Vibroacoustic simulation of a diaphragm backed by an air cavity.
I am trying to simulate the response of a thin diaphragm attached to an open cylindrical cavity to a harmonic pressure. The cylindrical cavity is of 1 mm height and 1 mm diameter, with the top cavity wall replaced by a flexible thin diaphragm of thickness 10 microns. The other walls of the cavity are rigid. The diaphragm is subjected to a harmonic pressure of, say, unit magnitude within the audible range (20 Hz to 20 kHz). The aim is to find the vibration response of the diaphragm and the air pressure inside the cavity.
a) How do I model the cavity? My first thought was to create an enclosure below the diaphragm of the same dimensions as the cavity, but I am not sure if enclosures work that way since it doesn't 'enclose' anything.
b) Assuming I am able to geometrically model the cavity and the diaphragm, how would I create the interface between the two to perform a coupled analysis?