Dynamic Pull-in Instability of Nano-Actuators in the Presence of a Dielectric Layer

Journal of Optoelectronical Nanostructures

مقاله 2، دوره 1، شماره 2، مهر و آبان 2016، صفحه 9-30   

نوع مقاله: Articles

نویسندگان

Mohammad Ghalambaz^{* 1}؛ Ali J Chamkha²؛ Mehdi Ghalambaz¹؛ Mohammad Edalatifar³

¹Department of Mechanical Engineering, Dezful Branch, Islamic Azad University, Dezful, Iran

²Mechanical Engineering Department, Prince Mohammad Bin Fahd University, Al-Khobar, 31952, Saudi Arabia.

³Department of Electrical Engineering, Dezful Branch, Islamic Azad University, Dezful, Iran

تاریخ دریافت: 09 تیر 1395،  تاریخ بازنگری: 24 تیر 1395،  تاریخ پذیرش: 25 مرداد 1395 

چکیده

The natural frequency and pull-in instability of clamped-clamped nano-actuators in the presence of a dielectric layer are analyzed. The influence of the presence of Casimir force, electrostatic force, fringing field effect, axial force, stretching effects and the size effect are taken into account. The governing equation of the dynamic response of the actuator is transformed in a non-dimensional form. The Galerkin decomposition method is employed to decompose the equations in time and space. Then, the obtained decomposed governing equations are solved numerically. The results show that the presence of the size effect and the axial force increases the natural frequency of the system. It is found that there is a unique value of the dielectric layer, in which the pull-in deflections of the nano-actuators are independent of the Casimir force, size effect and the axial loads. The advantage of this dielectric layer can be utilized in the design of nano-actuators and nano-sensors in the nanoscale.

کلیدواژه‌ها

dielectric layer؛ nano-actuator؛ natural frequency؛ pull-in instability

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