Conveners
A10.06/A12.10 Acoustic wave propagation in complex media: S065
- Malte Peter (University of Augsburg)
- Tristan Lawrie (University of Exeter)
A10.06/A12.10 Acoustic wave propagation in complex media: P526
- Tristan Lawrie (University of Exeter)
- Malte Peter (University of Augsburg)
A10.06/A12.10 Acoustic wave propagation in complex media: S301
- Malte Peter (University of Augsburg)
- Tristan Lawrie (University of Exeter)
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Robyn Edge (University of Exeter)08/09/2026, 13:20A10 Materials and Metamaterials
We present a non-Hermitian inverse-design protocol for engineering wave propagation in non-local mass–spring lattices, enabling the creation of exotic dispersion phenomena in elastic media. By extending inverse-design methods to complex frequencies and incorporating velocity-dependent, non-conservative behaviours in the governing equations, both the real band structures and their associated...
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Kei Matsushima (Hiroshima University)08/09/2026, 13:40A10 Materials and Metamaterials
Rayleigh–Bloch waves are guided modes localized around periodic arrays with unbounded unit cells, and they play an important role in resonant wave scattering by diffraction gratings. In this work, we extend a Riemann-sheet tracking framework for Rayleigh–Bloch waves to two-dimensional acoustic gratings composed of penetrable scatterers. The problem is formulated as a quasi-periodic...
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Malte Peter (University of Augsburg)08/09/2026, 14:00A10 Materials and Metamaterials
The term rainbow trapping commonly refers to using graded arrays for amplification of waves at chosen locations according to frequency. In the context of wave-energy harvesting, Chaplain et al. (NewJ. Phys. 22:063024, 2020) showed the benefits of grading such that amplifications are associated to bandcrossings within Brillouin zones rather than at their edges, referring to the latter as...
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Ahmed Mehrem (German Institutes of Textile and Fiber)08/09/2026, 14:00A10 Materials and Metamaterials
A 1D finite-difference time-domain (FDTD) simulation is proposed for the acoustic characterisation of multilayer textile absorbers. Dissipative mechanisms are derived directly from five measurable microstructural parameters per layer, open porosity, airflow resistivity, tortuosity, and viscous and thermal characteristic lengths, through the Johnson–Champoux–Allard (JCA) equivalent-fluid model....
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Felix Langfeldt (University of Southampton)08/09/2026, 15:00A10 Materials and Metamaterials
Vibro-acoustic metamaterial plates (VAMPs) consist of a thin baseplate with periodically distributed structural resonators. Through band gaps generated by localised resonances, VAMPs can achieve high sound transmission loss (STL) over targeted frequency ranges, with the potential to outperform mass-equivalent homogeneous plates. This makes VAMPs promising for low-frequency noise control using...
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Gal Ben Yelid (Tel Aviv University)08/09/2026, 15:20A10 Materials and Metamaterials
We study the problem of trapping acoustic waves in a waveguide using a local realization of flatband-supporting non-Hermitian interactions. These interactions are implemented via active feedback control, using loudspeakers driven by non-collocated microphone measurements to synthesize the desired coupling within a confined region of the waveguide. The design is inspired by PT-symmetric...
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Tomasz G. Zieliński (Institute of Fundamental Technological Research, PAS)08/09/2026, 15:40A10 Materials and Metamaterials
Thin layers of acoustic metamaterials can exhibit remarkable low-frequency sound absorption when their microstructures contain long, tortuous channels or coiled resonators. This is because the coiled, spiral or labyrinthine channels require a relatively small material thickness to significantly extend the path of oscillatory viscous flows induced by airborne acoustic waves that penetrate the...
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David Chappell (Nottingham Trent University)08/09/2026, 16:00A10 Materials and Metamaterials
The accurate prediction of high-frequency wave behaviour is essential for engineering applications related to noise and vibration control, but traditional finite- and boundary-element approaches typically become computationally impractical at these frequencies. We will present a transport-based framework for high frequency waves, formulated using the stationary Radiative Transfer Equation...
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