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Wyświetlanie 1-6 z 6
Tytuł:
Exploring the Acoustics of Ancient Open-Air Theatres
Autorzy:
Girón, Sara
Álvarez-Corbacho, Ángel
Zamarreño, Teófilo
Powiązania:
https://bibliotekanauki.pl/articles/177082.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
acoustics of theatres
classical theatre acoustics
open-air theatre
heritage acoustics
Opis:
The theatres of Antiquity, Greek and Roman, constitute public buildings of the utmost importance in the history of Western culture and in universal cultural heritage. Many of these spaces are being used for their original function with or without only minor adaptations. If they are well preserved and/or restored, these performance buildings attract large audiences to representations of classical and contemporary plays, thereby serving the purpose for which they were built in the Ancient Age. These theatres bear witness to the existing relationship between architectural work, visual and acoustic experience, and dramatic art. Although the majority are located in the Mediterranean region, these structures were also built in the major cities of the ancient world in Europe, the Middle East, northern Africa, and beyond. This paper aims to summarise and critically review research published in the literature regarding their acoustic aspects, with particular emphasis on Roman theatres. These pieces of research emphasize the importance of the diffraction of sound in the tiers of the cavea and the good intelligibility for speech of the Greco-Roman theatre.
Źródło:
Archives of Acoustics; 2020, 45, 2; 181-208
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Underwater Noises of Open-Circuit Scuba Diver
Autorzy:
Korenbaum, Vladimir
Kostiv, Anatoly
Gorovoy, Sergey
Dorozhko, Veniamin
Shiryaev, Anton
Powiązania:
https://bibliotekanauki.pl/articles/177264.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
underwater acoustics
diver
respiratory noises
noises of fins
open-circuit scuba
breathing apparatus
detection
monitoring
bearing
Opis:
The features of respiratory noises and noises of fins for open-circuit scuba divers, indicating a multipole character of noises emission, are specified in cameral conditions. It demonstrates a possibility to detect low-frequency components of noises of fins with pressure gradient sensor in near field. A possibility of estimating the respiratory rate of an open-circuit scuba diver is demonstrated at distances up to 100 m in real sea. It gives an opportunity of estimating the bearing (time delay in a pair of hydrophones) for the open-circuit scuba diver by respiratory noises at distances up to 150 m in real sea. Thus, low-frequency underwater noises of open-circuit scuba divers may be successfully applied to monitor the safety of diving and to prevent waterside intrusion by trespassers.
Źródło:
Archives of Acoustics; 2020, 45, 2; 349-357
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Sound Source Regions in Open and Closed Organ Pipes
Autorzy:
Hruška, Viktor
Dlask, Pavel
Powiązania:
https://bibliotekanauki.pl/articles/176660.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
particle image velocimetry
acoustics of music instruments
organ pipes
edge aerophones
Opis:
The airflow in the mouth of an open and closed flue organ pipe of corresponding geometrical proportions is studied. The phase locked particle image velocimetry with subsequent analysis by the biorthogonal decomposition is employed in order to compare the flow mechanisms and related features. The most significant differences lie in the mean velocity distribution and rapidity of the jet lateral motion. Remarks on the pressure estimation from PIV data and its importance for the aeroacoustic source terms are made and a specific example is discussed.
Źródło:
Archives of Acoustics; 2019, 44, 3; 467-474
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revisiting the Open-End Reflection Coefficient and Turbulent Losses in an Organ Pipe with Low Mach Number Flow
Autorzy:
Hruška, Viktor
Dlask, Pavel
Powiązania:
https://bibliotekanauki.pl/articles/1953497.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
organ pipe
reflection coefficient
end correction
flow-acoustic interactions
Opis:
The reflection coefficient of the open end belongs among the essential parameters in the physical description of a flue organ pipe. It leads directly to practical topics such as the pipe scaling. In this article, sound propagation is investigated inside an organ pipe with the most intense mean flow that is achievable under musically relevant conditions. A theoretical model is tested against the experimental data to obtain a suitable formula for the reflection coefficient when a non-negligible flow through the open end is considered. The velocity profile is examined by means of particle image velocimetry. A fully developed turbulent profile is found and interactions of the acoustic boundary layer with the turbulent internal flow are discussed. A higher value of the end correction than expected from the classical result of Levine and Schwinger is found, but this feature shall be associated with the pipe wall thickness rather than the mean flow effects.
Źródło:
Archives of Acoustics; 2021, 46, 2; 197-204
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite Element Modelling of a Flow-Acoustic Coupling in Unbounded Domains
Autorzy:
Łojek, Paweł
Czajka, Ireneusz
Gołaś, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1953539.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
linearised Euler equations
LEE
FEniCS
finite element method
non-reflective boundary
conditions
open source
Opis:
One of the main issues of design process of HVAC systems and ventilation ducts in particular is correct modelling of coupling of the flow field and acoustic field of the air flowing in such systems. Such a coupling can be modelled in many ways, one of them is using linearised Euler equations (LEE). In this paper, the method of solving these equations using finite element method and open source tools is decribed. Equations were transformed into functional and solved using Python language and FEniCS software. The non-reflective boundary condition called buffer layer was also implemented into equations, which allowed modelling of unbounded domains. The issue, influence of flow on wave propagation, could be adressed using LEE equations, as they take non-uniform mean flow into account. The developed tool was verified and results of simulations were compared with analytical solutions, both in one- and two-dimensional cases. The obtained numerical results are very consistent with analytical ones. Furthermore, this paper describes the use of the developed tool for analysing a more complex model. Acoustic wave propagation for the backward-facing step in the presence of flow calculated using Navier-Stokes equations was studied.
Źródło:
Archives of Acoustics; 2020, 45, 4; 633-645
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of Sound Absorbers Based on Open-Cell Foams via Microstructure-Based Modeling
Autorzy:
Trinh, Van-Hai
Nguyen, Thien-Van
Nguyen, Thi-Hai-Nhu
Nguyen, Minh-Tan
Powiązania:
https://bibliotekanauki.pl/articles/31339944.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
monodisperse foam
cellular morphology
transports
sound absorption
equivalent fluid
multiscale simulation
Opis:
Effects of microstructure factors on the acoustic performance of open-cell foams can be characterized numerically by a microstructure-based approach. To this regard, the numerical homogenization approach and the equivalent-fluid theory are employed to study the acoustic behavior of random open-cell foams within their Voronoi tessellation-based Representative Volume Elements (RVE). As a validation step, the numerical predictions are compared with the reference findings to either verify the finite element procedure or demonstrate that the constructed RVE can capture both the local geometrical characteristics and the acoustic macrobehavior of cellular solid foams. It can be seen from the obtained results that the morphological characteristics of open-cell foams could be controlled to achieve the desired sound absorbing behavior. In addition, the analytical expressions, formulating the relationship between the geometry of foam absorbers and their target absorption performance, are established to design sound absorbing foam layers.
Źródło:
Archives of Acoustics; 2022, 47, 4; 501-512
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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