Wave localization on a submerged cylindrical shell with rib aperiodicity

results of a numerical study of vibration localization due to stiffener var iability in a framed shell are reported. An axisymmetric finite element (FE )-infinite element model is used to obtain predictions in good general agre ement with previously reported experimental results. Over the frequency ban d of this study, up to three times the ring frequency, two structural reson ances dominate the vibratory response of the shell for high circumferential orders (n>10). Localization is shown to be linked to the sensitivity of th e local resonance frequencies of the system to specific geometrical paramet ers. Specifically, rib thickness variations strongly affect the first pass band, while rib spacing variations strongly affect the second pass band.