Deployment Mechanisms - Revision history

Yash: /* Deployment Mechanisms */

2018-02-22T09:26:32Z

‎Deployment Mechanisms

2018-02-22T09:23:31Z

‎Deployment Mechanisms

2018-02-22T09:21:14Z

‎Deployment Mechanisms

2018-02-22T09:20:56Z

‎Deployment Mechanisms

2018-02-22T09:08:10Z

‎Deployment Mechanisms

2018-02-22T09:02:03Z

‎Paraffin release mechanism

2018-02-22T09:01:43Z

‎Disadvantages

2018-02-22T09:00:28Z

‎Disadvantages

2018-02-22T09:00:09Z

‎Disadvantages

2018-02-22T08:48:57Z

‎Shape Memory Alloy (SMA)

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 * '''Telescopic:''' This mechanism uses compression of a long structure into smaller structure by sliding one part into another.
 [[File:Telescopic2.png|thumb|center|400px|Telescopic]]
-* '''Foldable Mast:''' The structure of the mast is broken into smaller parts of the shape of a triangle and connected with the help of plastic flexible hinges to stiffen the folded structure once deployed.
+* '''Foldable Mast:''' The structure of the mast is broken into smaller parts of the shape of a triangle and connected with the help of plastic flexible hinges to stiffen the folded structure once deployed. Good images can be found [http://mechanismsrobotics.asmedigitalcollection.asme.org/article.aspx?articleid=2474215 here].
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 If you are done reading this page, you can go back to [[Mechanical Subsystem]]

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 ==Deployment Mechanisms ==
 Here are some commonly used mechanisms:
-* '''Coilable Mast:''' This an important mechanism for deployment of structures such as antennas. The mast is flexible in nature and coiled on a reel to reduce the dimension during launch.
+* '''Coilable Mast:''' This an important mechanism for deployment of structures such as antennas. The mast is flexible in nature and coiled on a reel to reduce the dimension during launch. A good image can be found [https://www.jpl.nasa.gov/nmp/st8/tech/sailmast_tech3.html here].
 * '''Lazy Tongs:''' The actual definition for this being scissor-like extendable structure used to reach things at a distance. These type of structures are employed when space constraints are imposed on one dimension of structures.
 [[File:LazyTongs2.png|frame|center|A representative image for lazy tongs. Image reproduced from [https://www.flickr.com/photos/internetarchivebookimages/14742323506 here]]]

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 [[File:LazyTongs2.png|frame|center|A representative image for lazy tongs. Image reproduced from [https://www.flickr.com/photos/internetarchivebookimages/14742323506 here]]]
 * '''Telescopic:''' This mechanism uses compression of a long structure into smaller structure by sliding one part into another.
-[[File:Telescopic2.png|thumb|center|200px|Telescopic]]
+[[File:Telescopic2.png|thumb|center|400px|Telescopic]]
 * '''Foldable Mast:''' The structure of the mast is broken into smaller parts of the shape of a triangle and connected with the help of plastic flexible hinges to stiffen the folded structure once deployed.
 [[File:FoldableMast.png|thumb|250px|Foldable Mast]]

@@ Line 54: / Line 54: @@
 [[File:LazyTongs2.png|frame|center|A representative image for lazy tongs. Image reproduced from [https://www.flickr.com/photos/internetarchivebookimages/14742323506 here]]]
 * '''Telescopic:''' This mechanism uses compression of a long structure into smaller structure by sliding one part into another.
-[[File:Telescopic.png|frame|center|Telescopic]]
+[[File:Telescopic2.png|thumb|center|200px|Telescopic]]
 * '''Foldable Mast:''' The structure of the mast is broken into smaller parts of the shape of a triangle and connected with the help of plastic flexible hinges to stiffen the folded structure once deployed.
 [[File:FoldableMast.png|thumb|250px|Foldable Mast]]

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 * '''Coilable Mast:''' This an important mechanism for deployment of structures such as antennas. The mast is flexible in nature and coiled on a reel to reduce the dimension during launch.
 * '''Lazy Tongs:''' The actual definition for this being scissor-like extendable structure used to reach things at a distance. These type of structures are employed when space constraints are imposed on one dimension of structures.
-[[File:LazyTongs.png|frame|center|Lazy Tongs]]
+[[File:LazyTongs2.png|frame|center|A representative image for lazy tongs. Image reproduced from [https://www.flickr.com/photos/internetarchivebookimages/14742323506 here]]]
 * '''Telescopic:''' This mechanism uses compression of a long structure into smaller structure by sliding one part into another.
 [[File:Telescopic.png|frame|center|Telescopic]]

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 === Paraffin release mechanism ===
 This mechanism uses the property of paraffin wax to expand greatly on heating it. This causes it to compress a cylindrical casing which holds a pin initially. As the casing (made of polymer) gets squeezed it releases the pin, slowly triggering the deployment
 ==== Advantages ====

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 ==== Disadvantages ====
 Slow deployment, spontaneous trigger at elevated temperature
 ==Deployment Mechanisms ==

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 More information about Shape Memory Alloys and their space heritage can be found [http://www.esa-tec.eu/space-technologies/from-space/new-shape-memory-alloy-for-high-transformation-temperature/ here].
 === Paraffin release mechanism ===

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 ====Disadvantages====
 They are not yet tested extensively in space and are in development, some parts are too small and difficult to manufacture hence are expensive currently. Also they may be susceptible to external rise in temperature and cause untimely deployment
-[[File:SMA2.jpg|frame|center]]
+----
 === Paraffin release mechanism ===

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 === Shape Memory Alloy (SMA) ===
-[[File:LinearActuator2.gif|thumb|Conceptual design of a basic traveling-nut linear actuator. Note that in this example the lead screw (gray) rotates while the lead nut (yellow) and tube (red) do not. Attribution: Public Domain, https://en.wikipedia.org/w/index.php?curid=12285672]]
+[[File:LinearActuator2.gif|right|frame|Conceptual design of a basic traveling-nut linear actuator. Note that in this example the lead screw (gray) rotates while the lead nut (yellow) and tube (red) do not. Attribution: Public Domain, https://en.wikipedia.org/w/index.php?curid=12285672]]
 A SMA is an alloy that “remembers” its original shape when it was formed and returns to it from its deformed state  when heated. There are multiple actuators already in use as well as several under development that exploit use of SMAs for release of the deployable. <br \>
 Some of the mechanisms that use SMAs are listed: