Abstract
Nonlinear dynamic response of nanomechanical resonator is of very important characteristics in its application. Two categories of the tension-dominant and curvature-dominant nonlinearities are analyzed. The dynamic nonlinearity of four beam structures of nanomechanical resonator is quantitatively studied via a dimensional analysis approach. The dimensional analysis shows that for the nanomechanical resonator of tension-dominant nonlinearity, its dynamic nonlinearity decreases monotonically with increasing axial loading and increases monotonically with the increasing aspect ratio of length to thickness; the dynamic nonlinearity can only result in the hardening effects. However, for the nanomechanical resonator of the curvature-dominant nonlinearity, its dynamic nonlinearity is only dependent on axial loading. Compared with the tension-dominant nonlinearity, the curvature-dominant nonlinearity increases monotonically with increasing axial loading; its dynamic nonlinearity can result in both hardening and softening effects. The analysis on the dynamic nonlinearity can be very helpful to the tuning application of the nanomechanical resonator.
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The project was supported by the National Natural Science Foundation of China (10721202 and 11023001) and the Chinese Academy of Sciences (KJCX2-EW-L03).
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Zhang, Y., Liu, Y. & Murphy, K.D. Nonlinear dynamic response of beam and its application in nanomechanical resonator. Acta Mech Sin 28, 190–200 (2012). https://doi.org/10.1007/s10409-011-0501-5
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DOI: https://doi.org/10.1007/s10409-011-0501-5