Local positioning accuracy of laser sensors for structural health monitoring

Casciati, Fabio; Wu, Lijun

doi:10.1002/stc.1488

Cited by 30 publications

(21 citation statements)

References 7 publications

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“…Figure 15 shows the typical finite element model created using ABAQUS. Table 3 shows the tension values estimated using the image-based back analysis method when second, second to third, … , and second to the measured modal frequency were applied to the correction factor β i of Equation (15). The estimated tension values had errors within ±2% from the tension values calculated using the vibration method, thereby confirming the validity of the analysis.…”

Section: Application Of the Image-based Back Analysis Methodsmentioning

confidence: 58%

“…For cable‐supported bridges, the efficiency and convenience of tension measurement significantly depend on the kinds of sensors used. The kinds of sensors used to measure the cable tension can be generally and largely divided into contact‐type sensors (e.g., load cells, hydraulic jacks, accelerometers, and elastomagnetic sensors) and noncontact‐type sensors (e.g., laser vibrometers and vision‐based systems). They can also be divided into the wired and wireless types depending on the presence or absence of electric or data wires .…”

Section: Introductionmentioning

confidence: 99%

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Image‐based back analysis for tension estimation of suspension bridge hanger cables

Kim

Cheung

Park³

et al. 2020

Struct Control Health Monit

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Summary In suspension bridges, hanger cables are the main load‐supporting members. The tension of the hanger cables of a suspension bridge is a very important parameter for assessing the integrity and safety of the bridge. In general, indirect methods are used to measure the tension of the hanger cables of a suspension bridge in use. A representative indirect method is the vibration method, which extracts modal frequencies from the cables' responses and then measures the cable tension using the cables' geometric conditions and the modal frequencies. In this study, ambient vibration tests were conducted on a suspension bridge in use to verify the validity of the image‐based back analysis method, which can estimate the tension of remote hanger cables using the modal frequencies as a parameter. The tension estimated through back analysis, which was conducted to minimize the difference between the modal frequencies calculated using finite element analysis of the hanger cables and the measured modal frequencies, was compared with that measured using the vibration method. It was confirmed that reliable tension estimation is possible even with low‐order modal frequencies when the image‐based back analysis method is used.

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Section: Application Of the Image-based Back Analysis Methodsmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Image‐based back analysis for tension estimation of suspension bridge hanger cables

Kim

Cheung

Park³

et al. 2020

Struct Control Health Monit

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“…Three fundamental tasks of the SHM techniques are detection, localization, and characterization of damage. There are many methods for SHM including acoustic emissions, vibration, laser scanning, digital imaging, electrical impedance, ultrasonic waves, thermal imaging, impact echo, and eddy current . For the purpose of damage detection, a large number of damage indices (DI) has been developed, which make it possible to determine the existence of damage and monitor its further propagation in time.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical research on damage localization in plate-like concrete structures using hybrid approach

Stojić

Nestorović

Marković

et al. 2018

Struct Control Health Monit

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This paper presents an experimental–numerical analysis of damage localization of concrete plate‐like elements on the basis of hybrid approach. The proposed hybrid approach uses the fast discrete wavelet transform, energy approach, and time of flight criterion for the purpose of localization of single and multidamage problems inside or on the periphery of concrete elements. Verification of the proposed damage localization approach has been performed under laboratory conditions using a laser scanning‐based system with piezoelectric excitation of the wave propagation. Numerical simulation of the wave propagation is performed using the explicit finite element method using 3D models with linear‐elastic material model of concrete with Rayleigh damping. The Rayleigh damping coefficients are determined on the basis of experimental data and implemented in numerical models. Validation of the numerical model is conducted, based on the comparison with sensor output signals obtained through experimental measuring and a very good agreement of results is obtained. The proposed hybrid approach to damage localization is verified using 15 different models/specimens, varying the number, shape (circular or notched), and position of damage, as well as the number and placement of actuators/sensors. For all the analyzed scenarios, the hybrid approach successfully localized the damage even for the least number of used sensor positions. In the models with the circular damage, the damage image created on the basis of the hybrid approach is almost identical to the actual shape of the damage, indicating a good potential of the method for damage localization.

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“…1 The understanding of the structural response of bridges to static or dynamic e®ects has become one of the most important requirements for validating their design, evaluating their performance as well as facilitating their maintenance. 2 To achieve these intentions, some requirements are needed for the development of e®ective measurement tools and techniques in order to accurately determine the natural frequencies, damping characteristics and mode shapes of the bridge. For many years, monitoring the displacement response of bridge structures has relied on measurements made by instruments such as accelerometers, tiltmeters or vision systems, installed on the structure of interest.…”

Section: Introductionmentioning

confidence: 99%

Detection of Shifts in GPS Measurements for a Long-Span Bridge Using CUSUM Chart

Song

et al. 2016

Int. J. Str. Stab. Dyn.

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Timely and correctly evaluating the quality of Global Positioning System (GPS) data is essential for reduction in the number of false alarms and missed detection of a GPS-based bridge deformation monitoring system. This paper investigates how to use the statistical process control technique, known as the cumulative sum (CUSUM) chart, for the detection of small but persistent shifts in the high-rate GPS carrier-phase measurements. First, a mathematical model for the shift detection based on the continuous hypothesis testing is established. The main features and implementation procedure of the CUSUM chart for the shift detection are then summarized, and the corresponding parameter selection method is discussed in detail. To meet the normality requirement of the CUSUM chart, a novel method that transfers the data to the Q-statistic by the estimated cumulative distribution functions is proposed according to the probability integral transform theory. This is followed by a simulation carried out to evaluate the detection performance of the CUSUM chart and exploit its advantages to the commonly used Shewhart chart for the high-rate GPS monitoring data with di®erent shift sizes. Experimental results have showed that the CUSUM chart is sensitive to small persistent shifts compared to the Shewhart chart although it has a delay problem. The integration of CUSUM chart and Shewhart chart would be a reliable approach for the shift detection. Finally, an on-site dynamic monitoring experiment is carried out on a long-span bridge to validate the proposed approach's e®ectiveness in detecting an actual deformation shift, and the experimental results proved to be very encouraging.

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Local positioning accuracy of laser sensors for structural health monitoring

Cited by 30 publications

References 7 publications

Image‐based back analysis for tension estimation of suspension bridge hanger cables

Image‐based back analysis for tension estimation of suspension bridge hanger cables

Experimental and numerical research on damage localization in plate-like concrete structures using hybrid approach

Detection of Shifts in GPS Measurements for a Long-Span Bridge Using CUSUM Chart

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