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Wyszukujesz frazę "tonal structure" wg kryterium: Temat


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Tytuł:
ABOUT THE FOUR SONGS OMITTED FROM THE REVISED DICHTERLIEBE
Autorzy:
Bodnár, Gábor
Powiązania:
https://bibliotekanauki.pl/articles/566562.pdf
Data publikacji:
2019-01-23
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
Schumann’s song cycles
Liederjahr
collection of poems
selection as compositional work
“emotional song groups”
tonal structure
Opis:
At the end of May 1840 Robert Schumann composed 20 songs from Heine’s Lyrisches Intermezzo under the title 20 Lieder und Gesänge aus dem Lyrischen Intermezzo. The series was published in 1844, containing only 16 songs and was entitled as Dichterliebe. The four omitted songs were also published later on – but what was the reason for omitting them? We can perhaps never come to know that, though we are able to find possible answers, revising the cycle of the poems and the music itself. The “evidences” could be the following: – The selection: reduce the 1+ 65 poems to 20 (and at last 16) songs. – The attenuation of the “death atmosphere”. – The concentration of the “dream poems” to the end of the cycle. – The diminution of the power of “chivalric love”. – And finally: improving the tonal structure. Schumann could really take into consideration this important structural aspect in the last stage of his work: the well-known Dichterliebe might have been realized in this way.
Źródło:
Ars inter Culturas; 2018, 7; 209-226
2083-1226
Pojawia się w:
Ars inter Culturas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Prediction of the Tonal Airborne Noise for a NACA 0012 Aerofoil at Moderate Reynolds Number Using a Transitional URANS Approach
Autorzy:
De Gennaro, M.
Küehnelt, H.
Zanon, A.
Powiązania:
https://bibliotekanauki.pl/articles/178116.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tonal airborne noise
NACA 0012
Laminar Boundary Layer-Vortex Shedding noise
Ladder-like tonal structure of the acoustic spectrum
multi-tonal structure of the acoustic spectrum
Opis:
Tonal airborne noise of aerofoils appears in a limited range of moderate Reynolds numbers and angles of attack. In these specific conditions, the aerofoil is characterised by a large region of laminar flow over the aerodynamic surface, typically resulting in two-dimensional laminar instabilities in the boundary layer, generating one or more acoustic tones. The numerical simulation of such phenomenon requires, beside an accurate prediction of the unsteady flow field, a proper modelling of the laminar to turbulent transition of the boundary layer, which generally imposes the use of highly CPU demanding approaches such as large eddy simulation (LES) or direct numerical simulation (DNS). This paper aims at presenting the results of numerical experiments for evaluating the capability of capturing the tonal airborne noise by using an advanced, yet low computationally demanding, unsteady Reynolds-averaged Navier-Stokes (URANS) turbulence model augmented with a transitional model to account for the laminar to turbulent transition. This approach, coupled with the Ffowcs Williams and Hawkings (FW-H) acoustic analogy, is adopted for predicting the far-field acoustic sound pressure of a NACA 0012 aerofoil with Reynolds number ranging from 0.39 · 106 to 1.09 · 106. The results show a main tone located approximately at 1.6–1.8 kHz for a Reynolds number equal to 0.62 · 106, increasing to 2.4 kHz at Reynolds number equal to 0.85 · 106 and 3.4 kHz at 1.09 · 106, while no main tones are observed at 0.39 · 106. The computed spectra confirm that the acoustic emission of the aerofoil is dominated by tonal structures and that the frequency of the main tone depends on the Reynolds number consistently with the ladder-like tonal structure suggested by Paterson et al. Moreover, in specific conditions, the acoustic spectra exhibit a multi-tonal structure visible in narrowband spectra, in line with the findings of Arbey and Bataille. The presented results demonstrate the capability of the numerical model of predicting the physics of the tonal airborne noise generation.
Źródło:
Archives of Acoustics; 2017, 42, 4; 653-675
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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