Temat: 43.55.Ka - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Acoustic Simulation and Experimental Studies of Theatres and Concert Halls
Autorzy:: Kamisiński, T.
Powiązania:: https://bibliotekanauki.pl/articles/1537463.pdf
Data publikacji:: 2010-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.55.Ka
43.55.Mc
43.55.Br
Opis:: Paper presents a numerical simulation of the acoustics of selected concert halls performed using CATT-acoustic software, and the results of acoustic measurements performed in these spaces.
Źródło:: Acta Physica Polonica A; 2010, 118, 1; 78-82
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 2.

Tytuł:: Sound Energy Field in a System of Coupled Rooms
Autorzy:: Meissner, M.
Powiązania:: https://bibliotekanauki.pl/articles/1196695.pdf
Data publikacji:: 2014-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.55.Br
43.55.Ka
43.20.Ks
Opis:: The paper presents a theoretical basis of calculations of the sound intensity in enclosed spaces and shows results of numerical visualization of the active intensity in a room with absorptive walls formed by two coupled rectangular subrooms. The study was focused on the low-frequency range, therefore to describe the active and reactive intensities, the modal theory of room acoustics was applied. Space distribution of eigenfunctions, modal frequencies and modal damping coefficients were calculated numerically using the forced oscillator method (FOM) and the finite difference time-domain (FDTD) method. Based on theoretical and numerical results, the computer program has been developed to simulate the active intensity vector field when the room is excited by a harmonic point source. Calculation data have shown that the active intensity was extremely sensitive to position of the source since at a fixed source frequency, different source locations always generate different distributions of characteristic objects of the active sound field such as energy vortices and stagnation points. Because of complex room shape, the vortex centers are in most cases positioned irregularly inside the room. Almost regular arrangement of vortices was found only in the case when the source frequency was tuned to the frequencies of modes which were strongly localized in one of the subrooms.
Źródło:: Acta Physica Polonica A; 2014, 125, 4A; A-103-A-107
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 3.

Tytuł:: Simulation of Acoustical Properties of Coupled Rooms Using Numerical Technique Based on Modal Expansion
Autorzy:: Meissner, M.
Powiązania:: https://bibliotekanauki.pl/articles/1537509.pdf
Data publikacji:: 2010-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.55.Br
43.55.Ka
43.20.Ks
Opis:: In the present study, the acoustic characteristics of coupled rooms were investigated using the computer modelling application based on the modal expansion method. A numerical procedure enables the computation of shape and frequency of eigenmodes, and allows one to predict sound decay times at any point of a room space. Results of numerical simulation have shown that along with a change in a coupling area the effect of a mode degeneration appeared and there are two main reasons for this. First, a mode degeneration is associated with a convergence of frequencies of neighbouring modes with a decrease of coupling area. Another reason for the mode degeneration are variations in a sequence of modes with a change in the coupling area. It was demonstrated that in the coupled rooms several modes exhibit a considerable localization. A degree of mode localization was described theoretically by the "existence surface" of mode and it was found that the localization phenomenon has a great effect on the reverberation process because for some absorbing material distributions it caused the double-slope decay characterized by steep initial and slow late sound decays.
Źródło:: Acta Physica Polonica A; 2010, 118, 1; 123-127
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 4.

Tytuł:: Numerical Modelling of Coupled Rooms: Evaluation of Decay Times via Method Employing Hilbert Transform
Autorzy:: Meissner, M.
Powiązania:: https://bibliotekanauki.pl/articles/1504422.pdf
Data publikacji:: 2011-06
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.55.Br
43.55.Ka
43.20.Ks
43.60.Ac
Opis:: In the paper, a usefulness of the Hilbert transform in a computer modelling of reverberant behaviour of rooms is demonstrated for the enclosure consisting of two coupled subrooms. In numerical simulations a decay of the sound pressure is computed and the Hilbert transform methodology is used to determine an envelope of this decay. Calculation results have shown that, because of the mode localization, a distribution of absorbing material has a great influence on decay times evaluated from changes in the pressure envelope. For example, when a difference between the sound damping in subrooms is large, the localization effect is responsible for a creation of a nonlinear decay of the sound pressure level characterized by rapid early and slow late sound decays.
Źródło:: Acta Physica Polonica A; 2011, 119, 6A; 1031-1034
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Informacja

Wyszukujesz frazę "43.55.Ka" wg kryterium: Temat

Źródło danych

Dostawca treści

Kolekcja

Rok wydania

Wydawca

Temat

Autor

Typ dokumentu

Język