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SUMMARY:Compact Folding of Flat Arrays Composed of Panels with Uniform Thi
 ckness - Zhong You\, University of Oxford
DTSTART:20220506T140000Z
DTEND:20220506T150000Z
UID:TALK173861@talks.cam.ac.uk
CONTACT:Mishael Nuh
DESCRIPTION:Many aerospace arrays have large flat profiles composed of reg
 ular polygonal panels. They need to be packaged into small volumes for lau
 nch\, and subsequently deployed to seamless flat surfaces once in orbit. E
 xamples of such structures include solar arrays and reflectarray antennas\
 , which are made from rigid thick panels. It is always very challenging to
  package such arrays compactly without any voids\, especially when they ar
 e composed of panels with uniform thickness and are designed to have bi-di
 rectional deployment with a small number of degrees of freedom. In this ta
 lk\, I shall demonstrate a kirigami based approach that enables compact fo
 lding of such arrays without any voids.\n\nOrigami and kirigami have great
  advantages in folding large thin sheets into compact volumes. However\, w
 hen thick panels are involved\, origami based approaches often lead to lar
 ge gaps along the hinges or uneven surfaces in deployed states. In the new
 ly proposed approach\, a thick-panel deployable kirigami element is first 
 introduced using the Hamitonian circuit in which eight panels with shapes 
 of isosceles triangles and parallelograms are connected together by revolu
 te joints. It is effectively an eight-link closed kinematic chain\, named 
 as an 8R element\, that can be folded compactly without any voids. After t
 hat\, four such elements are coupled together to form a deployable structu
 re with a single degree-of-freedom. More 8R elements can be added to tesse
 llate a plane. Although slits are introduced in the tessellation to accomm
 odate thick panels during the folding process\, they are completely closed
  in the fully deployed states. Therefore\, a completely flat array made fr
 om thick panels with uniform thickness is obtained that retains the compac
 t folding property of its constituent elements.
LOCATION:CivEng Seminar Room (1-33) (Civil Engineering Building)
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