Car suspension: Designing vibration control is undertaken as part of acoustic, automotive or mechanical engineering. One of the possible modes of vibration of a circular drum (see other modes). Hence, attempts to reduce noise are often related to issues of vibration. vocal cords) these pressure waves can also induce the vibration of structures (e.g. Sound, or pressure waves, are generated by vibrating structures (e.g. The studies of sound and vibration are closely related (both fall under acoustics). Careful designs usually minimize unwanted vibrations. Such vibrations could be caused by imbalances in the rotating parts, uneven friction, or the meshing of gear teeth. For example, the vibrational motions of engines, electric motors, or any mechanical device in operation are typically unwanted. In many cases, however, vibration is undesirable, wasting energy and creating unwanted sound. Vibration can be desirable: for example, the motion of a tuning fork, the reed in a woodwind instrument or harmonica, a mobile phone, or the cone of a loudspeaker. the movement of a tire on a gravel road). the periodic motion of a pendulum), or random if the oscillations can only be analysed statistically (e.g. Vibration may be deterministic if the oscillations can be characterised precisely (e.g. Vibration (from Latin vibrÅ 'to shake') is a mechanical phenomenon whereby oscillations occur about an equilibrium point.
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