In this paper, natural frequency of completely fluid-filled composite circular cylindrical shells on Winkler and Pasternak elastic foundations are studied. The Dynamic Stiffness Method is employed to solve the cylindrical shell problem. Natural frequencies of fluid-filled cylindrical shells based on elastic foundations are evaluated. It is observed that frequencies are strongly affected when a cylindrical shell is attached with elastic foundations. This analysis can be extended to investigate the other aspects like buckling and dynamic response involving different types of materials used for cylindrical shells. | Nguyễn Văn Trang và Đtg Tạp chí KHOA HỌC & CÔNG NGHỆ 139(09): 115 - 119 NATURAL FREQUENCY OF FLUID -FILLED LAMINATED COMPOSITE CYLINDRICAL SHELLS ON ELASTIC FOUNDATIONS Nguyen Van Trang*, Duong Pham Tuong Minh College of Technology - TNU SUMMARY In this paper, natural frequency of completely fluid-filled composite circular cylindrical shells on Winkler and Pasternak elastic foundations are studied. The Dynamic Stiffness Method is employed to solve the cylindrical shell problem. Natural frequencies of fluid-filled cylindrical shells based on elastic foundations are evaluated. It is observed that frequencies are strongly affected when a cylindrical shell is attached with elastic foundations. This analysis can be extended to investigate the other aspects like buckling and dynamic response involving different types of materials used for cylindrical shells. Keywords: Natural frequency, Fluid-filled composite cylindrical shells, Dynamic Stiffness Method, Winkler and Pasternak Elastic foundations INTRODUCTION* Fluid-filled composite circular cylindrical shells on Winkler and Pasternak elastic foundations are popular structures in engineering applications including aeroplanes, ships and construction buildings. Lots of research, including theoretical, numerical and experimental studies have been carried out to investigate the dynamic performance of shells with different shapes and boundary conditions. Free vibration of a partially fluid-filled cross-ply laminated composite circular cylindrical shell is investigated by Xi et al. [1, 2] using a semianalytical finite element technique based on the Reissner–Mindlin theory and compressible fluid equations. Vibration analysis of thick axis-symmetric laminated composite shells on Winkler elastic foundation by Continuous Element Method was studied by Nguyen Manh Cuong, Tran Ich Thinh et al. [3]. The vibration analysis of laminated orthotropic shells with different boudary conditions and resting on elastic foundation was .
