Redesign of cylindrical shells by large admissible perturbations

Structural redesign is the process of finding a new design that satisfies a set of performance requirements starting from a poorly performing design. Structural redesign is formulated as a two-state problem where the baseline design exhibits undesirable response characteristics and the objective des ign satisfies the design requirements. A LargE Admissible Perturbations (LE AP) methodology is developed to formulate and solve the problem of structur al redesign of cylindrical shells for modal dynamics. First, the nonlinear perturbation equations of cylindrical shells for modal dynamics are derived relating the baseline to the unknown objective design. The redesign proble m is formulated as an optimization problem. Next, an algorithm is developed to solve the nonlinear problem and to identify a locally optimal design th at satisfies the given modal dynamics specifications. The developed LEAP al gorithm calculates incrementally without trial and error or the repetitive finite-element analyses the structural design variables of the objective de sign. Numerical applications of cylindrical shell redesign for modal requir ements are used to verify the methodology and test the algorithm. The devel oped methodology identifies incompatible frequency requirements where solut ions cannot be achieved. Further, systematic redesign applications show tha t even for strip uniform shells, modes are linked, making satisfaction of m ultiple frequency objectives impossible.