WinFLAG
Acoustic Performance Estimation Software

Note: WinFlag has been updated, this page is retired, please go to www.winflag.com.

Evaluate for free for 30 days from here WinFLAG ver. 1 or WinFLAG ver. 2. WinFLAG ver. 2 has more features but a higher price. For pricing or for purchasing WinFLAG, click here. If you have a question about WinFlag, please post it on the WinFlag forum.

WinFLAG Overview

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 will not fully 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 Features (version 1.0)

• 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 11^th 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 (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 one-third-octave bands.

For details please see the manual for WinFLAG 1.0.

New Features in WinFLAG version 2.0
There are a number of new features and important changes compared to version 1.0. Two new types of layers have been added. These are:

• Thick plate (elastic)
• Sandwich

The sound reduction index of thick walls and of symmetrical sandwich elements may now be calculated, which means that also the effect of thickness deformations, i.e. dilatational modes, is taken into account. Furthermore, changes have been made for two types of layers, notably:

• For the microperforated layer the mass impedance is now included. This is due to the use of thin microperforated plastic foils where the mass will be of much greater importance than for microperforated metal plates.

• A power attenuation coefficient is added to the specifications of the air layer.

Important new features:

• 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 added where specifications, tables of results and diagrams may easily be imported.

• In addition to the saving of a chosen layer configuration, a single layer may be saved to a file and later imported via the “Add layer” menu. This will enable the user to build up a library of material layers.

• Results may be exported, in addition to a plain text file (ASCII), to a Microsoft Excel™ file.

• The weighted sound absorption coefficient a_W according to ISO 11654 is estimated. This applies when using the menu item “Reverberation room” and when the option one-third-octave band is selected.

• The weighted sound reduction index R_w according to ISO 717 Part 1 is calculated. This applies when using the menu item “Diffuse” and when the option one-third-octave band is selected.

For details please see the manual for WinFLAG 2.0.