Flexural wave attenuation in a sandwich beam with viscoelastic periodic cores

Guo, Zhiwei; Sheng, Meiping

doi:10.1016/j.jsv.2017.04.016

Cited by 28 publications

(5 citation statements)

References 48 publications

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“…In this approach, the SDOF oscillator is designed so that its natural frequency is very close to the frequency at which the host structure's vibration is to be reduced. Many researchers used SDOF oscillators for attenuating vibration in beams [11][12][13][14][15]. These studies have shown that SDOF oscillators contribute to vibration attenuation and that the low transmission zone depends on the resonance frequency of the inserted oscillator.…”

Section: Introductionmentioning

confidence: 99%

Application of Metastructures for Targeted Low-Frequency Vibration Suppression in Plates

Ghachi

Mohamed

Renno

et al. 2022

J. Vib. Eng. Technol.

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Purpose We present an approach that combines finite element analysis and genetic algorithms to find the optimal configuration of local resonators created in the host structure to suppress their vibration in a target low-frequency range. Such local resonators are indeed metastructures that alter the wave propagation in the host structure, thereby attenuating their vibration. Methods To demonstrate the approach, we cutout zigzag resonators in a thin aluminium plate that is subjected to base-excitations. The thin plate and the zigzag cutouts are modelled using the finite element method, and the optimal location and optimal tip mass of the zigzag cutouts are obtained using genetic algorithms through iterative simulations. Two case studies are considered, and the fitness function used in the optimization problem is the plate’s root mean square of vibration in a specific low-frequency range. In the first case, the plate has two aligned zigzag cutouts. In this case, the objective is to find the optimal linear location and tip masses of the two zigzag cutouts. In the second case, the plate also has two zigzag cutouts, but their linear and transverse locations can vary along with the respective tip masses. The two optimal specimens are manufactured and tested experimentally. Results Numerical results were compared to experimental results which demonstrate that the proposed approach is reliable and can be used to tune the band gap of plates, thereby maximizing the vibration attenuation in the target frequency range. Conclusion Genetic algorithms can be used along with finite element analysis and zigzag cutouts to tune the band gap of plates subjected to base-excitations. The approach can be extended to plates/structures with other types of excitations and boundary conditions.

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Section: Introductionmentioning

confidence: 99%

Application of Metastructures for Targeted Low-Frequency Vibration Suppression in Plates

Ghachi

Mohamed

Renno

et al. 2022

J. Vib. Eng. Technol.

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show abstract

“…[3][4][5][6][7]. At present, some researchers have introduced PCs into civil engineering to control vibration [8][9][10][11][12], especially in beams [13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…The band gap characteristics of flexural vibration in a two-dimensional periodic frame structure composed of locally resonant composite beams were studied by Zhang et al [20]. Guo et al [21] revealed the flexural vibration attenuation performance of traditional periodic constraint layer damping in a sandwich beam, and pointed out that flexural vibration can be attenuated by both the Bragg scattering effect and damping effect, where the attenuation level is mainly dominated by Bragg scattering in the band gaps and by damping in the pass bands. Tang et al [22] discussed flexural vibration propagation and attenuation through a Timoshenko beam coupled with periodic resonators by the method of a reverberation-ray matrix, their numerical results showing that the coupling between the beam and the resonators results in a local resonant attenuation band and multiple non-local resonant attenuation bands.…”

Section: Introductionmentioning

confidence: 99%

Study on Tunable Band Gap of Flexural Vibration in a Phononic Crystals Beam with PBT

Zhao

Yuan

et al. 2021

Crystals

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Low-frequency flexural vibration plays a significant role in beam vibration control. To efficiently attenuate the propagation of flexural vibration at a low-frequency range, this paper proposes a new type of a phononic crystals beam with an adjustable band gap. The governing equations of flexural vibration in a periodic beam are established based on the Euler theory and Timoshenko theory. The band structures are calculated by the plane wave expansion method, the attenuation properties and transmission response curves with a finite periodic beam are calculated by the spectral element method and finite element method. The effects of the elastic foundation and axial stress on band gaps are discussed in detail, and the regulation of the temperature field on the band gap is emphatically studied. The theoretical and numerical results show that the elastic foundation and axial stress have significant influence on the band gap, and the location and width of the band gaps can be adjusted effectively when the Young’s modulus of PBT is changed by a varying temperature. The results are very useful for understanding and optimizing the design for composite vibration isolation beams.

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“…In [47] Badran et al developed a lighter model to simulate the dynamic behaviour of sandwich structures. Guo et al [48] examined theoretically the banded behaviour of a sandwich structure using two periodically alternating viscoelastic materials as core, achieving low-frequency (∼ 100 Hz) stop bands while compromising its load-bearing capabilities. Also, the effect of damping on the band gap was con-sidered and in [49] Sheng et al manufactured the same structure to examine it experimentally.…”

Section: Introductionmentioning

confidence: 99%

Mid-frequency band gap performance of sandwich composites with unconventional core geometries

Ampatzidis

Chronopoulos

2019

Composite Structures

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In this work novel unconventional core architectures are presented which are able to induce flexural band gaps while not being detrimental for structural bending stiffness of the sandwich structures. Two different core schemes are examined with both of them exhibiting low-frequency stop bands. While unconventional, the designs of the core offer a novel solution which can be easily manufactured in high volume parts using two-dimensional automated cutting machine. A hybrid finite element and periodic structure theory scheme is employed for the calculation of the stiffness and mass matrices, and periodic structure theory is used to obtain the wave propagation of the beams. Having acquired the wave dispersion curves and the finite element analysis' results, two specimens are manufactured using carbon fibre cured plates and commercially available PVC foam as core material. Experimental measurements of the dynamic performance of the structures are conducted using a laser vibrometer and electrodynamic shaker setup.

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Flexural wave attenuation in a sandwich beam with viscoelastic periodic cores

Cited by 28 publications

References 48 publications

Application of Metastructures for Targeted Low-Frequency Vibration Suppression in Plates

Application of Metastructures for Targeted Low-Frequency Vibration Suppression in Plates

Study on Tunable Band Gap of Flexural Vibration in a Phononic Crystals Beam with PBT

Mid-frequency band gap performance of sandwich composites with unconventional core geometries

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