FEM and air resistance during harmonic study

[master_clown]

The question is rather theoretical, since I implement the numerical method myself.

I perform harmonic studies of loudspeakers (structural mechanics), and now I'm wondering,
is there a way to consider air resistance without getting dynamics or fluent mechanics
involved? Doesn't really matter that the body is loudspeaker, the question concerns mostly
the method of harmonic study itself.

I'd be really grateful for a theoretical source or something. However, after searching myself
I'm under impression such thing has never been used or considered, but probably I didn't search
properly.

 

[FEA way]

If you don’t want to model the air itself and perform FSI study then you can account for air resistance by introducing proper damping coefficient to the system.

 

[3DDave]

Air is essentially a low rate, low density elastic material with low damping that conducts energy away from the loudspeaker. Energy put into air is eventually lost in materials in the environment or decreased due to spreading out. In loudspeakers where the rear of the speaker is sealed off there is a notable spring effect that affects the dynamics. It's not got significant flow characteristics, but it is dynamic, as is the speaker cone surface.