Calculation - Basic

WARNING

» ALWAYS make complete models, with d-f1-f2-f3-f4 junctions and constructions selected for the worksheet.
» ALWAYS check there is an "OK" at the bottom right corner, which means BASTIAN confirms the model is OK.

How to find or change data on elements easily? There are many structures in the database, in particular light weight walls…and still we do not always find what we need in the individual case

Answer
1. BASTIAN displays thumbnail pictures of many constructions, use these rather than browsing all database lines. Or, turn on the diagram display button and look at the sound insulation values, weighted or by 1/3 octaves, to find a construction. Or, choose country selector S for Swedish only, or NT for all Nordic entries.

2. Mark your favourites by making copies: In the Database menu, select your standard choices and make copies of them (right-click, NewAsCopy). Add 3 blank spaces to make them appear at the top. BUT remember to update these copies in case there are changes made to the original data, as announced with update patches from the administrator.

3. The same procedure holds for changes of data, make a copy, rename it and change the data according to your concept

How to import field measured data to the BASTIAN database?

Answer
1. If you are certain that your measured data reflect the performance of one single element only, go to the Database menu and open the most relevant category. In the table, right-click and choose NewConstruction. Paste the data and add descriptions of the construction.

2. Be aware of the limitations of field data, i.e. they comprise flanking transmission of connected structures as well as structural loss factors that deviate from laboratory conditions (assumed in BASTIAN). Read reports available under the Böcker & Artiklar tab at the top. Or contact us for assistance.

I chose the performance parameters R’w+C50-5000 and L’n,w+Ci,50-2500. Then I am trying to select constructions from the CONSTRUCTION CHOOSER dialog box. But, there are no constructions available. Why?

I try to choose R'w (+ ----) and LnT,w+Ci50-2500 in the Extra/Preferences/PerformanceParameters pane, but am not allowed to. Why?

Answer
When the spectrum adaption term or terms are selected, BASTIAN searches for constructions with data covering the frequency range as specified in the PREFERENCES dialog box. In case of measured data it may be that there are no data down to 50 Hz available. You may create a copy of a construction and extend the frequency range down to 50 Hz manually (using YOUR experience). A safer way is to ASK US to calculate input data for specific constructions or talk to the manufacturer about updates.

Furthermore, if impact sound transmission is selected only those constructions will be displayed which have impact data available, ranging down to 50 Hz (see manual). TURN OFF the hammer icon if only airborne sound data are entered, e.g. for small elements e.g. air inlets. This holds for additional layers as well. The other way around is also true, you could insert dummy airborne insulation values (zeros) to avoid having a blank list in the database chooser!

I have two doors inside the flanking elements. How can I include these doors in the model?

Answer
A) Doors as sound transmitting elements are only considered in case they are situated inside the separating element. Doors or windows inside flanking elements reduce the excited (sending side) or radiating area (recieving side) of the flanking element. This can be considered through the dialog box GEOMETRY DATA (Extras menu). Note, from then, all geometry data are entered manually.

B) If the intention is to consider flanking transmission by leakage or direct sound transmission, e.g. via a door-corridor-door path, calculate separately the assembled flanking transmission. Add this value as a fictive flanking element (system) to the database and select it in the calculation table.

When inserting a door into the separating element the weighted sound reduction index in the CONSTRUCTION CHOOSER dialog box differs from the value displayed in the table of the worksheet. Why?

Answer
The value displayed in the table of the worksheet is the sound reduction index referring to the total (gross) area of the separating element. E.g. for a door of S=1,5 m2 inside a separating element with the total area Stot=15m2 the figure displayed in the table is 10*lg(1,5/15)=10 dB larger than the weighted sound reduction index Rw of the door.
WARNING: In version 2.3.98, this calculation is erroneous, it refers to the net area. To be corrected in an update.

After having selected the separating element and subsequently the flanking elements the sound reduction for the separating element is changing after each selection. Why?

Answer
As default-configuration the sorting of the flanking paths is set to "Recieving side". This means, that as far as the separating element is concerned, all flanking paths Fd are added to the separating path Dd. This causes the sound reduction index via the separating element to change with each selection of a flanking element. If you select the sorting by junction (Menu Worksheet Sorting) all flanking paths will be added up below the corresponding flanking element leaving the path Dd for the separating element only (see manual). WARNING: Always make complete models, you should see OK at bottom/right corn.

The column widths change in the worksheet when I duplicate or minimize/restore the worksheet. How can I fit the widths to the open worksheet size?

Answer
A) Hold down the shift key and double click on one of the vertical borders of the table grid. The size of the column widths adapt to the open worksheet. Doubleclick only fits the columns to display all information which typically returns a too wide table to fit the window. Some data entries are long, which makes the worksheet too wide to be practical. Use SHIFT+d-click instead.

B) Hopefully, this function will be automated in future versions, we still ask for this.

Where do I find the manual of BASTIAN?

Answer
A) Note that the manual is located in a separate folder on the BASTIAN CD.
Please copy this to all local drives where BASTIAN is installed, and make a shortcut on the desktop or in the START menu.

B) NB! Replace old manuals (PDF-files) when the current version is installed.

How do I calculate with own source room spectra in BASTIAN?

Answer
A) Make sure you have DnTw in the worktable header. If not; change preferences under Extra menu and duplicate the worksheet. Then activate the SubTable in the View menu. You now see the work Source and 3 dots (...) in the bottom line of the worktable. Double-click the dots and choose from the list of available spectra. BASTIAN calculated the A-weighted level in the source room and in the receiver room. If you need to adapt the level, do so under Database menu first, then choose the new spectra in the worktable. If the L1-L2 difference is much larger than anticipated by the DnTw+C value, the spectra of the real source puts less efforts on the partition than assessed by the C-spectrum.

B) NB! Sound level refers to diffuse sound level. For outdoor-indoor the level 2 m in front of facade, i.e. the +3 dB position.