With this routine you can roughly determine the sound insulation factor for a construction.
A classical construction consists of a mass layer (e.g. masonry), an intermediate layer (absorber) and a facing shell.
Dialog box Roughly calculated sound insulation value for a construction
db_ath_rw
In the dialog box you can enter a comment or a title for the computation in the input line at the top. This title can be saved in various languages. Select the required language from the list and enter the text in the chosen language.
Dialog box section Building element components
db_ath_rw_bauteilaufbau
In the table the selected layers of the component are shown with the appropriate parameters and results as well as the sums of the parameters. The values from left to right: Component thickness d [m]; density ρ [kg/m3]; area-related mass m’ [kg/m2]. Under the table the sums of the mass layer or of the facing shell are displayed.
Dialog box section Edit
db_ath_rw_bearbeiten
Here you have the possibility of modifying the component thickness and density of the selected component. With the Edit button you transfer the details of the component, which is marked in the table Building element components, to the input line. You can change the name of the component, the thickness and the density in the input line. With the Insert button the details from the input line are transferred into the table Building element components. The details are always inserted above the marked line. With the Replace button the details of the component marked in the table are overwritten. If you press the button Remove, the marked component is deleted from the table. With the Save button the details in the input line are saved in the user section of the catalog. You therefore have the possibility of extending the catalog with your own (new or modified) data.
In the section Intermediate layer (absorber)... you define the dynamic stiffness S’ [MN/m3]. Click the button Insert to insert the intermediate layer above the marked layer. Important: All layers above the intermediate layer are treated as mass layers and all layers below the intermediate layer are treated as facing shells.
The following construction (from top to bottom) should be maintained:
1. Mass layer (many components possible)
2. Intermediate layer (only required with double-shell construction).
3. Facing shell (only required with double-shell construction, many components possible).
Dialog box section Catalog
db_ath_rw_katalog
Here all the parameters are shown in a tree structure. They can be selected here and used for the calculation. The navigation to the desired material group can take place with the mouse or keyboard. Closed branches (material groups) in the tree structure are identified with +. Open branches are identified with -.
With the button Adopt, your transfer the parameter from the catalog into the input line of the Edit section. When you click the button Edit ..., the sub-dialog box User catalog is opened for editing. You will find information on the user catalog in the Chapter User catalog.
Dialog box section Mass layer, intermediate layer and facing shell
In these sections the intermediate results for the layers are displayed. The values are:
• Component thickness d [m]
• Sound insulation factor Rw [dB]
• Area-related mass m’ [kg/m2]
• Dynamic stiffness s’ [MN/m3]
Dialog box section Construction
In this region the result of the construction is displayed. The values are:
• Resonant frequency f0 [Hz]
• Sound insulation factor Delta Rw [dB]
• Sound insulation factor Rw tot [dB]
Dialog box section Output
When the option Insert text is activated, a results text is inserted into the drawing on clicking OK. An input request in the command line follows. You can define the text height for the table in the field Text height. With the button Default the default text height (current height of dimension figures) is set. With the pick lists Text style header and Table you define the text style for the corresponding table elements.
When you terminate the dialog box with OK, a results table is inserted into the drawing. Then follows the input request:
Input request
Specify insertion point or [?]:
Specify the insertion point of the results table.
With the option ? you call the help.
Specify rotation angle or [?] <0>
Determine the rotation angle of the results table.
Press the Enter key to accept the default rotation angle.
Note
• You can recompute the results table with the command Modify object. When you click the table, the dialog box with the default values from the selected table appears. The table is updated after terminating the dialog box with OK.
• The texts in the results table are saved in multiple languages. You can display the text in another language with the command Set text language.
• For this routine the same material catalog is used as for the routine Thermal resistance. With the command User catalog you can save user-specific materials in a catalog.
Note: This function for the calculation of building physics values is an aid for the user. CAD-PLAN GmbH can in no way be held liable for the results and any errors and losses arising from it.
