Acoustic Wave Guiding by Reconfigurable Tessellated Arrays

Zou, Chengzhe; Lynd, Danielle T.; Harne, Ryan L.

doi:10.1103/physrevapplied.9.014009

Cited by 19 publications

(13 citation statements)

References 34 publications

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“…Frequency selective surfaces created from reconfigurable origami structures have also been investigated as means to adapt RF wave transmission and radiation (Fuchi et al, 2012; Sessions et al, 2018). Similar adaptation has been achieved for arrays composed of acoustic transducers for sake of steering and modulating acoustic fields (Bilgunde and Bond, 2018; Zou et al, 2018).…”

Section: Introductionmentioning

confidence: 63%

“…Yet, it is difficult to access the tumor locations for cancers deep in the body and thus challenging to ablate tumors inaccessible by conventional large probes. Recent studies have proposed using origami-inspired transducers that fold flat for transport through the body to the point of care, whereafter the unfolded transducer focuses ultrasound at the tumor for treatment, followed by a reversal of the process to exit the body (Zou et al, 2018). Yet, the curved origami transducer surfaces proposed for such vision are not flat-foldable (Zou and Harne, 2017; Zou et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Partially activated reconfigurable arrays to guide acoustic waves

Zhao

Zou

Harne

2021

Journal of Intelligent Material Systems and Structures

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Recent studies have exemplified the potential for curved origami-inspired acoustic arrays to focus waves. Yet, reconfigurable structures that adopt curvatures are often difficult to translate to practice due to mechanical deformation of the facets that inhibit straightforward folding. In addition, not all tessellations that curve upon folding are also flat-foldable, which is a key advantage of portability inherent to many origami-inspired structures. This research introduces a new concept of partially activated reconfigurable acoustic arrays as a means to mitigate these drawbacks. Here, tessellations are studied where a subset of the facet surfaces are considered to radiate acoustic waves. The analytical results reveal focusing behaviors in such arrays that are otherwise not manifest for the array when fully activated. The focused waves are more intense in amplitude and space for partially activated arrays than fully activated counterparts. These trends are verified by experiment and are also found to be applicable to multiple reconfigurable array geometries. The results encourage broader study of the design space accessible in reconfigurable arrays to capitalize on all of the functionality afforded by origami-inspired wave guiding structures.

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Section: Introductionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Partially activated reconfigurable arrays to guide acoustic waves

Zhao

Zou

Harne

2021

Journal of Intelligent Material Systems and Structures

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“…These concepts are recently extended to the emerging area of reconfigurable acoustic wave guiding/focusing structures. For instance, tessellated water-bomb and star-based arrays of acoustic transducers studied by Lynd et al (2017) and Zou et al (2018) have wave guiding properties in the near and far field in addition to the ability to fold into compact shapes for transport. Moreover, the reconfiguration of such origami-inspired acoustic arrays empowers means to control interference phenomena and thus modulate the wave guiding properties (Lynd and Harne, 2017; Zou et al, 2018; Zou and Harne, 2017, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, nearly arbitrary curvature may be introduced into Miura-ori using gradients (Dudte et al, 2016; Gattas et al, 2013). For practices of acoustic wave focusing, it is necessary to create curvature of the activated facets to radiate waves toward a common focal region (Zou et al, 2018). Song et al (2017) studied doubly curved origami structures based on Miura-ori and adopted spherical and aspherical profiles for the curvature.…”

Section: Introductionmentioning

confidence: 99%

Acoustic wave focusing by doubly curved origami-inspired arrays

Srinivas

Harne

2020

Journal of Intelligent Material Systems and Structures

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Spherically focused transducers have been long relied on to target acoustic energy delivery. Yet, these structures have limitations with respect to size and mobility for medical treatment applications. Recent developments in the field of reconfigurable structures reveal that the ancient art of origami inspires new platforms by which to enable spherical shapes that are additionally foldable for ease of transport. This research explores the opportunities for a unique, flat foldable doubly curved tessellated array to enable wave focusing capability similar to an ideal medical transducer shape: the spherical cap transducer. An analytical model of the doubly curved array is created and validated against data collected from a proof-of-concept array. The model is then leveraged to understand how the array design and complexity relatively govern the wave focusing capability. The findings show that doubly curved acoustic arrays do not require excessive facet refinement to achieve wave focusing similar to nominal spherically focused transducers. Yet, the optimal frequencies for which such capability is borne out vary substantially on the basis of array design. The discoveries of this research motivate future consideration of flat foldable doubly curved acoustic arrays for potential implementation into medical transducer development for hard-to-access surgical treatments.

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“…It is well known that elastic structures can be designed to tune wave propagation at will [1,2]. Applications are, among others, wave focusing [3], wave guiding [4,5], acoustic cloaking [6], wave-type conversion [7], and the creation of frequency bands with high attenuation, the socalled band gaps [8][9][10][11][12]. The latter can be obtained for acoustic waves in air, but also for longitudinal, shear, surface, and flexural elastic waves.…”

Section: Introductionmentioning

confidence: 99%

Energy Distribution and Exchange Between Spatial Harmonics in Bending Wave Phononic Crystals

Damme

Zemp

2018

Phys. Rev. Applied

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Resonant metamaterials and phononic crystals are widely studied, with the aim of controlling and altering elastic wave propagation in solids. Beams with varying stiffness along the length are an archetypal example of a phononic crystal for bending waves, since the resulting nontrivial dispersion relation can be modeled analytically. In this work, the complex dispersion curve over the complete audible frequency range is measured using the inhomogeneous wave-correlation (IWC) technique, and compared to a unitcell model and an explicit model of the finite beam. Multiple band gaps, each with a different attenuation coefficient, are predicted and validated. An iterative implementation of IWC allows the identification of a spatial spectrum of wave numbers, responsible for the intricate beam displacement shape. The energy carried by the fundamental wave number and its Bloch (sub)harmonics are determined, showing that the main dispersion branch is monotonically increasing. It is shown that only a small fraction of the wave energy travels along branches with a negative slope in the first Brillouin zone. Additionally, in band gaps affecting only bending waves, energy is converted to other wave types, such as longitudinal waves. This approach offers some important insights into the physics of the wave propagation, which cannot be gathered from unit-cell modeling alone.

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Acoustic Wave Guiding by Reconfigurable Tessellated Arrays

Cited by 19 publications

References 34 publications

Partially activated reconfigurable arrays to guide acoustic waves

Partially activated reconfigurable arrays to guide acoustic waves

Acoustic wave focusing by doubly curved origami-inspired arrays

Energy Distribution and Exchange Between Spatial Harmonics in Bending Wave Phononic Crystals

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