Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 40, Issue 6, Pages 1649-1654Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/40/6/011
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The influences of Casimir and van der Waals forces on the nano-electromechanical systems (NEMS) electrostatic torsional varactor are studied. A one degree of freedom, the torsional angle, is adopted, and the bifurcation behaviour of the NEMS torsional varactor is investigated. There are two bifurcation points, one of which is a Hopf bifurcation point and the other is an unstable saddle point. The phase portraits are also drawn, in which periodic orbits are around the Hopf bifurcation point, but the periodic orbit will break into a homoclinic orbit when meeting the unstable saddle point.
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