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Analysis of Nano-switches Made of Carbon Nanotubes Under Electric Field and Determining Pull-in Voltage

Khatami Mazgar, Saeed | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45549 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Ahmadian, Mohammad Taghi
  7. Abstract:
  8. The use of carbon nanotubes in Nano-switches is the new technology employed in NEMS. Nano-switches can also perform as a micro-switch where nano-switches have longer life time, consume lower power and have smaller size with respect to micro-switches. As the dimensions get smaller, continuous models lose their accuracy and molecular methods should be utilized. Non local theory, is attempting to change the responses of continuum models assuaging them to the molecular results. In the current project, non local theory is used to rewrite the governing equations of nano tubes motion and the results are compared with the classical results. In this modeling, the axial force and the mid-plane stretching are considered for clamped-clamped beam, effect of short length is assumed for cantilever beam and Van der waals related effects for both cases are considered. Obtaining the static pull-in voltage, three methods including static analysis, fundamental frequency analysis and energy method were used and the results demonstrate good agreement to previous works. Also, to obtain the dynamic pull-in instability, energy method was used. Finally, a linear solution was proposed when the alternating voltage is very little relative to DC, and results show good agreement with numerical method. For frequencies close to the natural frequency of the beam, semi- analytical method of multiple scale is used and answers obtained from this method in the mentioned area predict the real response better than the linear analysis
  9. Keywords:
  10. Electrostatic Actuation ; Carbon Nanotubes ; Pull-in Phenomenon ; Nonlocal Theory

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