Nonlinear Dynamics

, Volume 67, Issue 1, pp 859–883

Nonlinear damping in a micromechanical oscillator

  • Stav Zaitsev
  • Oleg Shtempluck
  • Eyal Buks
  • Oded Gottlieb
Original Paper

Abstract

Nonlinear elastic effects play an important role in the dynamics of microelectromechanical systems (MEMS). A Duffing oscillator is widely used as an archetypical model of mechanical resonators with nonlinear elastic behavior. In contrast, nonlinear dissipation effects in micromechanical oscillators are often overlooked. In this work, we consider a doubly clamped micromechanical beam oscillator, which exhibits nonlinearity in both elastic and dissipative properties. The dynamics of the oscillator is measured in both frequency and time domains and compared to theoretical predictions based on a Duffing-like model with nonlinear dissipation. We especially focus on the behavior of the system near bifurcation points. The results show that nonlinear dissipation can have a significant impact on the dynamics of micromechanical systems. To account for the results, we have developed a continuous model of a geometrically nonlinear beam-string with a linear Voigt–Kelvin viscoelastic constitutive law, which shows a relation between linear and nonlinear damping. However, the experimental results suggest that this model alone cannot fully account for all the experimentally observed nonlinear dissipation, and that additional nonlinear dissipative processes exist in our devices.

Keywords

MEMS Duffing oscillator Nonlinear damping Saddle-node bifurcation Parameter identification Forced vibration 

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Stav Zaitsev
    • 1
  • Oleg Shtempluck
    • 1
  • Eyal Buks
    • 1
  • Oded Gottlieb
    • 2
  1. 1.Department of Electrical EngineeringTechnion–Israel Institute of TechnologyHaifaIsrael
  2. 2.Department of Mechanical EngineeringTechnion–Israel Institute of TechnologyHaifaIsrael

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