undefined | Better HN

0 pointsPEJOE4y ago0 comments

Every rigid object has a fundamental frequency, regardless of whether you put it on a graph.

0 comments

Sure. But the other frequencies need not be integer multiples of the fundamental.

They don't have to, but usually those integer multiples will be present as well. Whether they are dominant or not is another matter but it is quite hard to design something in such a way that if it has a natural resonance at a certain frequency that integer multiples will not be present in the response spectrum.

A typical object will have multiple modes of resonance as well.

enriquto4y ago

> usually those integer multiples will be present as well

"usually", under what probability model? A random 3d or 2d shape will have zero harmonic partials with probability 1. What is hard to achieve is having even a few harmonic partials. A rectangular wooden piece is painstakingly carved to have a couple of harmonic partials, in order to become a xylophone or marimba bar.

1 more reply

j / k navigate · click thread line to collapse

0 comments

enriquto4y ago

Sure. But the other frequencies need not be integer multiples of the fundamental.

jacquesm4y ago

A typical object will have multiple modes of resonance as well.

enriquto4y ago

> usually those integer multiples will be present as well

1 more reply

j / k navigate · click thread line to collapse