WinFlag 2.3 Material Acoustic Performance Estimation Software

WinFLAG
Acoustic Performance Estimation Software

Do you need to estimate the acoustic performance of constructions combining different material layers such as porous materials (e.g. mineral wool), solid and perforated plates (slotted, with circular holes, microperforated)?

Download and evaluate WinFlag 15 days for free from here. From the same link you may also download and evaluate our low price alternative WinFlag ver. 1.0. For pricing and for purchasing WinFLAG, click here. If you have questions about WinFlag, please use the WinFlag/WinRT60 forum.
We also recommend looking at our solutions WinMLS and WinRT60.

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User Reviews

�These programs (WinFlag and WinRT60) are exceptionally user-friendly and will be useful tools in any acoustic engineer�s toolbox�

- Carl Hopkins, University of Liverpool, UK

"Personally, I think it is a great program!"
- Walter Lauriks, KU-Leuven, Belgium

�I have to say I love this program. It is a matter of seconds to design an absorber panel for a specific frequency, and adjust its Q. Compared to similar software it is more straightforward, quicker, and looks overall more professional.�
- Thalis Menexelis, Athen, Greece

"The manual and program looks very intuitive and good with references for the models. I think this program is a useful tool for acoustics consultants and even producers of absorbers."
- Anders Buen, Brekke & Strand Akustikk AS, Norway

WinFLAG Overview

WinFLAG does the job of calculating the absorption coefficient, the impedance and the sound reduction index for constructions combining different material layers such as porous materials (e.g. mineral wool), solid and perforated plates (slotted, with circular holes, microperforated). WinFLAG version 2.3 also calculates the attenuation of noise in ducts, e.g. air-conditioning ducts, lined with the chosen layers.

Calculations may be performed at single frequencies or as mean values in one-third-octave bands, for free and diffuse field sound incidence. For exported data (MS-Excel or ASCII) values in octave-bands are presented. One may estimate the absorption coefficient measured in a standard reverberation room according to ISO 354. These absorption coefficients may be directly exported to the program WinRT60 that calculates the reverberation time in rooms.

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For its calculations, WinFLAG uses a transfer matrix method with two physical variables: sound pressure and particle velocity. This implies that porous materials are treated as equivalent fluids, which will not completely represent certain 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. For details please see the WinFLAG manual.

� Calculates the absorption coefficient for 17 different types of layers, including 4 different models of porous materials. The absorption coefficient may be calculated, with some exceptions, for any combination or any number of these layers limited to a total of 20 layers. An 18^th type of layer, the infinitely hard wall, i.e. a rigid backing, may be included in the case of absorbers placed against a hard wall in a room.

� Absorption coefficients obtained in a standard reverberation room (the commonly used product data after ISO 354) may be estimated, as well as the weighted sound absorption coefficient a_W according to ISO 11654.

� The sound reduction index in dB (sound transmission loss) is simultaneously calculated for all combinations not including the infinitely hard wall. The weighted sound reduction index R_w according to ISO 717 Part 1 is also calculated when applying a diffuse field option and calculating results in one-third-octave band.

� To simulate structural connections in double lightweight walls, such as studs or point-like connections (�ties�), a 19^th type of layer named Structural bridges, is introduced.

� The acoustic impedance is also simultaneously calculated in all cases when an angle of sound incidence is specified.

� All 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 one-third-octave bands. There is also an option for exporting calculated results as mean values in octave bands.

� As an add-on to the program the attenuation of noise in ducts, e.g. air-conditioning ducts, lined with the chosen layer configuration may be calculated.

� A report window in Rich Text Format (.rtf file) is implemented where specifications, tables of results and diagrams may easily be imported.

� Results, together with specifications for the combination of layers, may be exported to a plain text file (ASCII), alternatively to a Microsoft Excel file.

� A chosen combination of layers, a configuration, may be saved to a file and later imported for additional calculations. The same applies to single layers, which enables the user to build up a library of material layers.

New features in WinFLAG version 2.3 (upgrade from version 2.2)

Version 2.3 introduces the following two features to improve on the prediction of sound transmission:

� A spatial windowing technique is introduced, where a finite sample size is simulated when calculating sound transmission. This makes the results, especially in the low frequency range and for smaller specimens as e.g. windows, more in accordance with the measured data. The sample size is specified under a new menu item �Sample size�.

� For certain double wall constructions, a coupling layer simulating structural line-like (studs) or point-like rigid connections between the outer layers (plates) is introduced. In practice, there will always be some structural connections in double wall constructions, as least along the boundaries. Including the coupling layer removes the unrealistic high transmission data values normally seen when calculating multiple plate constructions.