VIBRATION OF OPEN CYLINDRICAL-SHELLS - A 3-DIMENSIONAL ELASTICITY APPROACH

The three-dimensional elastic analysis of the vibration of open cylind rical shells are presented. Transverse normal stress usually neglected in plate and shell higher-order theories has been considered. The nat ural frequencies and vibration mode shapes have been obtained via a th ree-dimensional displacement-based extremum energy principle. Excessiv e requirements for memory and computational effort have been overcome, without sacrificing numerical accuracy, by (i) decoupling the three-d imensional displacements into the product of a set of beam and shell s hape functions; and (ii) classifying the vibration modes. The effects of subtended angle and aspect ratio have been concluded for shells wit h various boundary conditions. Typical vibration mode shapes demonstra ting the dependence of vibration characteristics on boundary constrain ts are presented. (C) 1998 Acoustical Society of America. [S0001-4966( 98)01609-9]