Tacticity in chiral phononic crystals

Bergamini, Andrea; Miniaci, Marco; Delpero, Tommaso; Tallarico, Domenico; Damme, Bart Van; Hannema, Gwenael; Leibacher, Ivo; Zemp, Armin

doi:10.1038/s41467-019-12587-7

Cited by 66 publications

(33 citation statements)

References 42 publications

(36 reference statements)

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“…[101] "Macrostructures" can also be fabricated via inexpensive powder-bed fusion techniques such as SLS and selective laser melting (SLM). [102][103][104][105] Recently, broadband acoustic transmission at the water-to-air interface was demonstrated by SLSprinted Nylon (FS3300PA) structures ( Figure 2g). [83] The metasurface allowed almost-perfect underwater transmission at resonance, by creating architected bubble formations using the intrinsically hydrophobic-printed frame.…”

Section: Printing Technologiesmentioning

confidence: 99%

Fabricating and Assembling Acoustic Metamaterials and Phononic Crystals

et al. 2020

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Acoustic metamaterials (AMMs) and phononic crystals (PCs) have garnered significant attention in recent years, as part of the collective driving force toward creating intelligent acoustic devices. Advancements in these fields have greatly enhanced the way we manipulate sound waves through transmission, reflection, refraction, absorption, diffraction, or attenuation. In the past decade, AMMs and PCs have enabled novel applications such as acoustic lensing, [1-3] cloaking, [4] levitation, [5] and holography. [6-8] While these exotic structures have been well explored through theoretical and numerical analysis, [9-13] their physical realization is an important topic that is rarely discussed. Considering the ubiquity of sound and the powerful capabilities of AMMs and PCs, the impact of these acoustic structures could be phenomenal. Across the full acoustic frequency spectrum, practical applications such as noise cancellation, [14] underwater detection, [15] medical imaging, [16] and energy harvesting [17,18] could benefit key sectors in our society like healthcare, well-being, environmental sustainability, and security. Moreover, AMMs and PCs can help to usher in next-generation technologies for personalized, immersive multisensory [19-22] experiences. The manipulation of sound can enrich the way we communicate and interact with our surroundings, not simply through audio, but also through tactile sensations. In the future, AMMs and PCs could be used in virtual reality (VR) setups, [23] compact wearable devices, and dynamic midair volumetric displays [24] that are controllable and capable of providing haptic feedback. [25] Beyond the notion that AMMs and PCs can replace phased arrays, they could readily complement one another for more precise control. In commercial devices, AMM and PC functionalities could even be combined together in different ways, e.g., transmissive and sound absorptive structures, for improved performance. To unlock the full potential of AMMs and PCs, it is therefore vital to ensure that practical, physical realization is pursued alongside theoretical investigation in the development of viable acoustic designs. Building an AMM or PC requires some form of fabrication or assembly or both. Fabrication refers to the technologies and processes used to manufacture an object, whereas assembly refers to the strategic amalgamation of parts for a constructive purpose.

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Section: Printing Technologiesmentioning

confidence: 99%

Fabricating and Assembling Acoustic Metamaterials and Phononic Crystals

et al. 2020

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“…However, there are limited publications, especially in the field of mechanical metamaterials. Devices that exploit the rotational inertia of the resonator, such as chiral structures [ 34 , 35 , 36 , 37 , 38 ] or gyroscopic spinners [ 29 ], are the most popular designs of directional amplifiers in periodic structures, where the longitudinal motion of the finite size mass elements is coupled to their rotation, following a spin. Directional amplification systems have also been implemented in other scientific fields, such as quantum information processing [ 39 ] in terms of controlling amplification and directionality of electromagnetic signals [ 40 ] as well as in photonic systems [ 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

2D Dynamic Directional Amplification (DDA) in Phononic Metamaterials

2021

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Phononic structures with unit cells exhibiting Bragg scattering and local resonance present unique wave propagation properties at wavelengths well below the regime corresponding to bandgap generation based on spatial periodicity. However, both mechanisms show certain constraints in designing systems with wide bandgaps in the low-frequency range. To face the main practical challenges encountered in such cases, including heavy oscillating masses, a simple dynamic directional amplification (DDA) mechanism is proposed as the base of the phononic lattice. This amplifier is designed to present the same mass and use the same damping element as a reference two-dimensional (2D) phononic metamaterial. Thus, no increase in the structure mass or the viscous damping is needed. The proposed DDA can be realized by imposing kinematic constraints to the structure’s degrees of freedom (DoF), improving inertia and damping on the desired direction of motion. Analysis of the 2D lattice via Bloch’s theory is performed, and the corresponding dispersion relations are derived. The numerical results of an indicative case study show significant improvements and advantages over a conventional phononic structure, such as broader bandgaps and increased damping ratio. Finally, a conceptual design indicates the usage of the concept in potential applications, such as mechanical filters, sound and vibration isolators, and acoustic waveguides.

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“…By choosing an appropriate mesoscopic scale, optical 3 , acoustic 4 , and elastic 2 wave processes can be altered at will. Some notable desired effects are cloaking 5,6 , sound absorption 7 , vibration isolation 8 , or wave guiding 9 . Most successful designs, which already found their way to applications, rely on efficient models of wave dispersion within periodic media 10 .…”

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confidence: 99%

“…It is however possible to reduce the resonance frequency of purely mechanical structures by coupling degrees of freedom in two and three dimensions. The structure's motion in the vibration direction leads to the excitation of additional inertial elements, either translational (point masses) 25 or rotational (disks) 8 . The coupled motion results in an apparent increase of mass, leading to a much lower eigenfrequency using a minor increase in weight and without loss of stiffness.…”

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Inherent non-linear damping in resonators with inertia amplification

Damme

Hannema

Souza

et al. 2021

Applied Physics Letters

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Inertia amplification is a mechanism coupling degrees of freedom within a vibrating structure. Its goal is to achieve an apparent high dynamic mass and, accordingly, a low resonance frequency. Such structures have been described for use in locally resonant metamaterials and phononic crystals to lower the starting frequency of a bandgap without adding mass to the system. This study shows that any non-linear kinematic coupling between translational or rotational vibrations leads to the appearance of amplitude-dependent damping. The analytical derivation of the equation of motion of a resonator with inertia amplification creates insight in the damping process and shows that the vibration damping increases with its amplitude. The theoretical study is validated by experimental evidence from two types of inertia-amplification resonators. Finally, the importance of amplitude-dependent damping is illustrated when the structure is used as a tuned mass damper for a cantilever beam.

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Tacticity in chiral phononic crystals

Cited by 66 publications

References 42 publications

Fabricating and Assembling Acoustic Metamaterials and Phononic Crystals

Fabricating and Assembling Acoustic Metamaterials and Phononic Crystals

2D Dynamic Directional Amplification (DDA) in Phononic Metamaterials

Inherent non-linear damping in resonators with inertia amplification

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