A new method for analysis of the modal characteristics of small rectangular rooms

• Autorzy: Błaszak, M.A.
• Języki publikacji: EN

Abstrakty

EN

The main aim of the study was to compare acoustic comfort in eighteen rectangular classrooms, using a new method for modal analysis. Taking into regard the Schroeder frequency as the upper frequency limit, a statistical fluctuation in frequency spacing was calculated for all modes (parameters A and B) and axial modes separately (parameters C and D). Considering the range extended by about 30% towards higher frequencies, when compared to Bolt assumptions, it appeared that the rooms did not satisfy the Bolt criterion changed significantly their modal regularity. The enclosure with the ideal proportions, according to R.H. Bolt (1 : 1.5 : 2.5) had the A value higher than a few rooms of other proportions and hence, was characterized by greater statistical fluctuation in frequency spacing.

Słowa kluczowe

EN

classrooms; eigenmodes

• Czasopismo: Archives of Acoustics
• Rocznik: 2006
• Tom: Vol. 31, No. 4
• Strony: 461-469
• Opis fizyczny: Bibliogr. 6 poz.

Twórcy

autor

Błaszak, M.A.

• Adam Mickiewicz University, Institute of Acoustics, Umultowska 85, 60-614 Poznań, Poland,

Bibliografia

• [1] BERG F. S., Acoustic and sound systems in schools, Singular Publishing Group, 1993.
• [2] BŁASZAK M. A., Czynniki determinujące komfort akustyczny w budynkach szkolnych, M.Sc. Thesis, Adam Mickiewicz University, Faculty of Physics, Institute of Acoustics, Pozna ´n 2005.
• [3] BOLT R. H., Note on normal frequency statistics for rectangular rooms, J. Acoust. Soc. Am., 18, 130.133 (1946).
• [4] KNUDSEN V. O., Resonance in small rooms, J. Acoust. Soc. Am., 4, 20.37 (1932).
• [5] RoomModeCalculator013.xls, author: Eric Desart.
• [6] SCHROEDER M. R., On frequency response curves in rooms, comparison of experimental, theoretical, and Monte Carlo results for the average frequency spacing between maxima, J. Acoust. Soc. Am., 34, 76.80 (1962).