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SPAA 260 Vibration Reading

by: Molly O'Keefe

SPAA 260 Vibration Reading SPAA 260

Molly O'Keefe

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About this Document

These notes are over the assigned readings of vibration articles
SPAA 260
Dr. Shaffer
Class Notes
speech pathology
25 ?




Popular in SPAA 260

Popular in Linguistics and Speech Pathology

This 1 page Class Notes was uploaded by Molly O'Keefe on Wednesday January 20, 2016. The Class Notes belongs to SPAA 260 at Ball State University taught by Dr. Shaffer in Spring 2016. Since its upload, it has received 21 views. For similar materials see SPAA 260 in Linguistics and Speech Pathology at Ball State University.


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Date Created: 01/20/16
Notes on assigned readings ▯ Vibrational Motion  Bobble head dolls: wiggle, vibrate, oscillate. Goes back and forth, but not forever. They then die off and assume normal resting position  What causes objects to vibrate? o Resting position: Position when it is not vibrating. Also referred to as the equilibrium position when it is at its equilibrium. It is considered to be in a state of equilibrium. o State of equilibrium: Experiencing a balance of forces  Add up to an overall net force of 0 newton’s. Will remain at an equilibrium until disturbed.  When the equilibrium is disturbed, vibration begins. o Damping: The tendency of vibration, motion ceases as energy is displaced  The restoring force: The force that slows the bobble head down as it moves away from its equilibrium, acts upon it to move it back to its original equilibrium. o Forces, when moving, do not stop a balanced object ▯ Substrate-borne vibration  Substrate borne vibration: Helps animals to “hear” o 150,000 insects use  Particle motion defines the vibration  Boundary vibrations: Occur at the interface (boundary) between 2 media (sound/air, air/water, etc.)  Vibrations pass from one medium to aother  Substrate borne are more difficult to avoid producing  32 species in 11 families use it  Used through drumming  Detected through skin & joints, carried as an action potential to spinal nerves and cord and up to brain where it is decoded. ▯ ▯


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