Vibration of thin rotating cylindrical shells

• Main Author: Koh, Raymond Eng Seng.
• Other Authors: Ng Teng Yong
• Format: Final Year Project
• Language: English
• Published: 2011
• Subjects: DRNTU::Engineering::Mechanical engineering::Mechanics and dynamics
• Online Access: http://hdl.handle.net/10356/45093
• Institution: Nanyang Technological University

Cylindrical shells are widely used in many engineering applications today, and this project examines the characteristics of the cylindrical shells rotating about their longitudinal axis. Using Love-Kirchhoff hypothesis, with the inclusion of Coriolis and centrifugal forces which are present during rotation, the equations of motion are formulated for thin isotropic cylindrical shells. Beam functions are used as the displacement functions of the shells with the following four boundary conditions, simply supported-simply supported (SS-SS), clamped-clamped (C-C), clamped-simply supported (C-SS) and free-free (F-F). The result is then combined with Galerkin’s method to solve for the natural frequencies of the shell. The frequency characteristics of the shells of different boundary conditions, rotation speeds, and several geometrical parameters are investigated. In addition, the parameters affecting the critical rotation speeds at which the shells will buckle are also examined.