The Experts below are selected from a list of 4440 Experts worldwide ranked by ideXlab platform
Xiaoyi Dong - One of the best experts on this subject based on the ideXlab platform.
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Simultaneous measurement of stress and temperature with a fiber Bragg grating based on a loop thin-wall Section Beam.
Applied Optics, 2006Co-Authors: Qida Zhao, Guiling Huang, Xiaoyi DongAbstract:We designed and demonstrated what we believe to be a novel sensor for simultaneous measurement of stress and temperature. A fiber Bragg grating is flatly adhered to the surface of a loop thin-wall Section Beam. The theoretical analyses and the experimental results show that both the central wavelength shift and the chirped bandwidth of the grating reflection spectrum have a linear relationship with the stress and the temperature, respectively, and the slopes of them are different. Therefore, the temperature and stress can be discriminated by interrogating the chirped fiber grating. Moreover, we also investigated the strain of the loop thin-wall Section Beam, and the results show that the strain is cosine proportional to the double positional angle.
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Force sensing with temperature self-compensated based on a loop thin-wall Section Beam
IEEE Photonics Technology Letters, 2006Co-Authors: Qida Zhao, Guiling Huang, Xiaoyi DongAbstract:A novel method about force sensing with temperature self-compensated based on a loop thin-wall Section Beam is proposed and demonstrated. Two identical fiber Bragg gratings are rigidly affixed on the outer surface of the Beam with the positional angle difference between the two gratings of 90/spl deg/. The wavelength space between the two reflected peaks of the gratings is proportional to the force and insensitive to temperature when the direction of the force and one of the two gratings are located along a diameter; therefore, the force sensing with temperature self-compensated can be achieved.
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A novel method for independent tuning of the center wavelength and the bandwidth of fiber Bragg grating
Journal of Lightwave Technology, 2006Co-Authors: Qida Zhao, Guiling Huang, Xiaoyi DongAbstract:A novel method for independent tuning of the center wavelength and the bandwidth of a fiber Bragg grating (FBG) was proposed and demonstrated. An FBG was adhered to the outer surface of a loop thin-wall Section Beam. The center wavelength and the bandwidth of the FBG can be tuned independently through changing the force while the fiber grating locates at different special positions. Quasi-chirp-free wavelength tuning with 6.706 nm and bandwidth tuning with 5.368 nm under quasi-shift-free center wavelength were obtained experimentally. The experimental results are in good agreement with the theoretical analyses.
Qida Zhao - One of the best experts on this subject based on the ideXlab platform.
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Simultaneous measurement of stress and temperature with a fiber Bragg grating based on a loop thin-wall Section Beam.
Applied Optics, 2006Co-Authors: Qida Zhao, Guiling Huang, Xiaoyi DongAbstract:We designed and demonstrated what we believe to be a novel sensor for simultaneous measurement of stress and temperature. A fiber Bragg grating is flatly adhered to the surface of a loop thin-wall Section Beam. The theoretical analyses and the experimental results show that both the central wavelength shift and the chirped bandwidth of the grating reflection spectrum have a linear relationship with the stress and the temperature, respectively, and the slopes of them are different. Therefore, the temperature and stress can be discriminated by interrogating the chirped fiber grating. Moreover, we also investigated the strain of the loop thin-wall Section Beam, and the results show that the strain is cosine proportional to the double positional angle.
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Force sensing with temperature self-compensated based on a loop thin-wall Section Beam
IEEE Photonics Technology Letters, 2006Co-Authors: Qida Zhao, Guiling Huang, Xiaoyi DongAbstract:A novel method about force sensing with temperature self-compensated based on a loop thin-wall Section Beam is proposed and demonstrated. Two identical fiber Bragg gratings are rigidly affixed on the outer surface of the Beam with the positional angle difference between the two gratings of 90/spl deg/. The wavelength space between the two reflected peaks of the gratings is proportional to the force and insensitive to temperature when the direction of the force and one of the two gratings are located along a diameter; therefore, the force sensing with temperature self-compensated can be achieved.
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A novel method for independent tuning of the center wavelength and the bandwidth of fiber Bragg grating
Journal of Lightwave Technology, 2006Co-Authors: Qida Zhao, Guiling Huang, Xiaoyi DongAbstract:A novel method for independent tuning of the center wavelength and the bandwidth of a fiber Bragg grating (FBG) was proposed and demonstrated. An FBG was adhered to the outer surface of a loop thin-wall Section Beam. The center wavelength and the bandwidth of the FBG can be tuned independently through changing the force while the fiber grating locates at different special positions. Quasi-chirp-free wavelength tuning with 6.706 nm and bandwidth tuning with 5.368 nm under quasi-shift-free center wavelength were obtained experimentally. The experimental results are in good agreement with the theoretical analyses.
Guiling Huang - One of the best experts on this subject based on the ideXlab platform.
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Simultaneous measurement of stress and temperature with a fiber Bragg grating based on a loop thin-wall Section Beam.
Applied Optics, 2006Co-Authors: Qida Zhao, Guiling Huang, Xiaoyi DongAbstract:We designed and demonstrated what we believe to be a novel sensor for simultaneous measurement of stress and temperature. A fiber Bragg grating is flatly adhered to the surface of a loop thin-wall Section Beam. The theoretical analyses and the experimental results show that both the central wavelength shift and the chirped bandwidth of the grating reflection spectrum have a linear relationship with the stress and the temperature, respectively, and the slopes of them are different. Therefore, the temperature and stress can be discriminated by interrogating the chirped fiber grating. Moreover, we also investigated the strain of the loop thin-wall Section Beam, and the results show that the strain is cosine proportional to the double positional angle.
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Force sensing with temperature self-compensated based on a loop thin-wall Section Beam
IEEE Photonics Technology Letters, 2006Co-Authors: Qida Zhao, Guiling Huang, Xiaoyi DongAbstract:A novel method about force sensing with temperature self-compensated based on a loop thin-wall Section Beam is proposed and demonstrated. Two identical fiber Bragg gratings are rigidly affixed on the outer surface of the Beam with the positional angle difference between the two gratings of 90/spl deg/. The wavelength space between the two reflected peaks of the gratings is proportional to the force and insensitive to temperature when the direction of the force and one of the two gratings are located along a diameter; therefore, the force sensing with temperature self-compensated can be achieved.
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A novel method for independent tuning of the center wavelength and the bandwidth of fiber Bragg grating
Journal of Lightwave Technology, 2006Co-Authors: Qida Zhao, Guiling Huang, Xiaoyi DongAbstract:A novel method for independent tuning of the center wavelength and the bandwidth of a fiber Bragg grating (FBG) was proposed and demonstrated. An FBG was adhered to the outer surface of a loop thin-wall Section Beam. The center wavelength and the bandwidth of the FBG can be tuned independently through changing the force while the fiber grating locates at different special positions. Quasi-chirp-free wavelength tuning with 6.706 nm and bandwidth tuning with 5.368 nm under quasi-shift-free center wavelength were obtained experimentally. The experimental results are in good agreement with the theoretical analyses.
Dong Kil Shin - One of the best experts on this subject based on the ideXlab platform.
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crashworthiness of aluminum cfrp square hollow Section Beam under axial impact loading for crash box application
Composite Structures, 2014Co-Authors: Dong Kil Shin, Jun Beom KwonAbstract:Abstract Crashworthiness characteristics and axial collapse with damage propagation behavior of an aluminum/CFRP hybrid square hollow Section Beam were investigated under dynamic axial crushing load for crash box application. The low speed impact test referred to the RCAR regulations was performed with five different lay-up sequences and two different laminate thicknesses. Both tip ends of hybrid specimen were clamped by a specially designed jig to assign a similar boundary condition with an auto-body crash test model. Each different direction of carbon fibers offers respective crashworthiness characteristics, and the characteristics from each direction were mixed when stacked together. The specific energy absorbed and crush force efficiency were improved simultaneously up to 38% and 30%, respectively in the Al/CFRP hybrid SHS Beam with a [0°/90°] 2 n lay-up sequence, and they were slightly improved by increasing the thickness of the CFRP laminate.
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characteristics of aluminum cfrp short square hollow Section Beam under transverse quasi static loading
Composites Part B-engineering, 2013Co-Authors: Dong Kil ShinAbstract:Abstract Energy absorption capability and bending collapse behavior of an aluminum (Al)/carbon fiber reinforced plastic (CFRP) short square hollow Section (SHS) Beam were investigated under transverse quasi-static loading. The Al SHS Beam was reinforced by CFRP, and the specimen was co-cured via an autoclave curing process. Three-point bending test was performed with five different lay-up sequences and three different laminate thicknesses. Stable bending collapse accompanying plastic hinge was observed in all specimens. Individual bending collapse behaviors were different depending on the lay-up sequences. The specific energy absorbed (SEA) was improved by up to 29.6% in the Al/CFRP SHS Beam specimen with a [0/+45°/90°/−45°] n lay-up sequence and laminate thickness of 1.168 mm (thickness ratio of Al: CFRP = 1: 0.87, 8 plies of prepreg) compared to the Al SHS Beam. The SEA was not related with damage area of the Al/CFRP SHS Beam. Finite element analysis and theoretical analysis based on Kecman’s model were performed to investigate the effect of reinforcement by CFRP on the Al SHS Beam.
Kuo Mo Hsiao - One of the best experts on this subject based on the ideXlab platform.
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Coupled axial–torsional vibration of thin-walled Z-Section Beam induced by boundary conditions
Thin-walled Structures, 2007Co-Authors: Hong Hu Chen, Kuo Mo HsiaoAbstract:Abstract The coupled axial–torsional vibration of thin-walled Z-Section Beam induced by the boundary conditions is investigated. The value of the warping function is not zero at centroid for Z-Section Beam. If the axial displacement of the pin end is restrained at the centroid of the Z-Section for thin-walled Z-Section Beam, the axial vibration and torsional vibration may be coupled. The governing equations for linear axial and torsional vibration of a thin-walled Z-Section Beam are derived by the d’Alembert principle and the virtual work principle. The bending vibration is uncoupled from axial and torsional vibrations and is not dealt with in this paper. For harmonic vibration, the general solution of these equations with undetermined constant coefficients may be obtained. Substituting the general solution into the displacement and force boundary conditions, a set of homogeneous equations can be obtained. The natural frequencies and the coefficients of the general solution may be obtained by solving the homogeneous equations using the biSection method. Numerical examples are studied to verify the accuracy of the proposed method and to investigate the effect of boundary conditions and the value of warping function at centroid on the coupled axial and torsional natural frequency of Z-Section Beam.
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More general expression for the torsional warping of a thin-walled open-Section Beam
International Journal of Mechanical Sciences, 2003Co-Authors: Kuo Mo HsiaoAbstract:Abstract In this study, an analytical formulation for the torsional warping function of a thin-walled open-Section Beam is built based on the combination of the Vlasov assumption and the Kirchhoff assumption of plate/shell theory, essentially due to Goodier and Gjelsvik. Vlasov, Timoshenko and many authors (follow Vlasov) only consider the contour warping function as the real warping function. Goodier and Gjelsvik (follow Goodier) not only consider the contour warping but also the thickness warping. For some cross-Sectional constants related to the warping function such as the torsional constant, the adoption of the warping function based on Vlasov's theory or Timoshenko's theory may cause them incorrectness. On the other hand, the torsional constant based on the Goodier's theory is consistent with the one based on the membrane analogy. Thus, Goodier's theory is a good approximation for the torsional warping of a thin-walled open-Section Beam. To the authors’ limited knowledge, the analytical expression for the complete torsional warping of a thin-walled open-Section Beam has not been found in the literature. In this study, a more general expression for the torsional warping of a thin-walled open-Section Beam is presented. The position formulas to determine the twist center are also given.