Guided Wave Propagation for Monitoring the Rail Base

Yue, Guodong; Cui, Xiushi; Zhang, Ke; Wang, Zhan; An, Duo

doi:10.1155/2020/4756574

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…In order to prove that the numerical model was correct, the time of arrival (ToA) measured from the A-scan of the simulation was compared with the analytically calculated ToA obtained using the velocities from dispersion curves. In order to determine the ToA from simulation results, the peak-to-peak method [ 44 ] was used, where the Hilbert envelope allowed determining the propagation time of the group of waves with the highest energy. For the analytical calculation, the distance between the transducer and the surface of the GFRP plate was 10 mm for both the transmitter and the receiver, and the speed of sound in air was taken as 343.21 m/s.…”

Section: Resultsmentioning

confidence: 99%

Comparison of Ultrasonic Non-Contact Air-Coupled Techniques for Characterization of Impact-Type Defects in Pultruded GFRP Composites

et al. 2021

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This article compares different air-coupled ultrasonic testing methods to characterize impact-type defects in a pultruded quasi-isotropic glass fiber-reinforced plastic (GFRP) composite plate. Using the air-coupled transducers, comparisons among three methods were performed, namely, bulk-wave through transmission, single-side access using guided waves, and ultrasonic-guided wave tomography. The air coupled through transmission technique can determine the size and shape of impact-type defects with a higher resolution, but with the consequence of time consumption and, more importantly, the necessity of access to both sides of the sample. The guided wave technique on the other hand, allows a single-side inspection and is relatively fast. It can be used to determine the size of the defect using ultrasonic B-scan, but the exact shape of the defect will be compromised. Thus, in this article, to determine the shape of the defect, application of the parallel beam tomographic reconstruction technique using guided Lamb waves is demonstrated. Furthermore, a numerical finite element simulation was performed to study the effects of guided wave propagation in the composite sample and interaction with the internal defect. Lastly, the results from the experiments of different techniques were compared according to possibilities of defect sizing and determination of its shape.

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Section: Resultsmentioning

confidence: 99%

Comparison of Ultrasonic Non-Contact Air-Coupled Techniques for Characterization of Impact-Type Defects in Pultruded GFRP Composites

et al. 2021

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“…According to acoustoelastic principles, the maximum size of an element should not exceed one-tenth of the wavelength under investigation [37,38]. To determine the maximum mesh size, the wavelengths of the S 0 and A 0 modes were calculated using equation (13) [39], which relates wavelength (λ wave ) to group velocity and excitation frequency (f).…”

Section: Finite Element Modelingmentioning

confidence: 99%

Thermal stress estimation of a constrained metallic plate using symmetric and antisymmetric Lamb wave group velocities

Azad,

Kang,

Lee

et al. 2024

Smart Mater. Struct.

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This paper presents a novel technique for estimating thermal-induced stress in constrained metallic plates using the group velocity of Lamb waves, the accuracy of which is crucial for assessing the structural integrity and serviceability of metallic structures. However, without the ability to gauge the current stress levels, obtaining such measurements is technically challenging. To overcome this, we propose a thermal stress estimation technique that uses changes in the group velocities of the fundamental symmetric (S0) and antisymmetric (A0) Lamb wave modes caused by thermal and stress variations. First, this study introduces a theoretical-based zero-crossing algorithm to measure the group velocities of S0 and A0 Lamb wave modes. Next, leveraging the acoustoelastic coefficients corresponding to the S0 and A0 modes, which are determined before the plate’s installation, this study generates the lines depicting the changes in group velocity induced by temperature variations (CT) for both the S0 and A0 modes. These CT lines are derived from the lines illustrating changes in group velocity due to thermal stress variations (CTS), which are obtained after plate installation. Ultimately, the generated CT lines can be used to estimate thermal stress throughout the entirety of the plate’s operational life span by isolating the distinct stress variation effects from the CTS lines. The numerical validation results show favorable accuracy in thermal stress estimation in a constrained plate subjected to temperature variation using both S0 and A0 Lamb wave modes, with average errors of 0.63% and 0.91%, respectively.

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“…Mulder [1][2][3][4], G.V. Evans [5], M. Braubach [6], and Yu Zhang et al [7], have contributed interesting perspectives and solutions regarding the relationship between the housing sector and demographic behavior, with topics ranging from health care to migration and family household development. In Russia and Kyrgyzstan, scientific opinions indicate that the development of the housing sector is significantly influenced by demographic trends [8][9][10][11][12], and studies have been conducted on the development of housing construction according to demographic indicators [13,14].…”

Section: Literature Reviewmentioning

confidence: 99%

Analyzing the future of housing provision in a high-demographic growth region

Assylbayev,

Niiazalieva,

Bekjanov

et al. 2023

E3S Web Conf.

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This scientific article aims to determine the level of security of Kyrgyzstan citizens with regard to housing until 2030. The study takes into account the historical period from 1990 to present, analyzing the development of the housing stock and demographic population. The objective of this research is to solve the problem of housing provision for the population of the republic through effective management of the state’s housing and demographic strategy. The study focuses on the interdependence of population growth factors and the dynamics of the housing stock in the village-city context, using a general scientific methodology for analysis. The article presents a correlation analysis and a predictive review of demographic and housing aspects, accounting for the interdependent dynamics of population and housing. The main results include a mutual influence analysis between demographic and housing dynamics, as well as a comparative forecast of demographic and housing parameters until 2030. The study provides recommendations for the Republican housing program “My Home” for 2021-2026. This research is important for the practical applicability and relevance of regional policy on housing and demographic issues.

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Guided Wave Propagation for Monitoring the Rail Base

Cited by 9 publications

References 18 publications

Comparison of Ultrasonic Non-Contact Air-Coupled Techniques for Characterization of Impact-Type Defects in Pultruded GFRP Composites

Comparison of Ultrasonic Non-Contact Air-Coupled Techniques for Characterization of Impact-Type Defects in Pultruded GFRP Composites

Thermal stress estimation of a constrained metallic plate using symmetric and antisymmetric Lamb wave group velocities

Analyzing the future of housing provision in a high-demographic growth region

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