Experimental study on slow flexural waves around the defect modes in a phononic crystal beam using fiber Bragg gratings

Chuang, Kuo-Chih; Zhang, Zhiqiang; Wang, Huaxin

doi:10.1016/j.physleta.2016.09.055

Cited by 44 publications

(22 citation statements)

References 27 publications

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“…Unless the cladding of the FBG are partially removed by side-polishing or hydrofluoric (HF) acid etching, submerged FBGs are intrinsically insensitive to surrounding fluid because of the well-screened core mode coupling [28]. The FBG, often used as strain sensors for structural health monitoring [29], has not been used as point-wise displacement sensors in the applications of the phononic crystals until the work recently published in [30]. Based on the fiber Bragg grating (FBG) sensing technique proposed in [30], we setup an FBG displacement sensing system to measure the displacement transmission of the submerged PC beam.…”

Section: Experimental and Theoretical Validation And Discussionmentioning

confidence: 99%

“…The FBG, often used as strain sensors for structural health monitoring [29], has not been used as point-wise displacement sensors in the applications of the phononic crystals until the work recently published in [30]. Based on the fiber Bragg grating (FBG) sensing technique proposed in [30], we setup an FBG displacement sensing system to measure the displacement transmission of the submerged PC beam. To the authors' best knowledge, this is the first experimental study of fluid-solid coupling on the PC beam through displacement transmission using the point-wise FBG displacement sensing technique.…”

Section: Experimental and Theoretical Validation And Discussionmentioning

confidence: 99%

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Experimental and Theoretical Investigation of Lowering the Band Gaps of Phononic Crystal Beams through Fluid-Solid Coupling

et al. 2017

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Abstract:We experimentally and theoretically investigate the band-gap and transmission properties of phononic crystal (PC) beams immersed in water. Spectral element method (SEM) is developed for theoretical analysis in which the hydrodynamic loading is taken into consideration. Influence of the hydrodynamic loading on band-gap and transmission properties of the PC beams are studied. To directly detect the displacement transmission of a fully or partially submerged PC beam, a fiber Bragg grating (FBG) displacement sensing system is set up. Agreement between the experimental results and theoretical/numerical calculations also indicates the excellent dynamic sensing performance of the FBG sensing system in the research of the fluid-structure interaction (FSI) problem. Obvious lowering of the band gaps due to fluid-solid coupling is clearly demonstrated. The results in this work might be useful in research such as active tuning of the band gap and transmission properties of the PCs through fluid-solid coupling.

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Section: Experimental and Theoretical Validation And Discussionmentioning

confidence: 99%

Section: Experimental and Theoretical Validation And Discussionmentioning

confidence: 99%

Experimental and Theoretical Investigation of Lowering the Band Gaps of Phononic Crystal Beams through Fluid-Solid Coupling

et al. 2017

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“…Considering the cross-section is rectangular, the area and the second moment of inertia are calculated and the shear coefficient is directly specified. Among the material parameters, the Young's modulus of the PMMA is experimentally obtained beforehand by matching the steel ball impact-induced frequency responses of a PMMA plate to those predicted by the finite element simulations [65]. All the other material parameters are given by referring to a materials handbook [71].…”

Section: Validation Of Theoretical Methods By Experimental Measurementmentioning

confidence: 99%

“…The resulting transmission spectra are provided and compared with the counterpart results by experiment as well as by FEM with various element sizes in Figure 6. The experiment is based on the fiber Bragg grating (FBG) displacement sensing system proposed in [65], where the other setups and the experiment process are also given. The FEM simulation is performed by the COMSOL Multiphysics ® software (Comsol Inc., Stockholm, Sweden), and the modeling process can be referred to literature [72].…”

Section: Validation Of Theoretical Methods By Experimental Measurementmentioning

confidence: 99%

“…However, for analyzing the dispersion characteristics or the transmission spectra of the defected phononic crystal beam, it is appropriate to employ the system model in Figure 1 by virtue of the supercell technique [5,65] and the Floquet-Bloch theorem [4,6,15]. To differentiate the beams and joints in different unit cells, the cell number is attached afterwards as necessary.…”

Section: Analysis Modelmentioning

confidence: 99%

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Analysis of Bending Waves in Phononic Crystal Beams with Defects

Guo

Chuang

2018

Crystals

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Existing investigations on imperfect phononic crystal beams mainly concern periodic multi-span beams carrying either one or two channel waves with random or deterministic disorder in span-length. This paper studies the two channel bending waves in phononic crystal beams consisting of many phases of materials with defects introduced as one structural segment having different cross-sectional dimensions or material parameters. The method of reverberation-ray matrix (MRRM) based on the Timoshenko beam theory, which can conduct high-frequency analysis, is extended for the theoretical analysis of dispersion and transmission of bending waves. The supercell technique and the Floquet-Bloch theorem are adopted for modeling the dispersion characteristics, and the whole finite structural model is used to calculate the transmission spectra. Experimental measurements and numerical calculations are provided to validate the displacement transmission obtained by the proposed MRRM, with the effect of damping on transmission spectra being concerned. The high-frequency calculation applicability of the proposed MRRM is also confirmed by comparing the present results with the corresponding ones either using the transfer matrix method (TMM) or MRRM based on Euler-Bernoulli beam theory. The influences of defect size, defect form, and unit-cell number on the transmission spectra and the band structures are discussed. The drawn conclusions may be useful for designing or evaluating the defected phononic crystal beams in bending wave control. In addition, our conclusions are especially potential for identifying the defect location through bending wave signals.

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Periodically arranged acoustic metamaterial in industrial applications: The need for uncertainty quantification

et al. 2020

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Experimental study on slow flexural waves around the defect modes in a phononic crystal beam using fiber Bragg gratings

Cited by 44 publications

References 27 publications

Experimental and Theoretical Investigation of Lowering the Band Gaps of Phononic Crystal Beams through Fluid-Solid Coupling

Experimental and Theoretical Investigation of Lowering the Band Gaps of Phononic Crystal Beams through Fluid-Solid Coupling

Analysis of Bending Waves in Phononic Crystal Beams with Defects

Periodically arranged acoustic metamaterial in industrial applications: The need for uncertainty quantification

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