Why does the wine glass sing?

Ah know ya’ll like a tipple or two. Who don’t? So ya’ll know how a-strokin and a-rubbin a wet finger on a wine glass can put some sounds up.

Now Oleg “Chaser” Kirillov at Moscow State Lomonosov University says we ain’t got no ah-dear how this process of sound generation works. And to clarify things for ya’ll, he’s worked out how it occurs by considerin “a gyroscopic system with two degrees of freedom under the action of small dissipative and non-conservative positional forces, which has its origin in the models of rotating bodies of revolution being in frictional contact.

Apparently friction causes the glass to resonate at a frequency that generates sound (doh!).

Chaser Kirrolov says that if ya’ll have disc breaks that are a-squealin and a-screechin, then the same effect is to blame.

But heads up, Chaser: what we need to know is not what makes ’em squeal, but what’ll make ’em stop.

Ref: arxiv.org/abs/0708.0967: How to Play a Disc Brake

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