Damping effects on wave-propagation characteristics of microtubule-based bio-nano-metamaterials

Jafari, Hamid; Yazdi, Mohammadreza Haeri; Fakhrabadi, Mir Masoud Seyyed

doi:10.1016/j.ijmecsci.2020.105844

Cited by 18 publications

(5 citation statements)

References 62 publications

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“…This can also be realized from the steadiness of the branch on the upper side of the proposed band gap (Purple line, associated with the local 6th model shape). Except for the high symmetric point of M, which has phonon-phonon scattering because of veering in the dispersion curves, the rest of the branch is a straight line indicating the local resonance [ 56 ].…”

Section: Resultsmentioning

confidence: 99%

Analysis of an Adaptive Periodic Low-Frequency Wave Filter Featuring Magnetorheological Elastomers

Jafari

2023

Polymers

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This study aims to enhance and tune wave-propagation properties (Bandgaps) of periodic structures featuring magnetorheological elastomers (MREs). For this purpose, first, a basic model of periodic structures (square unit cell with cross-shaped arms), which does not possess noise filtering properties in the conventional configuration, is considered. A passive attenuation zone is then proposed by adding a cylindrical core mass to the center of the conventional geometry and changing arm angles, which permitted new bandgap areas. It was shown that better wave-filtering performance may be achieved by introducing a large radius of the cylindrical core as well as low negative cross-arm angles. The modified configuration of the unit cell was subsequently utilized as the basic model for the development of magnetoactive metamaterial using a MRE capable of varying the bandgaps areas upon application of an external magnetic field. The finite element model of the proposed MRE-based periodic unit cell was developed, and the Bloch theorem was employed to systematically investigate the ability of the proposed adaptive periotic structure to attenuate low-frequency noise and vibration. Results show that the proposed MRE-based periodic wave filter can provide wide bandgap areas which can be adaptively changed and tuned using the applied magnetic field. The findings in this study can provide an essential guide for the development of novel adaptive periodic structures to filter low-frequency noises in the wide frequency band.

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Section: Resultsmentioning

confidence: 99%

Analysis of an Adaptive Periodic Low-Frequency Wave Filter Featuring Magnetorheological Elastomers

Jafari

2023

Polymers

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“…32 For the investigation of static and dynamic properties of lattice materials made of assembled beams, researchers often neglect the effects of shear deformation. [33][34][35][36][37] Although this assumption may be true for very slender beams, neglecting the shear deformation in the structural analysis of such materials with smaller length-to-thickness ratios of the constituent beams can lead to less accurate results, evidenced by analysis of the conventional mechanical structures. [38][39][40] Furthermore, some studies were performed on the effect of shear deformations on wave-propagation properties of the periodic materials.…”

Section: Introductionmentioning

confidence: 99%

Wave propagation and directionality in two-dimensional periodic lattices considering shear deformations

Sepehri

Mashhadi

Fakhrabadi

2022

Proceedings of the Institution of Mechanical Engineers, Part N:

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The effects of shear deformation on analysis of the wave propagation in periodic lattices are often assumed negligible. However, this assumption is not always true, especially for the lattices made of beams with smaller aspect ratios. Therefore, in the present paper, the effect of shear deformation on wave propagation in periodic lattices with different topologies is studied and their wave attenuation and directionality performances are compared. Current experimental limitations make the researchers focus more on the wave propagation in the direction perpendicular to the plane of periodicity in micro/nanoscale lattice materials while for their macro/mesoscale counterparts, in-plane modes can also be analyzed as well as the out-of-plane ones. Four well-known topologies of hexagonal, triangular, square, and Kagomé are considered in the current paper and their wave propagation is investigated both in the plane of periodicity and in the out-of-plane direction. The finite element method is used to formulate the governing equations and Bloch’s theorem is used to solve the dispersion relations. To investigate the effect of shear deformation, both the Timoshenko and Euler-Bernoulli beam theories are implemented. The results indicate that including shear deformation in wave propagation has a softening effect on the band diagrams of wave propagation and moves the dispersion branches to lower frequencies. It can also reveal some bandgaps that are not predicted without considering the shear deformation.

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“…Variants including phononic crystals (Croe¨nne et al, 2011;Martinsson and Movchan, 2003;Yang et al, 2004) have been demonstrated for acoustic cloaking (Cummer and Schurig, 2007;Norris, 2008) and energy harvesting (Gonella et al, 2009). They have been conceived on scales ranging from ''meta-composites'' (Kushwaha et al, 1993;Mei et al, 2006) or ''meta-surfaces'' (Ma et al, 2014) with sub-scale inclusions (Jafari et al, 2020;Lakes et al, 2001) to infrastructural elements for built environments. AM have been designed to address broadband wave mitigation (Chen et al, 2016;Fang et al, 2017;Tan et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Exploring mechanical assonance for impact energy harvesting using acoustic metamaterials

Afework

Manimala

2021

Journal of Intelligent Material Systems and Structures

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Acoustic metamaterials are engineered to possess unique dynamic properties that are not commonly found in nature. It has been demonstrated that customizing the characteristics of their local features can help optimize their dynamic performance under specific loading conditions. Drawing inspiration from the literary device called “assonance,” the term “mechanical assonance” may be ascribed to the dynamic phenomenon realized by sequencing oscillators with tuned responses within a waveguide to engineer a prescribed wave transformation across it. In this context, assonance provides a framework to utilize resonant local features within a host structure or material and interactive mechanisms thereof as building blocks to create enriched functionalities for acoustic metamaterials. Using a discrete element representation for an acoustic metamaterial barrier (AMB), a numerical study is conducted to ascertain parametric dependence for assonant mechanisms related to resonator frequencies, their sequencing, and host material stiffness. Normalized metrics are extracted to estimate transmitted pulse mitigation under impact-type loading. It is found that resonator sets with octave spacing having the number of resonators of a specific frequency proportional to that frequency’s amplitude in the input spectrum is desirable for lower transmissibility. Further, sequencing the lowest frequency resonator set closest to the incident-side gives better performance. Engineering a high degree of impedance mismatch between host material sections is also preferable. The energy sequestered by the local resonators can be harvested utilizing the resonator’s mass as the multifunctional kernel for a linear electromagnetic generator. A multiphysical model is developed to predict the harvested electric voltage and power from the AMB and validated using proof-of-concept experiments. Finally, various coil placement and voltage rectification schemes are also studied using simulations to ascertain preferable design configurations.

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Damping effects on wave-propagation characteristics of microtubule-based bio-nano-metamaterials

Cited by 18 publications

References 62 publications

Analysis of an Adaptive Periodic Low-Frequency Wave Filter Featuring Magnetorheological Elastomers

Analysis of an Adaptive Periodic Low-Frequency Wave Filter Featuring Magnetorheological Elastomers

Wave propagation and directionality in two-dimensional periodic lattices considering shear deformations

Exploring mechanical assonance for impact energy harvesting using acoustic metamaterials

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