Acoustic structural analysis- output interpretation

[S1mul4t0r101]

Hello
I performed acoustic-structural analysis in ABAQUS/Standard and received Output POR and Displacement. I know that the POR valuse gives me the fluid pressure but is it the absolute pressure or gauge pressure? I am having trouble interpreting my results since the POR mmagnitude I got were in the range of 10^12.
I am attaching the Pressure vs. Frequency graph here as reference. Please help.

 

[FEA way]

It’s a gauge pressure. Double-check all the units.

 

[S1mul4t0r101]

I used all units in SI.

 

[S1mul4t0r101]

If it is gauge pressure then are these values feasible? These are a result of steady state dynamics(Modal) operation.

 

[FEA way]

If you use SI(m) units, POR will be in Pa. There's a formula that can be used to convert it to sound pressure level (SPL) in dB. Generally speaking, you should be able to estimate the order of magnitude of the expected acoustic pressure. Especially with such a simple geometry. Unless the definition of your problem is more complicated.

 

[S1mul4t0r101]

Around 350 dB is what it translates to. And my sphere has a radius of 1m. But I still think that it is too high. Its louder than Jet engines (140 dB at 100ft). What could have possibly have gone wrong here?