Difference between revisions of "In Wed's lecture slide no.13, why does the block "Drag Aerodynamics" connected to the summation and to the vision system?"

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Q: In Wed's lecture slide no.13, why does the block "Drag Aerodynamics" connected to the summation and to the vision system?
 
Q: In Wed's lecture slide no.13, why does the block "Drag Aerodynamics" connected to the summation and to the vision system?
  
A: I'm not an expert for this system and I think Mary should give a better answer to this question. She's out of town today, so she'll get back to this question by tomorow morning. Please watch for answer by that time. Sorry for the late response.
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A: The direction of arrows matters in a block diagram, which is the source of confusion here. The drag aerodynamics only feed into the summation; the body dynamics feed into the drag aerodynamics.  
  
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The drag aerodynamics go into the summation because they act as a disturbance that moves the fly around. This motion, in addition to the wing motion, determines where the fly is and affects the body dynamics. The body dynamics then feed back into the drag aerodynamics because the orientation of the fly can change how much drag it experiences (heading directly into the wind is pretty different from being broadside to it).
  
--[[User:Ling|Ling Shi]] 3:41pm, 4 Oct 2006 (PDT)
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If you're interested in learning more about this system you should read the following paper:
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[http://www.cds.caltech.edu/~murray/papers/2003p_rei+03-acc.html http://www.cds.caltech.edu/~murray/papers/2003p_rei+03-acc.html]
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--[[User:Mjdunlop|Mary Dunlop]] 09:58, 5 October 2006 (PDT)
  
 
[[Category:CDS 101/110 FAQ - Lecture 2-2]]
 
[[Category:CDS 101/110 FAQ - Lecture 2-2]]

Latest revision as of 16:58, 5 October 2006

Q: In Wed's lecture slide no.13, why does the block "Drag Aerodynamics" connected to the summation and to the vision system?

A: The direction of arrows matters in a block diagram, which is the source of confusion here. The drag aerodynamics only feed into the summation; the body dynamics feed into the drag aerodynamics.

The drag aerodynamics go into the summation because they act as a disturbance that moves the fly around. This motion, in addition to the wing motion, determines where the fly is and affects the body dynamics. The body dynamics then feed back into the drag aerodynamics because the orientation of the fly can change how much drag it experiences (heading directly into the wind is pretty different from being broadside to it).

If you're interested in learning more about this system you should read the following paper: http://www.cds.caltech.edu/~murray/papers/2003p_rei+03-acc.html

--Mary Dunlop 09:58, 5 October 2006 (PDT)