Real-Time Immersion of Physical Experiments in Virtual Wave-Physics Domains

Becker, Theodor; Börsing, Nele; Haag, Thomas; Bärlocher, Christoph; Donahue, Carly M.; Curtis, Andrew; Robertsson, Johan O. A.; Manen, Dirk‐Jan van

doi:10.1103/physrevapplied.13.064061

Cited by 11 publications

(23 citation statements)

References 37 publications

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“…2C). The normal particle velocity is then approximated using the pressure gradient in the normal direction ( 26 , 33 ). All microphones are mounted flush with the inside of the front PMMA plate to minimize their impact on the pressure field.…”

Section: Methodsmentioning

confidence: 99%

Broadband acoustic invisibility and illusions

et al. 2021

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Rendering objects invisible to impinging acoustic waves (cloaking) and creating acoustic illusions (holography) has been attempted using active and passive approaches. While most passive methods are inflexible and applicable only to narrow frequency bands, active approaches attempt to respond dynamically, interfering with broadband incident or scattered wavefields by emitting secondary waves. Without prior knowledge of the primary wavefield, the signals for the secondary sources need to be estimated and adapted in real time. This has thus far impeded active cloaking and holography for broadband wavefields. We present experimental results of active acoustic cloaking and holography without prior knowledge of the wavefield so that objects remain invisible and illusions intact even for broadband moving sources. This opens previously inaccessible research directions and facilitates practical applications including architectural acoustics, education, and stealth.

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Section: Methodsmentioning

confidence: 99%

Broadband acoustic invisibility and illusions

et al. 2021

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“…Using equations (10) and (20), we can rewrite the right-hand sides of equations (23) (24), ( 26) and ( 27) explicitly in terms of downgoing and upgoing waves at ∂D, according to…”

Section: Analysis Of the Boundary Integralsmentioning

confidence: 99%

Reciprocity and Representations for Wave Fields in 3D Inhomogeneous Parity-Time Symmetric Materials

Wapenaar¹,

Slob²

2022

Preprint

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Inspired by recent developments in wave propagation and scattering experiments with parity-time (PT) symmetric materials, we discuss reciprocity and representation theorems for 3D inhomogeneous PT-symmetric materials and indicate some applications. We start with a unified matrix-vector wave equation which accounts for acoustic, quantum-mechanical, electromagnetic, elastodynamic, poroelastodynamic, piezoelectric and seismoelectric waves. Based on the symmetry properties of the operator matrix in this equation, we derive unified reciprocity theorems for wave fields in 3D arbitrary inhomogeneous media and 3D inhomogeneous media with PT-symmetry. These theorems form the basis for deriving unified wave field representations and relations between reflection and transmission responses in such media. Among the potential applications are interferometric Green’s matrix retrieval and Marchenko-type Green’s matrix retrieval in PT-symmetric materials.

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“…Elastic immersive wave experimentation 13 respectively 4 . This approach is referred to as elastic immersive wave experimentation, following earlier developments for acoustic and 1D elastic media (Becker et al, 2018;Becker et al, 2020;Börsing et al, 2019;Thomsen et al, 2019). Elastic immersive wave experimentation can overcome many known (and even unknown) challenges in conventional laboratory physical modeling.…”

Section: Elastic Immersive Wave Experimentationmentioning

confidence: 99%

Elastic immersive wave experimentation

Robertsson

Manen

2022

Geophysical Journal International

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We describe an elastic wave propagation laboratory that enables a solid object to be artificially immersed within an extended (numerical) environment such that a physical wave propagation experiment carried out in the solid drives the propagation in the extended (numerical) environment and vice-versa. The underlying method of elastic immersive wave experimentation for such a laboratory involves deploying arrays of active multi-component sources at the traction-free surface of the solid (e.g., a cube of granitic rock). These sources are used to accomplish two tasks: (1) cancel outgoing waves, and (2) emit ingoing waves representing the first-order interactions between the physical and extended domains, computed using, e.g., a finite-difference (FD) method. Higher-order interactions can be built by alternately carrying out the processes for canceling the outgoing waves and the FD simulations for generating the ingoing waves. We validate the proposed iterative scheme for realizing elastic immersive wave experimentation using two-dimensional (2D) synthetic wave experiments.

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Real-Time Immersion of Physical Experiments in Virtual Wave-Physics Domains

Cited by 11 publications

References 37 publications

Broadband acoustic invisibility and illusions

Broadband acoustic invisibility and illusions

Reciprocity and Representations for Wave Fields in 3D Inhomogeneous Parity-Time Symmetric Materials

Elastic immersive wave experimentation

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