SpectraSim Documentation
Parameter · 07 Run Settings

Receivers (microphones)

acoustics.extra_results.receivers_enabled Step 07 · Run Settings

The sound pressure at chosen points inside the model at every swept frequency, computed during the sweep: SPL, magnitude and phase spectra for comparison with a microphone measurement.

Last updated

Theory

Each receiver has a name and x, y, z in mm. During the sweep the pressure of the run's own excitation is interpolated at the point with the P2 shape functions of the tetrahedron that contains it. The method and its check are in Additional acoustic results: receivers, section power, dissipation, flow effect.

Equations

pr=∑a=110Na(ξr) pa,SPL=20log⁡10∣pr∣2 prefp_r = \sum_{a=1}^{10} N_a(\xi_r)\, p_a, \qquad SPL = 20 \log_{10} \frac{|p_r|}{\sqrt{2}\, p_{ref}}
(1)
wheremeaningunit
prp_rPressure amplitude at the receiverPa
NaN_aP2 shape functions-
prefp_{ref}20 µPaPa

Default and rule

Default
off
Rule

Off.

Valid range on | off

Cost

Under 1 % of the sweep.

Inside the model

A point outside the acoustic model gives no value; the log lists it.