Page 45 - Singiresu S. Rao-Mechanical Vibrations in SI Units, Global Edition-Pearson (2017)

42 Chapter 1 Fundamentals oF Vibration

Anvil Inner ear
Hammer
Oval window
Auditory nerve

Cochlea

Ear canal
Eardrum

Stirrup
Middle ear

Outer ear
(a) Three parts of the ear

Scala vestibuli
Perilymph

Heli cotrema

Basilar membrane
Scala timpani

(b) Stretched out view of cochlea
FiGure 1.9 Anatomy of an ear.

In spite of its detrimental effects, vibration can be utilized profitably in several con-
sumer and industrial applications. In fact, the applications of vibratory equipment have
increased considerably in recent years [1.21]. For example, vibration is put to work in
vibratory conveyors, hoppers, sieves, compactors, washing machines, electric tooth-
brushes, dentist’s drills, clocks, and electric massaging units. Vibration is also used in pile