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SUMMARY:Towards Tristability in Electrostatically Actuated Micro-Meta-Stru
 ctures - Professor Lior Medina\, Tel Aviv University
DTSTART:20241025T150000Z
DTEND:20241025T160000Z
UID:TALK221206@talks.cam.ac.uk
CONTACT:46601
DESCRIPTION:Current micro-electromechanical systems(MEMS)based structures 
 are either mono or bistable\, and as such are limited to registering one o
 r two values in mechanical sensors/memories/logical gates. However\, with 
 the entrance of AI and Internet-of-Things\, sensory input in integrated sy
 stems is expected to increase\, requiring systems to become more efficient
  and autonomous. That entails sensing more values in a smaller footprint\,
  as well as possessing basic computational abilities. To mitigate that nee
 d\, a new type of a microstructure is required\, that will introduce new a
 bilities such as multistability\, non-volatility\, and reconfigurability\,
  along with built-in memory and embedded computational abilities\, thus al
 lowing the formation of a new class of smart MEMS from which new sensors c
 an be devised.\nThe first generation of such a structure is composed of an
  electrostatically actuated double curved beam\, connected either by a rig
 id truss or an elastic spring\, essentially composing a simple micro-meta-
 structure. It is found that weakly coupled and geometrically different sub
 -structures can manifest global tristablility when introduced to a nonline
 ar\, displacement-dependent\, electrostatic actuation whilst exhibiting bi
 stability when under mechanical\, displacement-independent\, load. The sta
 bility analysis and methodology is established first for strongly coupled 
 double beam structures\, and is then used for the weakly coupled version. 
 In addition\, it was found that electrostatic tristability\, which include
 s statically inaccessible stable branches\, can be manifested in different
  configurations and permutations\, while also showing the presence of a gl
 obal latching point\, unattainable the strongly coupled counterpart. It is
  shown that the energy method can be used to characterise the stability of
  the proposed metastructure\, while also revealing new abilities that can 
 be manifested in a seemingly simple structure. Such findings can promote t
 he usage of such structures in multi-valued MEMS devices\, promoting furth
 er miniaturisation and decreased footprint.\n
LOCATION:JDB Seminar Room\, CUED
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