Measurement and modeling of diffraction from an edge of a thin panel

Lokki, Tapio; Pulkki, Ville; Calamia, Paul

doi:10.1016/j.apacoust.2007.05.005

Cited by 8 publications

(2 citation statements)

References 19 publications

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“…This sound field, beyond the direct and distinct specular reflection paths [32,36,42], consists also of diffracted sounds from those paths, generated sequentially from the edges of the tiers along the slope of the seating rows ("cavea" or "koilon") [22,24,33]. As is known [43][44][45][46][47][48][49], the propagation of edge diffracted waves strongly depends on the geometry of the field, the relative angles of the propagated path, the shape of the edge of the rigid object and the receiver position. It appears that the geometrical design principles for the slope and dimensions of the tiers for the Epidaurus theatre, especially due to the choice for double slope for the extended upper koilon, contribute to the optimal harvesting of such edge diffraction effects, increasingly so for the most distant listeners [33,50].…”

Section: Introductionmentioning

confidence: 99%

Time-frequency diffraction acoustic modeling of the Epidaurus ancient theatre

Kaleris,

Moiragias,

Hatziantoniou

et al. 2023

Acta Acust.

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This work provides an in-depth investigation on the effect of sound diffraction in the acoustics of the ancient theatres, with reference to the theatre of Epidaurus. It is increasingly evident that in such theaters, sound diffraction at the edges of the multiple tiers generates significant source signal amplification. Especially for the distant listener positions, an accumulation (“avalanche”) effect from lower tier diffracted energy is identified. This study examines a 3D model of an elementary slice of the seating benches (“koilon”), evaluating the generated sound field in the time, frequency, and spatial domains. The analysis accounts for direct, reflected, diffracted and mixed reflected – diffracted paths and the theatre’s acoustic response is numerically evaluated in various positions along the koilon slice, accurately matching to in-situ measurements. The contribution of the diffracted sound to the total sound field is identified through a detailed and novel analysis of energy-based acoustic parameters, via the time and frequency responses as well as of the spatial parameters relating to listener-perceived effects. In all cases, the contribution of sound diffraction components is examined via its contribution to speech intelligibility from signals generated in the theatre’s orchestra and from a virtual reconstruction of the stage-scenic building.

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Section: Introductionmentioning

confidence: 99%

Time-frequency diffraction acoustic modeling of the Epidaurus ancient theatre

Kaleris,

Moiragias,

Hatziantoniou

et al. 2023

Acta Acust.

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“…The derived analytical directivity functions yield the exact solution for an infinite wedge. Furthermore, comparison of measurements results from an edge of a thin chipboard panel performed by Lokki et al (Lokki et al, 2008) with theoretical simulations based on the model developed by Svensson et al (Svensson, 1999) showed that the theoretical model can make accurate predictions of the diffracted sound field.…”

Section: Time Domain Diffraction Modellingmentioning

confidence: 94%

Acoustic characterization of open cavities with the image source model

Montaño¹

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Primero que todo quiero agradecer de corazón a mis padres María del Socorro y Cesar Alfonso por el amor incondicional y el apoyo que siempre me han brindado. Les estoy eternamente agradecido y cada día doy gracias a la vida por tenerlos. Igualmente a mi hermana Martha y a mi hermano Jose a quienes quiero y admiro profundamente.En segundo lugar quisiera agradecer a mi director de Tesis Dr. Pedro Cobo Parra por la confianza y la paciencia depositada en mi y por abrirme las puertas de su conocimiento generosa y amablemente para así poder construir ¨sobre hombros de gigantes¨.Gracias por enseñarme a llevar a cabo el trabajo con rigor científico y con resultados claros, por darme la oportunidad y por levantarme en los momentos difíciles.Por último pero sin duda una parte fundamental en el camino de esta tesis, quiero agradecer a toda la gente maravillosa con la que compartí experiencias inolvidables; a mis compañeros de despacho Heidi, David y Cristóbal que ahora considero buenos amigos, al inigualable Shiva, a Jaime Rodríguez, a Pedrito Castro y Carlitos Sierra , a la hermosa Carmen, a Toñi , a Paco Montero, a todos los del fútbol y a los compañeros del máster. Fue una época maravillosa y nunca los olvidaré.

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