One of the most important phenomena related to electrically actuated micro and nano electromechanical systems (MEMS\NEMS) is dynamic pull-in instability which occurs when the electrical attraction and beam inertia forces are more than elastic restoring force of the beam. According to failure of classical mechanics constitutive equations in prediction of dynamic behavior of small size systems, nonlocal theory is implemented here to analyze the dynamic pull-in behavior. Equation of motion of an electrostatically actuated micro to nano scale doubly clamped beam is rewritten using differential form of nonlocal theory constitutive equation. To analyze the nonlocal effect equation of motion is nondimentionalized. Governing partial differential equation is transformed to an ordinary differential equation using the Galerkin decomposition method and then is solved implementing differential quadrature method (DQM). Change of dynamic pull-in voltage with respect to size change is investigated. Results indicate as the beam length decreases dynamic pull-in voltage increases due to nonlocal effect and the difference with clasical mechanics results is up to 20% for nano beams.
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ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
August 28–31, 2011
Washington, DC, USA
Conference Sponsors:
- Design Engineering Division and Computers and Information in Engineering Division
ISBN:
978-0-7918-5484-6
PROCEEDINGS PAPER
Application of Nonlocal Theory in Dynamic Pull-In Analysis of Electrostatically Actuated Micro and Nano Beams
M. T. Ahmadian,
M. T. Ahmadian
Sharif University of Technology, Tehran, Iran
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Abdolreza Pasharavesh,
Abdolreza Pasharavesh
Sharif University of Technology, Tehran, Iran
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Ali Fallah
Ali Fallah
Sharif University of Technology, Tehran, Iran
Search for other works by this author on:
M. T. Ahmadian
Sharif University of Technology, Tehran, Iran
Abdolreza Pasharavesh
Sharif University of Technology, Tehran, Iran
Ali Fallah
Sharif University of Technology, Tehran, Iran
Paper No:
DETC2011-48862, pp. 255-261; 7 pages
Published Online:
June 12, 2012
Citation
Ahmadian, MT, Pasharavesh, A, & Fallah, A. "Application of Nonlocal Theory in Dynamic Pull-In Analysis of Electrostatically Actuated Micro and Nano Beams." Proceedings of the ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. Volume 7: 5th International Conference on Micro- and Nanosystems; 8th International Conference on Design and Design Education; 21st Reliability, Stress Analysis, and Failure Prevention Conference. Washington, DC, USA. August 28–31, 2011. pp. 255-261. ASME. https://doi.org/10.1115/DETC2011-48862
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