| 词条 | Marman clamp |
| 释义 |
A Marman clamp is a type of heavy-duty band clamp; it allows two flat cylindrical interfaces to be simply clamped together with a ring clamp. It is sometimes also known as a "Marman ring". Hose connectorsA common use for Marman clamps is as quick-disconnect connectors in flexible aircraft fuel lines.[1] Spacecraft separationMarman clamps are used extensively in spaceflight systems and are common mechanical load-transfer and clamping mechanisms for connecting the upper stage and the satellite payload of space vehicles,[2][3] for example, on the Cassini Plasma Spectrometer on the Cassini orbiter. They may also be used to join stages of a booster rocket.[2] Early separation systems using Marman clamps used explosive bolts for release. These have problems of unpredictability, the need to contain debris and difficulties in testing them.[4] A more recent approach uses a screw thread. The tension of the clamp band itself is used to power the unscrewing of a central bolt, when released by a NASA Standard Initiator (NSI), a pyrotechnic pin puller.[5] HistoryThe Marman clamp was first produced by Herbert Marx, better known by his stage name of Zeppo Marx;[1][6] it was manufactured by his company, Marman Products from the 1930s.[7] At the time it was designed to secure cargo during transport. The U.S. Military used Marman clamps to transport the atomic bombs used at the end of the Second World War. Marman clamps are found in many modern moving vehicles, though the screw band type clamp is becoming more popular. The name is often incorrectly spelled "Marmon".{{citation needed|date=October 2012}} See also
References1. ^1 {{cite web |last=D’Alto |first=Nick |title=Oldies and Oddities: Zeppo’s Gizmo |url=http://www.airspacemag.com/history-of-flight/oldies-amp-oddities-zeppos-gizmo-729132/?no-ist |publisher=AIR & SPACE MAGAZINE|accessdate=11 March 2014}} 2. ^1 {{cite web |title=Marman Clamp System Design Guidelines |url=http://engineer.jpl.nasa.gov/practices/2214.pdf |work=Guideline no. GD-ED-2214 |publisher=NASA |accessdate=2012-10-20 }} 3. ^{{cite journal |last=Shoghi |first=K. |last2=Rao |first2=H. V. |last3=Barrans |first3=Simon |title=Stress in V-section band clamps. Proceedings of the Institute of Mechanical Engineering Part C |journal=Journal of Mechanical Engineering Science |date=2004 |volume=218 |series=3 |pages=251–261 |url=http://eprints.hud.ac.uk/1635/1/fulltext.pdf|accessdate=11 March 2014 |doi=10.1243/095440604322900381}} 4. ^{{cite web |last=Lazansky |first=Chuck |title=Refinement of a Low-Shock Separation System |url=http://www.esmats.eu/amspapers/pastpapers/pdfs/2012/lazansky.pdf |work=Proc. of the 41st Aerospace Mechanisms Symposium |publisher=Jet Propulsion Laboratory |accessdate=11 March 2014 |year=2012 |ref={{harvid|Lazansky|2012}} |page=332}} 5. ^{{harvnb|Lazansky|2012| |page=333 }} 6. ^Chandler, Charlotte. Hello, I Must Be Going: Groucho And His Friends, page 182, {{ISBN|978-1-84739-104-9}}. 7. ^Trevor Homer Born in the USA: The Book of American Origins,Skyhorse Publishing Inc., 2009 {{ISBN|1602397112}} "Zeppo Marx" External links
3 : Clamps (tool)|Plumbing|Spaceflight technologies |
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