I think I've mislead with the title...
There's a rotating inflated tube that is in constant contact with a surface. You can hear the noise from this contact and the frequencies have distinctive peaks due to the resonance in tube... I'm trying to figure out how to calculate mathematically those...
Hey!
I understand frequency calculations in tubes, open ended or closed, however what would you classify a tube ring? Imagine a rube ring brushing against something constantly, if the tube was static and it made contact with something, you'll get waves traveling around in both directions...