Resonance Testing Method

eskenig

1. The problem statement, all variables and given/known data
Hello,
I'm working on a semester project a measurements class at my college. We are measuring the affects of different materials on the resonance of chambers. We are testing two chambers, one in the shape of a rectangular prism, one in the shape of a cylinder. We will be taking measurements at various positions in the rectangular prism on two axes and the cylinder will be tested axially. I have been trying to find precedence of such experiments but have not had much luck for one reason or another. (If you know of any links that talk about this, it would be appreciated if you responded with them)

In any event my questions are about a few things that have not been decided with the method.
1. Where do we mount the speaker that emits the frequencies we're testing? Does it to go inside, outside? Centered/off center? Does it even matter?

2. What step in frequency should I use? Or would it be better to to a continuously varied frequency at each position we test at and then run an FFT on those results to find the frequencies.

3. Since I'm dealing with basic geometric shapes (more or less, they will be slightly affected by the materials lining the insides) are there existing equations for calculating resonance frequencies?

Any other thoughts on the project are welcome, I'm just trying to finalize our method so we can actually begin the experiment.