Tether: Difference between revisions
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{{Short description|Cord for anchoring a movable object}} |
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{{Other uses}} |
{{Other uses}} |
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{{Not to be confused with|Teether}} |
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A '''tether''' is a cord, fixture, or flexible attachment that characteristically anchors something movable to something fixed; it also may be used to connect two movable objects, such as an item being [[towing|towed]] by its tow. |
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A '''tether''' is a cord, fixture, or signal that anchors something movable to a reference point which may be fixed or moving. There are a number of applications for tethers: balloons, kites, [[High-altitude wind power|tethered wind-energy conversion systems]], [[anchor]]s, tethered water-flow energy conversion systems, towing, [[Leash|animal constraint]], and [[Power kite|power-kiting]]. Tethers may break by various means; if a tether is a signal, then interruption by signal barriers breaks the tether. If the tether is a cord or rope, then upon reaching the breaking strength of the tether, the tether fails in its function. [[Failure mode]]s for tethers are considered when designing arrangements where a tether is needed.<ref>{{cite book|last=Bekey|first=Ivan|title=Advanced Space System Concepts and Technologies, 2010-2030+|year=2003|publisher=Aerospace Press ; American Institute of Aeronautics and Astronautics|location=El Segundo, Calif. : Reston, Va.|isbn=9781884989124|url=http://books.google.com/books?id=S4u1UgfxnHcC&pg=PA33&dq=tethers&hl=en&sa=X&ei=uLD3TsmoIKHr0gGL5uyuAg&ved=0CGgQ6AEwCA#v=onepage&q=tethers&f=false|page=33}}</ref> When a tether or line breaks suddenly, backlash of the segments may cause severe damage or loss of life; safety links are sometimes used to prevent excessive tension in a tether involved in towing objects or persons, like in the towing of [[sailplane]]s; the safety link in a tether is thus a tether itself. Tethering objects to prevent theft of an object like a computer at a school or library is now commonly seen.<ref>{{cite book|first=ed. by Seymour Bosworth|title=Computer Security Handbook|year=2002|publisher=Wiley|location=New York, NY|isbn=9780471412588|url=http://books.google.com/books?id=JDXB8WTppk0C&lpg=RA2-PA19&dq=tethers%20theft-prevention&pg=RA2-PA20#v=onepage&q=tether&f=false|page=19}}</ref> |
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Applications for tethers include: [[fall arrest system]]s, [[lanyards]], balloons, kites, [[airborne wind power|airborne wind-power systems]], [[anchor]]s, floating water power systems, towing, [[leash|animal constraint]], [[space tether|space walks]], [[power kite]]ing, and [[anti-theft]] devices.<ref>{{cite book|editor-first1=Seymour|editor-last1=Bosworth|editor-first2=M. E.|editor-last2=Kabay|title=Computer Security Handbook|year=2002|publisher=Wiley|location=New York, NY|isbn=978-0-471-41258-8|url=https://books.google.com/books?id=JDXB8WTppk0C&q=tether&pg=RA2-PA20|page=19}}</ref> |
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==Failure== |
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[[Failure mode]]s for tethers are considered in their design.<ref>{{cite book|last=Bekey|first=Ivan|title=Advanced Space System Concepts and Technologies, 2010-2030+|year=2003|publisher=Aerospace Press; American Institute of Aeronautics and Astronautics|location=El Segundo, Calif. : Reston, Va.|isbn=978-1-884989-12-4|url=https://books.google.com/books?id=S4u1UgfxnHcC&q=tethers&pg=PA33|page=33}}</ref> A cord or rope tether may reach its [[breaking strength]] and fail. Outcomes can include an injury or fatal fall, and damage or loss of life to personnel or bystanders caused by backlash of the ruptured segments. |
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Failure-prevention may be designed into a tethering system. Some [[safety harness]]es are used in combination with a [[shock absorber|shock-absorbing]] [[lanyard]], which has break-away stitching designed into it to prevent material failure and regulate [[deceleration]], thereby preventing a serious [[G-force]] injury to the user when the end of the rope is reached. |
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Designed-to-fail safety links are sometimes used to prevent excessive tension in a tether involved in towing objects, such as [[sailplane]]s. |
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A signal tether is a system in which a constant signal designates a positive condition, and its interruption, whether by discontinuation or jamming, conveys a failure. The signal may be electrically generated, or a physical device such as flying a flag. |
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==See also== |
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* [[Umbilical cable]] |
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* [[Safety lanyard]] |
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==References== |
==References== |
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{{reflist}} |
{{reflist}} |
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== External links == |
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* {{official website|https://techsander.com/what-is-a-tether-violation/|name=What is a Tether Violation?}} by TechSander.com |
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{{tech-stub}} |
{{tech-stub}} |
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Latest revision as of 22:02, 17 June 2024
A tether is a cord, fixture, or flexible attachment that characteristically anchors something movable to something fixed; it also may be used to connect two movable objects, such as an item being towed by its tow.
Applications for tethers include: fall arrest systems, lanyards, balloons, kites, airborne wind-power systems, anchors, floating water power systems, towing, animal constraint, space walks, power kiteing, and anti-theft devices.[1]
Failure
[edit]Failure modes for tethers are considered in their design.[2] A cord or rope tether may reach its breaking strength and fail. Outcomes can include an injury or fatal fall, and damage or loss of life to personnel or bystanders caused by backlash of the ruptured segments.
Failure-prevention may be designed into a tethering system. Some safety harnesses are used in combination with a shock-absorbing lanyard, which has break-away stitching designed into it to prevent material failure and regulate deceleration, thereby preventing a serious G-force injury to the user when the end of the rope is reached.
Designed-to-fail safety links are sometimes used to prevent excessive tension in a tether involved in towing objects, such as sailplanes.
A signal tether is a system in which a constant signal designates a positive condition, and its interruption, whether by discontinuation or jamming, conveys a failure. The signal may be electrically generated, or a physical device such as flying a flag.
See also
[edit]References
[edit]- ^ Bosworth, Seymour; Kabay, M. E., eds. (2002). Computer Security Handbook. New York, NY: Wiley. p. 19. ISBN 978-0-471-41258-8.
- ^ Bekey, Ivan (2003). Advanced Space System Concepts and Technologies, 2010-2030+. El Segundo, Calif. : Reston, Va.: Aerospace Press; American Institute of Aeronautics and Astronautics. p. 33. ISBN 978-1-884989-12-4.
External links
[edit]- What is a Tether Violation? by TechSander.com
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