|
|
| (One intermediate revision by one other user not shown) |
| Line 1: |
Line 1: |
| '''Cable fairing''' is a structure attached to a towed cable designed to streamline the flow around the cable, primarily in marine environments.
| | I like Stone collecting. <br>I try to learn Arabic in my spare time. <br><br>AdultBunnies.com - Live Sex, Cam Chat, Free Webcams & Private Shows HD<br>The Free Adult Video Chat Community - The Sexiest Live Webcam Chat Erotic Models!<br>See the FREE CAM CHAT or go PRIVATE for the hot LIVE SEX SHOW on AdultBunnies!<br><br>My web page ... [http://www.adultbunnies.com/ Free Real Live Sexual relations Cam Chat Erotic Performances Special High-definition Models Girls] |
| | |
| Cables are faired primarily for two reasons: (1) to reduce normal drag and thus achieve more depth for a given cable scope and speed; and (2) to eliminate cable vibration caused by [[vortex shedding]], commonly known as cable strum.<ref name="Blevins1990">R. D. Blevins, "Flow-Induced Vibration" (Second Edition). New York: Van Nostrand Reinhold, 1990, p. 91.</ref>
| |
| | |
| ==Types of cable fairing==
| |
| There are several major types of cable fairing:
| |
| | |
| *Hard fairing: essentially a streamlined teardrop-shaped shell clamped in sections over the cable;<ref name="Patent4,567,841">Patent 4,567,841 “Fairing assembly for towed underwater cables.”</ref>
| |
| | |
| *Ribbon fairing: flexible ribbons attached to the cable that assume a streamlined shape when towed;<ref name="Patent3,696,599">Patent 3,696,599 “Cable fairing system.”</ref>
| |
| | |
| *Hairy fairing: similar to ribbon fairing, but the “ribbons” take the form of hair-like flexible structures.<ref name="Patent4,084,065">Patent 4,084,065 “Antistrumming cable.”</ref>
| |
| | |
| All cables (faired or unfaired) have hydrodynamic loading functions.<ref name="Folb1975">R. Folb, “Experimental determination of hydrodynamic loading functions for ten cable fairing models.” Report number DTNSRDC-R-4610, David W. Taylor Naval Ship Research & Development Center, 1975.</ref> These describe the variation in drag coefficient as a function of angle <math>a</math> with respect to the flow. As an example, the loading function for the normal drag coefficient of an unfaired cable, represented as a flexible circular cylinder, is sin<sup>2</sup><math>a</math>. (<math>a</math> = 90 degrees means that the cable is normal to the flow.)
| |
|
| |
| ==Operational complexities==
| |
| Fairing a cable can increase the complexity of the handling system. An unfaired cable can be wrapped many times on a winch drum. Some types of faired cable may only permit a single wrap.{{Citation needed|date=December 2009}}
| |
| | |
| Furthermore, many types of hard fairing require the use of anti-stacking rings.<ref name="Mech1985">A. Mech, “Development of an axial load bearing ring for use on double-served [[strength member]] electromechanical marine cable.” ''Oceans'' '''17''', 1001, 1985.</ref> When under tension, the diameter of a steel-armored cable gets smaller. This in turn would cause the fairing sections to loosen and slide down the cable (until they “stack” at the aft end) without the use of the anti-stacking rings.{{Citation needed|date=December 2009}}
| |
| | |
| ==References==
| |
| {{reflist}}
| |
| | |
| [[Category:Fluid dynamics]]
| |
I like Stone collecting.
I try to learn Arabic in my spare time.
AdultBunnies.com - Live Sex, Cam Chat, Free Webcams & Private Shows HD
The Free Adult Video Chat Community - The Sexiest Live Webcam Chat Erotic Models!
See the FREE CAM CHAT or go PRIVATE for the hot LIVE SEX SHOW on AdultBunnies!
My web page ... Free Real Live Sexual relations Cam Chat Erotic Performances Special High-definition Models Girls