Study of tunable locally resonant metamaterials: Effects of spider-web and snowflake hierarchies

Sepehri, Soroush; Jafari, Hamid; Mashhadi, Mahmoud Mosavi; Yazdi, Mohammad Reza Hairi; Fakhrabadi, Mir Masoud Seyyed

doi:10.1016/j.ijsolstr.2020.08.014

Cited by 34 publications

(10 citation statements)

References 64 publications

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“…Although many types of webs can be extremely efficient in detecting and stopping prey, 128 plane structures tend to be preferred when it comes to bioinspired systems, because of their simplicity. Metamaterials can be designed to exploit the rich dynamic response and wave attenuation mechanism of orb webs, 129 based on locally resonant mechanisms to achieve band gaps in desired frequency ranges, 130 and further optimized to achieve advanced functionalities. 131 The possibility of designing lowfrequency sound attenuators is also regarded as a common objective in metamaterials design, and spiderweb-inspired structures seem to be able to provide lightweight solutions to achieve this goal.…”

Section: Sensing and Predationmentioning

confidence: 99%

Optimized structures for vibration attenuation and sound control in nature: A review

Bosia

Poggetto

Gliozzi

et al. 2022

Matter

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Section: Sensing and Predationmentioning

confidence: 99%

Optimized structures for vibration attenuation and sound control in nature: A review

Bosia

Poggetto

Gliozzi

et al. 2022

Matter

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“…According to several parametric design studies [ 43 , 55 ] in wave propagation and bandgap analysis, it is important to analyze the coverage percentages of the filtering area. Figure 5 b depicts the variation of bandgap coverage between the frequency range

.…”

Section: Resultsmentioning

confidence: 99%

“…Unit cell geometrical parameters play an important role in the dynamic behaviour and wave-propagation properties of periodic structures. It has been shown that the conventional square lattice unit cell ( Figure 1 a) is not able to attain a bandgap area in low-frequency vibrations, partly due to mean node connectivity [ 43 ] and balanced mass spread in all areas of the unit cell [ 44 ]. As represented by Sepehri et al [ 43 ], the mean connectivity issue may be addressed by adding more beams and nodes to the basic unit cells due to the hierarchy of conventional structures like square and hexagon.…”

Section: Methodsmentioning

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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“…Preferred directions of propagation (θ = 0 and θ = 90 o , i.e., +x and +y directions of the square lattice) are also revealed, thus indicating a strong anisotropic behavior. Sepehri et al (2020) have expanded this concept by introducing spider web-inspired hierarchical structures in hexagonal lattices, thus facilitating the opening of locally resonant band gaps in close frequency ranges, with a second band gap opened in the frequency range equal to 1.39-1.51 times the fundamental resonant frequency of the considered beams. Also based on the exploitation of locally resonant band gaps, Zhao et al (2022) have proposed tunable spider web-inspired resonators, showing that multiple locally resonant band gaps can be achieved by increasing the fractal order of the structure.…”

Section: Spider Websmentioning

confidence: 99%

Bioinspired acoustic metamaterials: From natural designs to optimized structures

Poggetto

2023

Front. Mater.

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Artificial structures known as phononic crystals and acoustic metamaterials can be designed by spatially arranging one or more materials to obtain desired wave manipulation characteristics. The combination of various materials in complex composites is also a common feature of biological systems, which have been shaped in the course of evolution to achieve excellent properties in various requisites, both static and dynamic, thus suggesting that bioinspired concepts may present useful opportunities to design artificial systems with superior dynamic properties. In this work, a set of biological systems (nacre composites, spider webs, fractals, cochlear structures, and moth wings) and corresponding bioinspired metamaterials are presented, highlighting their main features and applications. Although the literature on some systems is vast (e.g., fractals), spanning multiple length scales for both structural and acoustic applications, much work remains to be explored concerning other biological structures (e.g., moth wings). Especially, bioinspired systems achieved by considering diverse objectives seem to be a promising yet relatively unexplored field of research.

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Study of tunable locally resonant metamaterials: Effects of spider-web and snowflake hierarchies

Cited by 34 publications

References 64 publications

Optimized structures for vibration attenuation and sound control in nature: A review

Optimized structures for vibration attenuation and sound control in nature: A review

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

Bioinspired acoustic metamaterials: From natural designs to optimized structures

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