When solving a model in the frequency domain, you need to specify the Frequencies to solve for in the
Frequency Domain study step. Several built-in options exist when selecting the
Range (
). Specifically for acoustics modeling the
Entry method has the
Logarithmic and the
ISO preferred frequencies. The latter option is only available with the Acoustics Module and is activated by clicking the
Show More Options button (
) and selecting
Advanced Physics Options in the
Show More Options dialog box. For
ISO preferred frequencies, select a start and stop frequency and the interval (Octave, 1/3 Octave, 1/6 Octave, 1/12 Octave, and 1/24 Octave). The 1/3 octave preferred frequencies are defined based on ISO 266. They are extended to frequencies based on the preferred numbers of ISO 3 (series R20, R40, and R80).