Free vibration of ring-stiffened cylindrical shells

✍ Scribed by A.M.J. Al-Najafi; G.B. Warburton

• Publisher: Elsevier Science
• Year: 1970
• Tongue: English
• Weight: 928 KB
• Volume: 13
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1016/s0022-460x(70)80076-1

✦ Synopsis

The finite element method, using axisymmetric elements, is used to investigate the natural frequencies and mode shapes of thin circular cylindrical shells with stiffening rings. Each stiffening ring is treated as a discrete element. The method has the advantage over most approximate analyses of being applicable to any shell and ring configur.afion. By comparison with new and previously published experimental results and with the few available exact theoretical results, it is shown that natural frequencies can be determined with adequate accuracy; furthermore in some circumstances the finite element method can lead to frequencies of considerably improved accuracy compared to those from the Rayleigh-Ritz method. The nodal patterns show wide variations, some being similar to those for the corresponding shell with no stiffeners and others showing markedly the influence of inter-ring deformation. The conditions under which the latter occurs are discussed in detail.