Non-contact monitoring for assessing potential bridge damages

Kovačić, Boštjan; Muršec, Luka; Toplak, Sebastian; Lubej, Samo

doi:10.1051/e3sconf/202016403001

Cited by 3 publications

(3 citation statements)

References 14 publications

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“…Therefore, it is necessary to monitor the health of bridges, especially the displacement generated by the bridge under load [1]. In addition to strain gauge [2], optical fiber sensor, and accelerometer [3], there are also precise level, robotic total station (RTS) [4][5][6][7][8][9], LiDAR DTMs [10,11], and global navigation satellite system (GNSS) instrument [12][13][14], etc. Strain gauge and optical fiber sensors have limitations in displacement measurement [1], and the calculation of accelerometer by double integration will lead to serious errors [15,16].…”

Section: Introductionmentioning

confidence: 99%

Displacement Monitoring of a Bridge Based on BDS Measurement by CEEMDAN–Adaptive Threshold Wavelet Method

Yang

Xiang

et al. 2023

Sensors

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From the viewpoint of BDS bridge displacement monitoring, which is easily affected by background noise and the calculation of a fixed threshold value in the wavelet filtering algorithm, which is often related to the data length. In this paper, a data processing method of Complete Ensemble Empirical Mode Decomposition with Adaptive Noise (CEEMDAN), combined with adaptive threshold wavelet de-noising is proposed. The adaptive threshold wavelet filtering method composed of the mean and variance of wavelet coefficients of each layer is used to de-noise the BDS displacement monitoring data. CEEMDAN was used to decompose the displacement response data of the bridge to obtain the intrinsic mode function (IMF). Correlation coefficients were used to distinguish the noisy component from the effective component, and the adaptive threshold wavelet de-noising occurred on the noisy component. Finally, all IMF were restructured. The simulation experiment and the BDS displacement monitoring data of Nanmao Bridge were verified. The results demonstrated that the proposed method could effectively suppress random noise and multipath noise, and effectively obtain the real response of bridge displacement.

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Section: Introductionmentioning

confidence: 99%

Displacement Monitoring of a Bridge Based on BDS Measurement by CEEMDAN–Adaptive Threshold Wavelet Method

Yang

Xiang

et al. 2023

Sensors

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“…The basic element of geodesy is the acquisition of spatial data of the earth's surface and objects with the help of various geodetic measurement techniques and instruments. The applicability of non-contact methods for determining displacements and deformations is described in [1][2][3][4][5]. In addition, the analysis of various geodetic methods is carried out to determine displacements and their applicability and suitability for detecting displacements of smaller values.…”

Section: Introductionmentioning

confidence: 99%

Applicability and Analysis of the Results of Non-Contact Methods in Determining the Vertical Displacements of Timber Beams

et al. 2021

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Determining the displacements and consequent deformations of structures is a demanding branch of engineering. Displacements are most often determined by geodetic methods, among which high-precision non-contact methods have recently taken the lead. Engineering geodesy is an indispensable part of construction projects. In the desire for efficient and fast measurements, the technology of terrestrial laser scanning (TLS) and the use of robotic total station (RTS) and other geodetic methods are becoming more and more useful for engineers. In the presented study, we focused on the measurement and comparison of vertical displacements with various mentioned equipment and the determination of the influence of meteorological conditions on the displacements of timber beams that we used to perform the experiment. Measurements were performed both in the laboratory and outdoors. A novelty in the work was the use of a TLS scanner to determine the evaluation of small value displacements and the analysis of the usability of geodetic measuring equipment. In the Materials and Methods section, we describe the equipment used and the characteristics of the beams. The Results section describes the experimental outcomes, which include the performance of experimental analysis of vertical displacements of timber beams under different meteorological conditions. Altogether, the results consist of geodetic measurements and the processing of measured data. The results of measurements of vertical displacements with a terrestrial laser scanner were compared with the results obtained with a robotic total station were evaluated and compared with the displacements calculated from static analysis and the results of other methods used.

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“…So in his works A.A. Kuzin and others [1], as well as Tsvetkov V. Y., & Oznamets V. V [2] used satellite and laser equipment in solving classical geodetic problems. Thanks to modern scanning systems, robotic tacheometers, the surveyor in a short period of time is able to obtain a huge array of data about the object without direct contact with the object [3]. The presence of a large amount of source data provides the ability to calculate the desired parameters repeatedly, which increases the reliability of the obtained parameters.…”

Section: Introductionmentioning

confidence: 99%

Applying Newton’s second order optimization method to define transition keys between planar coordinate systems

2020

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The article considers the theoretical component of Newton’s second-order method, its main advantages and disadvantages when used in geodesy. The algorithm for determining the minimum of target functions by the Newton method of the second order was studied and analyzed in detail. Parameters of connection between flat rectangular coordinate systems are calculated. The task of determining the transition keys is relevant for geodesy. Comparative analysis of Newton’s method with the method of conjugated gradients was carried out. The algorithm for solving this problem was implemented in the Visual Basic for Applications software environment. The obtained data allow us to conclude that the Newton method can be used more widely in geodesy, especially in solving nonlinear optimization problems. However, the successful implementation of the method in geodetic production is possible only if the computational process is automated, by writing software modules in various programming languages to solve a specific problem.

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Non-contact monitoring for assessing potential bridge damages

Cited by 3 publications

References 14 publications

Displacement Monitoring of a Bridge Based on BDS Measurement by CEEMDAN–Adaptive Threshold Wavelet Method

Displacement Monitoring of a Bridge Based on BDS Measurement by CEEMDAN–Adaptive Threshold Wavelet Method

Applicability and Analysis of the Results of Non-Contact Methods in Determining the Vertical Displacements of Timber Beams

Applying Newton’s second order optimization method to define transition keys between planar coordinate systems

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