Flutter (electronics and communication): Difference between revisions

Revision as of 12:18, 25 November 2010

Revision as of 15:57, 14 January 2011

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== Aeroelastic ==

In the field of [[mechanics]] and structures, '''[[Aeroelastic flutter]]''' is an [[Aeroelasticity|aeroelastic]] phenomenon where a body's own [[aerodynamic]] forces couple with a its [[natural frequency|natural mode]] of [[vibration]] to produce rapid [[periodic motion]].

Aeroelastic flutter occurs under steady flow conditions, when a structure's [[aerodynamic]] forces are affected by and in turn affect the movement of the structure. This sets up a [[positive feedback]]loop exciting the structure's [[Vibration#Types of vibration|free vibration]]. Flutter is self-starting and results in large amplitude vibration which often lead to rapid failure.

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During the 1950s over 100 incidents were recorded of military or civilian aircraft being lost or damaged due to unforeseen flutter events. While as recently as the 1990s jet engine flutter has grounded military aircraft.

Techniques to avoid flutter include changes to the structure's aerodynamics, stiffening the structure to change the excitation frequency and increasing the [[damping]] within the structure.

==See also==