A posteriori initial imperfection identification in shell buckling problems

An overview of buckling and ultimate strength of spherical pressure hull under external pressure

“…Stull et al [45] presented a method that employs sparse sensor telemetry, acquired during a safe service loading condition, for use in the solution of an inverse problem that characterizes the actual, and previously unknown, imperfection field in a shell structure. This a posteriori determination of the shell initial imperfection field is then used to make strength predictions regarding the shell structure in question.…”

Model-based structural health monitoring of naval ship hulls

“…In this spirit, a ''divide-and-conquer'' scheme [50] is also adopted in the present work; a schematic of this process is given in Fig. 7.…”

“…(10). In addition to adopting a rather intuitive solution scheme, GAs are also well-suited to problems which exhibit complicated objective functional(s): a common issue when dealing with model-based SHM formulations [50]. Such objective functionals are often of a non-convex nature [48], thus eliminating the more efficient gradient-based solvers from consideration, due to their inability to negotiate solution spaces containing multiple local minima [51,52].…”

Stochastic identification of the structural damage condition of a ship bow section under model uncertainty

“…We require a way to parametrize forms of the hull damage. A natural approach for modeling such damage is via Gaussian Radial Basis Functions (RBFs) (Stull et al, 2008). The denting damage field is thus modeled as…”