Atetheris 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 beingtowedby 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,andanti-theftdevices.[1]
Failure
editFailure modesfor tethers are considered in their design.[2]A cord or rope tether may reach itsbreaking strengthand 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. Somesafety harnessesare used in combination with ashock-absorbinglanyard,which has break-away stitching designed into it to prevent material failure and regulatedeceleration,thereby preventing a seriousG-forceinjury 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 assailplanes.
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
editReferences
edit- ^Bosworth, Seymour; Kabay, M. E., eds. (2002).Computer Security Handbook.New York, NY: Wiley. p. 19.ISBN978-0-471-41258-8.
- ^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.ISBN978-1-884989-12-4.
External links
edit- What is a Tether Violation?by TechSander
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