FBG sensors for seismic control and detection in extradosed bridges

Saad, Said

doi:10.21307/ijssis-2021-013

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…They are analyzing their fiber-optic grating seismometers and improving their accuracy and fabrication methods [ 20 , 21 ]. The FBG measurement system is used in various applications, such as seismic activity monitoring in coal mines [ 22 ], or health structure monitoring [ 23 ]. The most scientifically active areas of FBG sensors are evaluation methods and their encapsulation [ 24 , 25 ].…”

Section: State Of the Artmentioning

confidence: 99%

Comparative In Situ Study of Dynamic Load Generated by Gravel Piles Measured by a Fiber-Optic Interferometer

Stolárik

Kepák

Pinka

et al. 2022

Sensors

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Currently, all the technology used for seismic monitoring is based on sensors in the electrical domain. There are, however, other physical principles that may enable and fully replace existing devices in the future. This paper introduces one of these approaches, namely the field of fiber optics, which has great potential to be fully applied in the field of vibration measurement. The proposed solution uses a Michelson fiber-optic interferometer designed without polarization fading and with an operationally passive demodulation technique using three mutually phase-shifted optical outputs. Standard instrumentation commonly used in the field of seismic monitoring in geotechnical engineering was used as a reference. Comparative measurements were carried out during the implementation of gravel piles, which represents a significant source of vibration. For the correlation of the data obtained, the linear dependence previously verified in laboratory measurements was used. The presented results show that the correlation is also highly favorable (correlation coefficient in excess of 0.9) from the values measured in situ, with an average deviation for the oscillation velocity amplitude of the optical sensor not exceeding 0.0052.

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Section: State Of the Artmentioning

confidence: 99%

Comparative In Situ Study of Dynamic Load Generated by Gravel Piles Measured by a Fiber-Optic Interferometer

Stolárik

Kepák

Pinka

et al. 2022

Sensors

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“…An intelligent mobile robot system to guide passengers was presented in Tran et al's study [12], where the distance between the robot and passengers is predicted with the use of Multi-task Cascaded Convolutional Networks (MTCNN). Also, a real-time monitoring deviation against seismic effects and a robust fiber Bragg grating (FBG) sensor network are presented in Saad's study [13].…”

Section: Introductionmentioning

confidence: 99%

Barrier Function-Based Integral Sliding Mode Controller Design for a Single-Link Rotary Flexible Joint Robot

Mohammad,

AL-Samarraie,

Jaber

2024

International Journal on Smart Sensing and Intelligent Systems

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This paper proposes and evaluates a novel control approach for trajectory tracking, stability enhancement, and vibration reduction of a flexible joint robot (FJR). The FJR is a 2-degree-of-freedom underactuated nonlinear system that is challenging to control due to vibration, underactuation, uncertainties, and external disturbances. The control objectives are high trajectory tracking performance together with suppressing vibration. The proposed control approach uses integral sliding mode control (ISMC) combined with a barrier function based on back-stepping. This ensures robust and smooth performance by eliminating the reaching phase where sliding mode control (SMC) is typically not robust. Robustness is thus guaranteed from the start. The FJR is modeled as a 4th-order system using Lagrangian mechanics and decomposed into two 2nd-order subsystems for control design. Sliding variables are defined for each subsystem. Using these variables, the proposed control achieves robust trajectory tracking, stability, and vibration reduction. Numerical simulations in MATLAB validate the superior performance of the proposed ISMC-barrier function control compared to conventional ISMC for the FJR. This novel control approach addresses the challenges of controlling this FJR.

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“…The FBG technology is proved to be effective in temperature and strain sensors [1] for several fields, such as civil engineering [2][3][4], health [5], aeronautics, and artificial intelligence in robotics [6]. The FBG technology has many advantages like fast response, high sensitivity and electromagnetic interference opposition [7].…”

Section: Introductionmentioning

confidence: 99%

A New Interrogation System for FBG Sensors based on Midband Filter with Correction

Ghedira,

Saad

2023

Eng. Technol. Appl. Sci. Res.

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In this paper, a midband interrogation system for Fiber Bragg Grating (FBG) sensors is presented and its numerical demonstration is reported. The midband interrogation system is based on a finite reflection filter with automatic correction. The filter is used to interrogate the FBG sensors. The strain FBG sensors were used to demonstrate the effectiveness of the proposed systems. The results demonstrate that the proposed system of interrogation has a great resolution (±1 pm) with good stability.

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FBG sensors for seismic control and detection in extradosed bridges

Cited by 3 publications

References 15 publications

Comparative In Situ Study of Dynamic Load Generated by Gravel Piles Measured by a Fiber-Optic Interferometer

Comparative In Situ Study of Dynamic Load Generated by Gravel Piles Measured by a Fiber-Optic Interferometer

Barrier Function-Based Integral Sliding Mode Controller Design for a Single-Link Rotary Flexible Joint Robot

A New Interrogation System for FBG Sensors based on Midband Filter with Correction

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