Nonlinear elastic switch based on solid–solid phononic crystals

Motaei, Farzaneh; Bahrami, Ali

doi:10.1007/s10853-020-04705-4

Cited by 22 publications

(12 citation statements)

References 28 publications

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“…Figure 8 is a graphical expression of extinction ratio which can be defined as 8 where U High indicates the displacement of wave confined in desired port, and U low is the displacement at the other undesired ports. The extinction ratio for designed elastic fibers is equal to − 23 dB in the worst case.…”

Section: Discussionmentioning

confidence: 99%

“…Existence of scatterers in a background with diverse physical properties makes frequency band gaps in the phononic crystal dispersion curve 4 . Some of the phononic crystal applications are in acoustic waveguides 5 , material detecting sensors 6 , 7 , mechanical wave switches 8 , 9 , frequency filters 10 , 11 , energy harvesters 12 – 17 , demultiplexers 10 , 18 , and elastic fiber as a new device 3 .…”

Section: Introductionmentioning

confidence: 99%

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Energy harvesting from sonic noises by phononic crystal fibers

Motaei

Bahrami

2022

Sci Rep

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In this investigation, a phononic crystal-based fiber is proposed for energy harvesting application in metalworking factories. Phononic crystal plays the role of cladding in elastic fiber structure. Each of single-core fibers includes a tungsten hollow cylinder in central region which its internal radius is different in three single-core fibers. Incident waves with central frequency from 25 to 40 kHz of 1/3 octave band are confined in the core region of proposed elastic fibers and transmitted to desired distance. High confinement and transmission ability without significant longitudinal loss make this structure distinct from the other phononic crystals-based energy harvesters. By utilizing of a piezoelectric film at the end of fiber cores, mechanical energy is converted to electrical energy. As proposed elastic fibers confine the applied waves with high quality, the obtained output power is enhanced up to 800 times in comparison with the bare case. Maximum value of extinction ratio between all single core fibers is equal to − 23 dB. Also, longitudinal loss is almost equal to 0.9 dB/km.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy harvesting from sonic noises by phononic crystal fibers

Motaei

Bahrami

2022

Sci Rep

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“…It has been reported that the PnC can realize switching behavior by combining the PnBG and nonlinear wave propagation [6][7][8]. This is because the boundary of a dispersion band, i.e., the maximum or minimum frequency of the band, shifts due to the effect of the nonlinearity.…”

Section: Introductionmentioning

confidence: 99%

Modeling of a lattice model for nonlinear wave propagation in phononic crystals

Takayanagi

Doi

Nakatani

2023

NOLTA

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We construct a nonlinear lattice model to investigate the dynamics of nonlinear behavior in phononic crystals (PnCs). Two types of mass points and springs are introduced in the model to reproduce the difference in material properties between the scatterers and background in PnCs. The nonlinearity is introduced to the model by changing the mass of each mass point depending on the displacement gradient at the mass point. We numerically confirm that both the 1D and 2D models have the bandgap in the linear dispersion relation. Moreover, in both model, switching behavior of wave propagation is found.

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“…The non-linear behavior of mass density was explored by increasing the applied force to the structure, and the Schrodinger nonlinear equation (NSE) was proposed as an explanation. Motaei et al successfully designed 1×1 and 1×2 switches based on this non-linear behavior, altering the direction of wave propagation by increasing the applied pressure intensity to the switch [24][25].…”

Section: Introductionmentioning

confidence: 99%

Two-bit Analog to Digital Converter based on Acoustic Directional Coupler

Tahriri,

Bahrami,

Motaei

2023

Preprint

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This study explores the novel application of a solid-state phononic crystal (PnC)-based analog-to-digital converter (ADC). To ensure a ripple-free output, a coupler is utilized, enabling 2-bit quantization. As the input amplitude increases, the structure exhibits non-linear behavior. This non-linearity emerges from an augmented displacement gradient, resulting in a corresponding alteration in mass density. The phononic crystal matrix consists of a 13×20 array of iron rods embedded within a PMMA host material. The system operates at a frequency of 67.5 kHz. A directional coupler is utilized to direct the emitted wave. For the designed model, we have considered transmission less than 0.3 to be logically equivalent to "0" and more than that to be logically equivalent to "1". Also, in order for both outputs to be on, transmission from 0.4 to 0.6 is equivalent to " 1" we have considered. The manufacturing tolerance of the converter is 0.03.

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Nonlinear elastic switch based on solid–solid phononic crystals

Cited by 22 publications

References 28 publications

Energy harvesting from sonic noises by phononic crystal fibers

Energy harvesting from sonic noises by phononic crystal fibers

Modeling of a lattice model for nonlinear wave propagation in phononic crystals

Two-bit Analog to Digital Converter based on Acoustic Directional Coupler

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