"Could be many things, but from my experience, brake pads might be worn thru and are scraping metal to metal. If so brake pads need replacing. If brake pads are worn thru and not replaced, scoring damage could be accumulating on the brake disc."
It could also be due to a warped or damaged router that would be the big metal disk. but if replacing your brake pads doesn't fix the problem replacing your router will more then likely take care of the noise.
Check the brake pads. The most common cause of the noise is the pad backer grinding against the brake rotor.
Damping makes a sound weak and amplifying makes it strong.
More vibrations....
because the gears are grinding together if its an old car it will make a louder crack sound
it makes a loud squeak
Maracas can produce a range of sound volumes depending on how vigorously they are shaken. The sound can be soft if shaken gently, or loud if shaken more aggressively.
Quantitative
it sounds like the belt is breaking
loud and very noisey that they sound like they are screaming.
Geese
A sound that is perceived as twice as loud requires an increase in sound intensity of approximately 10 decibels. This doubling of perceived loudness corresponds to a tenfold increase in sound intensity.
A slap typically makes a sharp, loud sound characterized by a quick smack or impact. The sound can vary depending on the force and velocity of the slap.