کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
824806 1469985 2014 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Size-dependent vibration analysis of a microbeam in flow based on modified couple stress theory
ترجمه فارسی عنوان
تجزیه و تحلیل ارتعاش وابسته به اندازه یک میکروبروم در جریان بر اساس نظریه تنش اصلاح زنانه
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
چکیده انگلیسی

This paper develops and analyzes a theoretical model for flexural vibrations of microbeams in flow with clamped–clamped ends. Based on a modified couple stress theory and the Hamilton’s principle, the governing equations for three-dimensional vibration of a curved microbeam are derived with the consideration of the fluid force induced by external flow. Meanwhile, as a special case, the reduced equation for a straight microbeam in flow is obtained. This new theoretical model contains a material length scale parameter that can capture the size effect. The differential quadrature method (DQM) is introduced to formulate the discrete forms of the governing equations. Based on the numerical calculations, the effects of several system parameters, i.e. the open angle, the characteristic size of the microbeam and the flow velocity, on the natural frequencies and stability of the system are discussed. The results show that, with a sufficiently high flow velocity, the static buckling instability may occur for both curved and straight microbeams in flow, which should be considered in the design and applications. Furthermore, the size effect on the vibration properties is significant when the characteristic size of the microbeam is comparable to the internal material length scale parameter.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Engineering Science - Volume 85, December 2014, Pages 20–30
نویسندگان
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