I know this is part of acoustic consultant scope but just curious on how to calculate pressure amplitude. Basically from what I read it's proportional to speed of sound, rpm of recip, density and amplitude...The three former variable can be easily found but the amplitude is a function of Intensity (power/area) basically an energy form. Just curious how to get this intensity and how does it vary.

Experts in acoustic simulations please advise.

Many Thanks in Advance...