mathematical model and finite element method software ANSYS, respectively, and validated by comparison with former research studies. In the mathematical model, the Rayleigh–Ritz method is used to calculate the coupled bending-torsional mode shapes of the uncracked wing and their corresponding natural frequencies. Results demonstrate that the proposed method has precisely predicted the number, locations and depths of cracks in all case studies.

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Crack Detection Using Mixed Axial and Bending Natural Frequencies in Metallic Euler-Bernoulli Beam

Cited by 6 publications

References 34 publications

Static and Dynamic Analyses of Spliced Column

Static and Dynamic Analyses of Spliced Column

An effective Approach for Damage Detection using Reduction Model Technique and Optimization Algorithms

Multi-crack detection in general cross-section swept wings based on natural frequency changes

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