An elastic-wave-based full-wavefield imaging method for investigating defects in a high-speed railway under-track structure

Che, Ailan; Tang, Zheng; Feng, Shaokong

doi:10.1016/j.soildyn.2015.06.005

Cited by 12 publications

(10 citation statements)

References 16 publications

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“…Taekeun et al in Korea applied three different processing methods for analyzing data acquired from the IE test of a concrete slab with simulated delamination and void defects, namely the classical impact-echo method, the peak frequency map, and the 4D spectrum technique [8]. In addition, several other approaches, including hammer test [9,10], full-wavefield imaging [11], and ground-penetrating radar (GPR) [12][13][14] methods, have been employed by scholars in different countries for the damage detection of the track or concrete slab. Guidelines for track maintenance are commonly seen in both eastern and western areas [15,16].…”

Section: Introductionmentioning

confidence: 99%

Application Study on Fiber Optic Monitoring and Identification of CRTS-II-Slab Ballastless Track Debonding on Viaduct

Guo

Wang

et al. 2021

Applied Sciences

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China Railway Track System (CRTS)-II-slab ballastless track is a new type of track structure, and its interlayer connection state is considerably important for the operation safety and ride comfort of high-speed trains. However, the location and multiple influencing factors of interlayer debonding lead to difficulties in monitoring and identification. Here, the research on the design and application of a monitoring scheme that facilitates interlayer debonding detection of ballastless track and an effective indicator for debonding identification and assessment is proposed. The results show that on-site monitoring can effectively capture the vibration signals caused by train vibration and interlayer debonding. The features of the data acquired in the situations with and without interlayer debonding are compared after instantaneous baseline validation. Some significant features capable of obviously differentiating a debonding state from the normal state are identified. Furthermore, a new indicator, combining multiple debonding-sensitive features by similarity-based weights normalizing the initial difference between mutual instantaneous baselines, is developed to support rational and comprehensive assessment quantitatively. The contribution of this study includes the development and application of an interlay-debonding monitoring scheme, the establishment of an effective-feature pool, and the proposal of the similarity-based indicator, thereby laying a good foundation for debonding identification of ballastless track.

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Section: Introductionmentioning

confidence: 99%

Application Study on Fiber Optic Monitoring and Identification of CRTS-II-Slab Ballastless Track Debonding on Viaduct

Guo

Wang

et al. 2021

Applied Sciences

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“…The impact of train induced vibrations on adjacent structures and attenuation of ground vibration was studied by many researchers (e.g., [23][24][25][26][27][28]). In these studies, only one track or symmetry along the track (only one single rail) is considered to predict the track and ground vibrations due to moving loads.…”

Section: Introductionmentioning

confidence: 99%

Effect of Track Irregularities on the Response of Two-Way Railway Tracks

Javaid

Choi

2019

Applied Sciences

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In predicting the response of track from a moving train only one track is generally considered. However, the effect of ground vibrations from one track and its effect on the nearby tracks has not been studied completely. Therefore, in the present paper, the effect of track irregularities and speed on the prediction of two-way tracks response is investigated. For this purpose, a three-dimensional dynamic finite element (FE) model capable of simulating interactions between the train and track by using a nonlinear hertz contact method was developed. The model uses tensionless stiffness between the wheel and rail to couple them. The model components including the sleeper, ballast, and soil domain are represented by solid brick elements. The rails are modeled as 3D Euler–Bernoulli beam elements. An iterative numerical algorithm was established for the integrations of the train and track interface. A comparative analysis was performed at various speeds and rail surface irregularity wavelengths. With the increase in speed, the results showed a significant increase in the adjacent tracks response and can induce much larger track vibrations at high frequency.

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“…Non-contact-based measurement approaches use high technology instruments in order to overcome the drawbacks of the conventional deformation sensors. Laser Doppler Vibrometer (LDV) [ 5 , 6 ], Global Positioning System (GPS) [ 7 , 8 , 9 , 10 , 11 , 12 ], laser scanning [ 13 , 14 , 15 ], and image-based measurement methods [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ] are among the most popular non-contact devices. However, all of these methods suffer from drawbacks that limit their application for deformation measurement of bridges.…”

Section: Introductionmentioning

confidence: 99%

Developing an Optical Image-Based Method for Bridge Deformation Measurement Considering Camera Motion

Abolhasannejad

Huang

Namazi

2018

Sensors

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Since deformation estimation may lead to errors occurring when the camera vibrates, it is necessary to remove the image global motion before computing real bridge deformation. In this study, a combination of image motion correction algorithm and 2D image-based deformation measurement technique was utilized to address the issue of camera motion during the image data acquisition for bridge deformation measurement. Based on the proposed methodology, the image motion parameters were estimated by defining an effective sub-image in the image and using Iterative Affine Motion Estimator. Then the estimated parameters were applied to all pixels of each captured image to remove the motion effect. Finally, the corrected images were used to analyze by a 2D image-based deformation measurement technique in order to extract and measure real bridge deformation by tracking artificial or natural targets. The proposed methodology was validated by two experiments in the lab and field environments. Achieved results show the accuracy and reliability of the proposed methodology.

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An elastic-wave-based full-wavefield imaging method for investigating defects in a high-speed railway under-track structure

Cited by 12 publications

References 16 publications

Application Study on Fiber Optic Monitoring and Identification of CRTS-II-Slab Ballastless Track Debonding on Viaduct

Application Study on Fiber Optic Monitoring and Identification of CRTS-II-Slab Ballastless Track Debonding on Viaduct

Effect of Track Irregularities on the Response of Two-Way Railway Tracks

Developing an Optical Image-Based Method for Bridge Deformation Measurement Considering Camera Motion

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