Vibration-based cable condition assessment: A novel application of neural networks

Zarbaf, Seyed Ehsan Haji Agha Mohammad; Norouzi, Mehdi; Allemang, Randall J.; Hunt, Victor J.; Helmicki, Arthur J.; Venkatesh, Chandrasekar

doi:10.1016/j.engstruct.2018.09.060

Cited by 43 publications

(9 citation statements)

References 37 publications

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“…In addition to the abovementioned studies, various studies based on modal data have investigated cable estimation techniques. For example, studies have employed methods using mode shapes, methods dealing with complicated boundary conditions (Chen et al, 2016;Chen et al, 2018;Yan et al, 2019), methods dealing with inclined cables (Kim and Park, 2007;Ma, 2017), methods using genetic algorithm and particle swarm optimization (Zarbaf et al, 2017) and methods using neural networks (Zarbaf et al, 2018). Studies are also conducted to relate tension to the natural frequencies of tensegrity structures using a finite element formulation (Ashwear and Eriksson, 2014;Ashwear and Eriksson, 2017).…”

Section: Introductionmentioning

confidence: 99%

Tension Estimation Method for Cable With Damper Using Natural Frequencies

Furukawa

Hirose

Kobayashi

2021

Front. Built Environ.

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In the maintenance of cable structures, such as cable-stayed bridges and extra-dosed bridges, it is necessary to estimate the tension acting on the cables. The safety of a cable is confirmed by checking whether the tension acting on the cable is within the allowable value. In current Japanese practice, the tension of a cable is estimated using the vibration method or the higher-order vibration method, which considers the natural frequencies of the cable. However, in recent years, the aerodynamic vibration of cables caused by wind has become a problem owing to the recent increase in the cable length and low damping performance of the cable itself. To suppress the aerodynamic vibration of cables, dampers are installed onto the cables. Because the damper changes the cable’s natural frequencies, the vibration method and higher-order vibration method are inappropriate for measuring the tension of a cable with a damper. In this paper, a new tension estimation method for a cable with a damper is proposed. To model a cable with a tensioned Bernoulli-Euler beam, theoretical equations for estimating the natural frequencies were derived. The proposed method inversely estimates the tension and bending stiffness of the cable and damper parameters, simultaneously, from the natural frequencies. The validity of the proposed method was confirmed by conducting numerical simulations and experiments. In the numerical verification, the performance of the proposed method was investigated using 80 numerical models. In the experimental verification, the estimation accuracy of the proposed method was investigated by considering 16 test cases. Thus, it was confirmed that the tension estimation accuracy was high, whereas the bending stiffness and damper parameter estimation accuracy was unsatisfactory. The tension estimation error was within 10% in all experimental cases, and within 5% if two test cases are excluded. The results obtained by the numerical and experimental verifications confirmed the effectiveness of the proposed method in tension estimation.

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Section: Introductionmentioning

confidence: 99%

Tension Estimation Method for Cable With Damper Using Natural Frequencies

Furukawa

Hirose

Kobayashi

2021

Front. Built Environ.

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“…Various studies have investigated cable tension estimation methods, which include methods dealing with complicated boundary conditions (Chen et al, 2016(Chen et al, , 2018Yan et al, 2019), a method dealing with the uncertain boundary condition of a short cable by introducing an additional mass block (Li et al, 2021), methods dealing with inclined cables (Kim and Park, 2007;Ma, 2017), a method dealing with a cable with flexible supports (Foti et al, 2020), a method dealing with environmental temperature variation (Ma et al, 2021), methods for two cables connected by an intersection clamp (Furukawa et al, 2022a), a method using the power spectrum and cepstrum (Feng et al, 2010), a method using a finite element analysis (Gan et al, 2019), a method using a genetic algorithm and particle swarm optimization (Zarbaf et al, 2017), and a method using neural networks (Zarbaf et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Tension Estimation Method for Cable With Damper Using Natural Frequencies and Two-Point Mode Shapes With Uncertain Modal Order

Furukawa

Suzuki²,

Kobayashi³

2022

Front. Built Environ.

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In the maintenance of cable structures, such as cable-stayed bridges, cable safety is assessed based on the cable tension. In Japan, the cable tension is generally estimated from the cable’s natural frequencies using the higher-order vibration method. In recent years, dampers have been installed onto cables to suppress aerodynamic vibrations. Because the damper changes the cable’s natural frequencies, the damper is removed to measure the natural frequencies and estimate the cable tension without a damper, and the damper is then reinstalled. To avoid damper removal and reinstallation, the authors previously proposed Method 2F for estimating the tension of a cable with a damper from the natural frequencies without removing the damper. Because the tension estimation error of the higher-order vibration method for a cable without a damper has been reported as 5%, the authors set the target tension estimation error within 5%. However, the tension estimation error of Method 2F exceeded 5% in the experimental verification. Furthermore, although Method 2F estimates the tension and bending stiffness of the cable and the damper parameters simultaneously from the natural frequencies, the accuracy of the bending stiffness and damper parameters is unsatisfactory. In this paper, the new Method 2FM is proposed to estimate the tension and bending stiffness of the cable and damper parameters using the natural frequencies and two-point mode shapes. With the addition of mode shapes, Method 2FM attempts to improve the accuracy of estimating the tension and other parameters. The validity of Method 2FM was confirmed by numerical simulations and experiments. The numerical verification confirmed that Method 2FM is superior to Method 2F in estimating the cable tension and damper parameters. The experimental verification confirmed that the tension estimation accuracy of Method 2FM is higher than that of Method 2F, and the estimation error is lower than 5%. However, the damper parameters estimated by Method 2FM are different to the design values. The reason for this is the modeling error of the damper, as found by conducting an element test on the damper.

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“…Therefore, an analysis method capable of efficiently measuring the responses of cables is required for the constant monitoring of remote cables . Moreover, along with studies on cable tension measurement and estimation accuracy improvement, many studies have also been conducted to make the cable tension estimation process more efficient and convenient . The method of using vision‐based systems is noncontact and economical, thus being suitable for cable tension estimation using indirect methods with limited accessibility.…”

Section: Introductionmentioning

confidence: 99%

“…[23][24][25][26][27] Moreover, along with studies on cable tension measurement and estimation accuracy improvement, many studies have also been conducted to make the cable tension estimation process more efficient and convenient. 5,[28][29][30][31] The method of using vision-based systems is noncontact and economical, thus being suitable for cable tension estimation using indirect methods with limited accessibility.…”

mentioning

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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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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Vibration-based cable condition assessment: A novel application of neural networks

Cited by 43 publications

References 37 publications

Tension Estimation Method for Cable With Damper Using Natural Frequencies

Tension Estimation Method for Cable With Damper Using Natural Frequencies

Tension Estimation Method for Cable With Damper Using Natural Frequencies and Two-Point Mode Shapes With Uncertain Modal Order

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

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