Tailoring the nonlinear response of MEMS resonators using shape optimization

Lily L. Li, Pavel M. Polunin, Suguang Dou, Oriel Shoshani, B. Scott Strachan, Jakob Søndergaard Jensen, Steven W. Shaw, Kimberly L. Turner

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    Abstract

    We demonstrate systematic control of mechanical nonlinearities in micro-electromechanical (MEMS) resonators using shape optimization methods. This approach generates beams with non-uniform profiles, which have nonlinearities and frequencies that differ from uniform beams. A set of bridge-type microbeams with selected variable profiles that directly affect the nonlinear characteristics of in-plane vibrations was designed and characterized. Experimental results have demonstrated that these shape changes result in more than a three-fold increase and a two-fold reduction in the Duffing nonlinearity due to resonator mid-line stretching. The manipulation of this nonlinearity has significant interest in many applications, including precise mass sensing, accurate measurement of angular rates, and timekeeping. Published by AIP Publishing.
    Original languageEnglish
    Article number081902
    JournalApplied Physics Letters
    Volume110
    Issue number8
    Number of pages5
    ISSN0003-6951
    DOIs
    Publication statusPublished - 2017

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