کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
783440 1465318 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Non-linear dynamic instability of a double-sided nano-bridge considering centrifugal force and rarefied gas flow
ترجمه فارسی عنوان
بی ثباتی دینامیکی غیر خطی یک نانو پل دو طرفه با توجه به نیروی گریز از مرکز و جریان گاز پراکنده
کلمات کلیدی
نانو پل، نیروی گریز از مرکز، جریان نادرست بی ثباتی دردناک پویا، نظریه گرانش فشار، نیروهای پراکنده
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی


• Dynamic instability of double-sided electromechanical nano-sensors is presented.
• The presence of centrifugal force and rarefied gas flow is considered.
• The strain gradient elasticity theory is employed to capture the size-dependency.
• The impacts of damping, length scale and dispersion force parameters is studied.

Double-sided electromechanical nano-bridges can potentially be used as angular speed sensors and accelerometers in rotary systems such as turbine blades and vacuum pumps. In such applications, the influences of the centrifugal force and rarefied flow should be considered in the analysis. In the present study, the non-linear dynamic pull-in instability of a double-sided nano-bridge is investigated incorporating the effects of angular velocity and rarefied gas damping. The non-linear governing equation of the nanostructure is derived using Euler-beam model and Hamilton׳s principle including the dispersion forces. The strain gradient elasticity theory is used for modeling the size-dependent behavior of the system. The reduced order method is also implemented to discretize and solve the partial differential equation of motion. The influences of damping, centrifugal force, length scale parameters, van der Waals force and Casimir attraction on the dynamic pull-in voltage are studied. It is found that the dispersion and centrifugal forces decrease the pull-in voltage of a nano-bridge. Dynamic response of the nano-bridge is investigated by plotting time history and phase portrait of the system. The validity of the proposed method is confirmed by comparing the results from the present study with the experimental and numerical results reported in the literature.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Non-Linear Mechanics - Volume 77, December 2015, Pages 96–106
نویسندگان
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