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WinFLAG 1.0 Overview
Do you need to estimate the acoustic performance of constructions combining different material layers such as porous materials (e.g. mineral wool), perforated plates (slotted, with circular holes, microperforated) etc.? WinFLAG does the job calculating absorption coefficient, impedance and sound reduction index for such constructions.
Calculations may be performed at single frequencies or as mean values in 1/3 octave bands, in both cases for a free field sound incidence as well as in a diffuse field. In addition, one may for the absorption coefficient estimate the results measured in a standard reverberation room test according to ISO 354.
The program is implemented using a transfer matrix method, however, only two physical variables are used (sound pressure and particle velocity). This implies that porous materials are treated as equivalent fluids which not fully will represent foam materials. The program will, however, give a proper model in a vast number of cases and certainly be useful both for acoustic consultants and for students in acoustics as well.
WinFLAG 1.0 Features
Calculates the absorption coefficient for 10 different types of layers including 4 different models of porous materials. The absorption coefficient may be calculated for any combination or any number of these layers limited to a total of 20 layers. An 11th type of layer, the infinitely hard wall, may be included in the case of absorbers placed against a hard wall in a room.
Absorption coefficients obtained in a standard reverberation room test (the commonly used product data after ISO 354) may be estimated.
The sound reduction index in dB (sound transmission loss) is simultaneously calculated for all combinations not including the infinitely hard wall.
The acoustic impedance is also simultaneously calculated in all cases when an angle of sound incidence is specified.
All the data mentioned above may be calculated for a given angle of incidence or in a diffuse field.
Calculations are performed at single frequencies or as mean values in 1/3 octave bands.