Conference_programme: 18.8 - Recent trends in numerical modeling: protocols and reliability
Lecture: Reverberation Time (RT) Calculation Based on Room Modal Decay and Using Wave Based Geometrical Acoustics (WBGA) and Modal Parameter Estimation
Author(s): Economou Panos, Economou Costas
Summary:
In a previous paper, by the same authors, it was demonstrated that RT cannot be expressed as a continuous process in any domain; frequency, spatial or time. This paper is a continuation of the previous treatise, with the room being considered as a multi-resonant system. Its free vibrations, which aurally relate to reverberation, can be determined by the standard approach of the modal decay constant found in all linear systems irrespective of discipline. While in the previous paper, the methodology of implementing room modal RT was described for a cuboid room based on analytical expressions, this paper applies the same methodology for rooms of arbitrary shapes. With the use of Wave Based Geometrical Acoustics (WBGA) the transfer function (TF) of rooms of arbitrary shape is calculated. However, since resonances couple and overlap each other, the exact positions of modal frequencies become less evident. For this purpose, techniques of Vibration Modal Parameter Estimations used in Experimental Modal Analysis are applied here to detect resonant frequencies and their modal damping.
Corresponding author
Name: Mr Panos Economou
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Country: Cyprus
