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RISS 인기검색어
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- 저자 : Hamed Raeisifard (검색결과 1 건)
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Mansour Nikkhah Bahrami,Aghil Yousefi-Koma,Hamed Raeisifard 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.1
In this paper, a comprehensive model of a micro-switch with both electrostatic and piezoelectric excitations, which accounts for thenonlinearities due to inertia, curvature, electrostatic forces and piezoelectric actuator is presented to demonstrate the mechanical characteristicsof such a micro-system. Dynamic equations of this model are derived by the Lagrange method. Static analysis of this model is performedwith five modes through the Galerkin method. The micro-switch beam is assumed as an elastic Euler-Bernoulli beam withclamped-free end conditions. The electrostatic actuation results are compared with other existing experimental and numerical results. Whereas the major drawback of electrostatically actuated micro-switches is the high driving voltage, using the piezoelectric actuator inthese systems can provide less driving voltage and control the pull-in voltage. The study demonstrates that when the ratio of electrostaticactuation distance to length of micro-switch is small, the nonlinear piezoelectric term has a significant effect on the pull-in phenomenon. There are three ways to influence the design and control of the mechanical characteristics of this micro-switch: the softening effect due toelectrostatic actuation, the hardening effect due to piezoelectric actuation, and varying the length and thickness of the piezoelectric actuator.
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