Structural Health Monitoring of an Advanced Grid Structure with Embedded Fiber Bragg Grating Sensors

Amano, Masataro; Okabe, Yoji; Takeda, Nobuo; Ozaki, Tsuyoshi

doi:10.1177/1475921707081967

Cited by 25 publications

(14 citation statements)

References 17 publications

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“…On the basis of the calculation results, the anchorage set of the wedge-type anchorage is relatively smaller comparing to the flat anchorage and waveform anchorage. Up to date, there are no recommendations on the anchorage set of wedge-type anchorages in the current specifications [30][31][32]. Thus, according to this calculation, it 8 Journal of Sensors is necessary to recommend using 0.8 mm as an initial anchorage set since a certain degree of safe redundancy is taken into account.…”

Section: Short-term Prestress Lossmentioning

confidence: 99%

An Experimental Investigation on Flexural Behavior of Reinforced Concrete Beams Strengthened by an Intelligent CFRP Plate with Built-In Optical Fiber Bragg Grating Sensors

Zhou

Wang

2018

Journal of Sensors

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The difficulties induced from high-durability package, large-scale measurement, and sensor installation make it a big challenge but an urgent need to predict the mechanical behavior of strengthened reinforced concrete structure with the externally bonded fiber-reinforced polymer (FRP) plate under harsh environments and rough construction process. In an effort to solve this challenge, this paper proposes a novel end anchored self-sensing CFRP plate assembly with built-in optical fiber Bragg grating (FBG) sensor. The self-sensing principle is presented and a demonstration test was carried out in the laboratory in order to investigate the self-sensing properties of the intelligent CFRP plate. Three-point flexural tests of a total of ten RC beams were carried on: six strengthened with the bonded or unbonded posttensioned intelligent CFRP plates, one strengthened with the ordinary CFRP plate, and three strengthened with the control beams. The full-range CFRP plate strain at the maximum moment was measured utilizing the FBG interrogator. Using this monitoring data, the short-term prestress loss attributed to anchorage set and the relationship between the external load and the CFRP strain at the middle span associated with the integral response of the strengthened member were investigated. Besides, the objective of the tests was also to gain a better understanding of the failure mode and the flexural behavior of RC beams strengthened with posttensioned CFRP plates taking into account the different strengthening methods, initial damage, and the dead load before strengthening. The experimental results showed that the developed CFRP plate with built-in FBG sensors not only can be the reinforcement of the RC structures, but also provide an effective way to monitor the full-range behavior of the CFRP plate with the excellent self-sensing property shown in the demonstration tests.

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Section: Short-term Prestress Lossmentioning

confidence: 99%

An Experimental Investigation on Flexural Behavior of Reinforced Concrete Beams Strengthened by an Intelligent CFRP Plate with Built-In Optical Fiber Bragg Grating Sensors

Zhou

Wang

2018

Journal of Sensors

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“…Although a grid structure with embedded FBG sensors has been explored for structural health monitoring on a large scale [1], it has rarely been considered in robotics. The ribs of the grid are thick enough to encapsulate the optical fibers and undergo axial and bending strains as the grid deforms.…”

Section: A Exoskeleton Structurementioning

confidence: 99%

“…The interrogator built for this study uses 16 channels of a parallel optical-processing chip. Each channel is separated by 100 GHz (approximately 0.8 nm wavelength spacing around an operating wavelength of 1550 nm) 1 so that the total required source bandwidth is 12.8 nm. We provide further description of operating principles in Section VIII and describe how this approach can be adapted to support larger numbers of FBG sensors in a single fiber in the Appendix.…”

Section: Force Controllermentioning

confidence: 99%

“…We focus on a particular class of optical sensors, i.e., fiber Bragg grating (FBG) sensors, which are finding increasing applications in structural health monitoring [1], [29], [30], and other specialized applications in biomechanics [10], [13] and robotics [42], [44]. FBG sensors have been attached to or embedded in the metal parts [17], [31] and composites [55] to monitor forces, strains, and temperature changes.…”

Section: Introductionmentioning

confidence: 99%

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Exoskeletal Force-Sensing End-Effectors With Embedded Optical Fiber-Bragg-Grating Sensors

Park¹,

Ryu²,

Black

et al. 2009

IEEE Trans. Robot.

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Abstract-Force sensing is an essential requirement for dexterous robot manipulation. We describe composite robot end-effectors that incorporate optical fibers for accurate force sensing and estimation of contact locations. The design is inspired by the sensors in arthropod exoskeletons that allow them to detect contacts and loads on their limbs. In this paper, we present a fabrication process that allows us to create hollow multimaterial structures with embedded fibers and the results of experiments to characterize the sensors and controlling contact forces in a system involving an industrial robot and a two-fingered dexterous hand. We also briefly describe the optical-interrogation method used to measure multiple sensors along a single fiber at kilohertz rates for closed-loop force control.Index Terms-Biologically inspired robots, dexterous manipulation, fiber Bragg grating (FBG), force and tactile sensing, force control, shape-deposition manufacturing.

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“…Amano et al [21] embedded multiplexed-fiber FBG sensors into an aerospace carbon/epoxy advanced grid structure to measure mechanical strains of all ribs to evaluate damage under low-velocity impact loading. Dvorak et al [22] embedded FBG sensors into the carbon/epoxy spar caps and in the adhesive joints of a glass/epoxy composite wing to monitor strains during a static loads test.…”

Section: Fbg Monitoring Of Large Scale Structuresmentioning

confidence: 99%

Large Scale Applications Using FBG Sensors: Determination of In-Flight Loads and Shape of a Composite Aircraft Wing

Nicolas¹,

Sullivan²,

Richards

2016

Aerospace

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Abstract:Technological advances have enabled the development of a number of optical fiber sensing methods over the last few years. The most prevalent optical technique involves the use of fiber Bragg grating (FBG) sensors. These small, lightweight sensors have many attributes that enable their use for a number of measurement applications. Although much literature is available regarding the use of FBGs for laboratory level testing, few publications in the public domain exist of their use at the operational level. Therefore, this paper gives an overview of the implementation of FBG sensors for large scale structures and applications. For demonstration, a case study is presented in which FBGs were used to determine the deflected wing shape and the out-of-plane loads of a 5.5-m carbon-composite wing of an ultralight aerial vehicle. The in-plane strains from the 780 FBG sensors were used to obtain the out-of-plane loads as well as the wing shape at various load levels. The calculated out-of-plane displacements and loads were within 4.2% of the measured data. This study demonstrates a practical method in which direct measurements are used to obtain critical parameters from the high distribution of FBG sensors. This procedure can be used to obtain information for structural health monitoring applications to quantify healthy vs. unhealthy structures.

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Structural Health Monitoring of an Advanced Grid Structure with Embedded Fiber Bragg Grating Sensors

Cited by 25 publications

References 17 publications

An Experimental Investigation on Flexural Behavior of Reinforced Concrete Beams Strengthened by an Intelligent CFRP Plate with Built-In Optical Fiber Bragg Grating Sensors

An Experimental Investigation on Flexural Behavior of Reinforced Concrete Beams Strengthened by an Intelligent CFRP Plate with Built-In Optical Fiber Bragg Grating Sensors

Exoskeletal Force-Sensing End-Effectors With Embedded Optical Fiber-Bragg-Grating Sensors

Large Scale Applications Using FBG Sensors: Determination of In-Flight Loads and Shape of a Composite Aircraft Wing

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