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  • Research progress about the influence of van der Waals force on the dynamic stability of NEMS
    Author:   | Date:2006-03-16   | Click Rate:    | 【Close
    Innovative research progress has been made recently by Professor Zhao Ya-Pu’s research team in studying the influence of van der Waals force on the dynamic stability of nanoelectromechanical systems (NEMS). The dimensionless equilibrium equations of electrostatic torsional actuators are presented with the consideration of the vdW torque in the paper. With the vdW effect, the inherent instability of the actuators is dependent on the scales of structures. The critical tilting angle approximately keeps constant only in micron or larger scales, but it is not constant when the gap between two plates is in nano-scales. The pull-in voltage is also lower than that without consideration of vdW torque. Without the electrostatic torque, the pull-in can still occur with small angle perturbation, and a critical gap is derived. Furthermore, the qualitative analysis of the equation of motion shows that the equilibrium points of the corresponding autonomous system include stable focus point and center points, as well as unstable saddle points. The Hopf bifurcation points and fork bifurcation points also exist in the system. The phase portraits show the periodic, heteroclinic and homoclinic orbits. This paper has been published in “International Journal of Solids and Structures, 2006, 43: 675–685.” Professor Zhao Ya-Pu has been invited to give a plenary lecture at the international workshop entitled “Dispersion Forces and Nano-Electro-Mechanical Systems” to be held during 11 Dec. 2006-15 Dec. 2006 in the Netherlands, Prof. Zhao’s lecture will on the influence of surface forces on the stability of NEMS.
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