DYNAMIC ANALYSIS OF STEPPED COMPOSITE CYLINDRICAL SHELLS RESTING ON PASTERNAK ELASTIC FOUNDATION BASED ON CONTINUOUS ELEMENT METHOD

Nam Bich Le, Cuong Manh Nguyen, Thinh Ich Tran

Abstract


This research presents a new continuous element model for solving vibration problems of stepped composite cylindrical shells resting on Winkler and Pasternak foundations with various boundary conditions.  Based on the First Shear Deformation Theory (FSDT), the equations of motion of the circular cylindrical shell are introduced and the dynamic stiffness matrix is obtained for each segment of uniform shell. The interesting assembly procedure of continous element method (CEM) is adopted to analyze the dynamic behavior of the multi-stepped composite cylindrical shell on elastic foundation. Free vibrations and harmonic responses of different configurations of stepped composite cylindrical shells on elastic foundation are examined. Effects of structural parameters, stepped thickness and elastic foundations on the free vibration responses of stepped composite cylindrical shells are also presented. Comparisons with previously published results and finite element (FE) analyses show that the proposed technique saves data storage volume and calculating time, is accurate and efficient for studying medium and high frequencies.

Keywords


Stepped shell, Vibration of cylindrical shell, Composite shell, elastic foundation, Winkler/ Pasternak foundation, Continuous Element Method, Dynamic Stiffness Method

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DOI: https://doi.org/10.15625/0866-7136/9832

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