A finite element code is developed for analyzing the free vibration characteristics of a stiffened conoidal shell by combining an eight noded curved shell element with a three noded curved beam element. The code is validated by solving problems available in the literature and comparing the present results with established ones. A number of problems are further solved where the size of the cutouts and their positions with respect to the shell centre are varied for different edge constraints of full and truncated conoids. The effects of these parametric variations on the fundamental frequencies are studied and discussed in details. The results are furnished as figures and tables, which may be readily used by practicing engineers dealing with stiffened conoids with cutouts central or eccentric.
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Hota et al. (2007) studied this question.
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