Flutter (electronics and communication): Difference between revisions

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Revision as of 22:00, 7 February 2008

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{{wiktionary|flutter}}

In [[electronics]] and [[communication]], '''flutter''' is the rapid [[variation]] of [[Signalling (telecommunication)|signal]] parameters, such as [[amplitude]], [[Phase (waves)|phase]], and [[frequency]].

In [[Aeroelasticity|aeroelastic]] structures, flutter refers to rapid [[periodic motion]] caused by interaction of [[structural mass]], stiffness, and [[aerodynamic]] forces.

In structural terms, '''flutter''' refers to an [[Aeroelasticity|aeroelastic]] phenomenon where [[aerodynamic]] forces couple with a structure's [[natural frequency|natural]] mode of [[vibration]] to produce rapid [[periodic motion]]. Aeroelastic Flutter is self-starting with [[positive feedback]] between the structure's [[Vibration#Types of vibration|free vibration]] and the [[aerodynamic]] forces, this results in large amplitudes and can lead to rapid failure. Because of this, structures exposed to aerodynamic forces - such as aerofoils, chimneys and bridges - are normally carefully designed to avoid aeroelastic flutter.

Examples of flutter are:

In the field of [[electronics]] and [[communication]], '''flutter''' is the rapid [[variation]] of [[Signalling (telecommunication)|signal]] parameters, such as [[amplitude]], [[Phase (waves)|phase]], and [[frequency]].

Examples of electronic flutter are:

*Rapid variations in received signal levels, such as variations that may be caused by [[atmospheric]] disturbances, [[antenna (electronics)|antenna]] movements in a [[high wind]], or interaction with other signals.

*In [[radio propagation]], a phenomenon in which nearly all radio signals that are usually reflected by ionospheric layers in or above the E-region experience partial or complete [[Absorption (electromagnetic radiation)|absorption]].

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*The variation in the transmission characteristics of a loaded [[telephone]] [[telecommunication circuit|circuit]] caused by the action of telegraph direct currents on the [[loading]] coils.

*In recording and reproducing equipment, the deviation of [[frequency]] caused by irregular mechanical motion, ''e.g.,'' that of capstan angular velocity in a tape transport mechanism, during operation.

==See also==