Abstract
This chapter provides an overview of two probabilistic analysis and design tools. SIMLAB and PULSTR, along with their applications to surface ships subjected to both extreme dynamic and seaway loading. To perform the probabilistic vulnerability assessment of surface ships under extreme dynamic loads, a stochastic finite element tool, SIMLAB was developed by integrating the nonlinear finite element code, DYNA3D, into a simulation based probabilistic analysis framework. SIMLAB can provide probabilistic failure prediction of a structural system characterized by both random variables and random processes. PULSTR is used to perform a reliability-based assessment of a surface ship structure at its preliminary design/analysis stage. The uncertainties associated with global hull geometo, panels, hard corners, stiffeners, and material properties are propagated into the hull ultimate strength prediction module. To demonstrate these analysis tools, SIMLAB is applied to an elastoplastic beam model subjected to a random excitation, and PULSTR is employed for the reliability assessment of a surface ship under its single and double hull configurations. A hybrid approach Monte Carlo Simulation/first order reliability analysis module (MCS/FORM) is developed to compute small probability of failure with a great computational efficiency and numerical accuracy.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call