Optimizable Source Tab

Note

This tab is only available when having the option BPL installed.

On tab „Opt.Src.“ three different options referring to the propagation conditions applied in conjunction with optimizable sources (see Optimisable Source) can be specified.

like Industry Sources

With this option, the calculation of propagation of optimizable sources apply the selected industry standard or guideline (see dialog Calculation|Configuration, „Standards“ tab, see Standards).

Free field (4pir²)

With this option, the propagation just considers geometrical divergence in a free-field using: SPL = PWL - 11 dB - 20 lg rIn this case, there are no other damping effects, like air absorption and diffraction, considered.

Free field (2pir²)

With this option, the propagation just considers geometrical divergence in a semi-free-field using: SPL = PWL - 8 dB - 20 lg rAgain, there are no other damping effects considered.
- option „r is horizontal (2D) distance“: With this option activated the 2D-distance as projected to the xy plane is used to calculate the geometrical divergence. This setting complies with the requirement of DIN 45691 45691-2006.

Mixed parameters in conjunction with option BPL

Please note that the optimization of sound power levels per m² using the option BPL can be carried out only for the daytime level Ld and the night-time level Ln (list box „Day/Night“ on the dialog Optimizable Source). In particular, the optimization of mixed evaluation parameters (like Lde or Lden) is excluded - for the time being.

Editing Iteration Increment

By default, the iteration increment applied with optimizable sources sources is 0.1 dB.

In order to optimize for the calculation runtime, particular at a large number of BPL sources, the iteration increment can be set using a local text block (see Text Blocks, named BPL).

Example

Name: BPL

Text: DELTA_L = 1.0

In this case, an iteration increment of 1.0 dB will be used when optimizing BPL sources.