Al-Qadisiyah Journal for Engineering Sciences

EFFECT OF STIFFENERS AND THICKNESS OF SHELL ON THE NATURAL FREQUENCIES AND MODE SHAPES OF OBLATE SHELL BY FINITE ELEMENT METHOD

Authors

Kadhim Mijbel Mashloosh
Asma Hassan Ismail
Hani Aziz Ameen
Abstract
This paper discuss the natural frequencies and modes shapes of oblate shells by finite element method via ANSYS12 package with and without longitudinal and lateral stiffeners. Different types of elements are considered using three dimensional analysis with APDL program to take the variables of shell’s thickness, number of stiffeners and size of stiffeners. The obtained results reported the tenth structural natural frequencies and mode shapes which are based upon the behavior of the shell, it can be shown that the natural frequency of the oblate shell increased with increasing the mode number and the amplitude decreasing as increasing the thickness of shell.

Keywords

vibration
Natural Frequency
Mode Shape
ANSYS
Finite element method
Al-Qadisiyah Journal for Engineering Sciences
Volume 5, Issue 3
Summer 2012
Pages 325-340

  • Receive Date 01 September 2012
  • Revise Date 20 September 2012
  • Accept Date 25 September 2012

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