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FREE VIBRATIONS OF RING-STIFFENED SHELLS
GRUMMAN AIRCRAFT ENGINEERING CORP BETHPAGE N Y
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The modal method is used to obtain the free modes of vibration of ring-stiffened shells. The equations of motion of the ring reinforced shell are written in terms of the normal modes of the unstiffened shell. The stiffening rings are considered as displacement-dependent line-loads and enter the analysis in terms of their elastic properties. This procedure replaces the usual transcendental frequency equation by a more easily evaluated system of linear, algebraic, homogeneous equations. An arbitrary number of intermediate rings of unequal size and spacing may be accommodated. Author
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