Quasi-dynamic global strength analysis of a passenger ship in regular waves

Nikita Dementyev (Speaker), Markus Jokinen (Contributor), Antti Yrjanainen (Contributor), Lakshmynarayanana, P. (Contributor), Hirdaris, S. (Contributor)

Activity: Talk or presentation typesConference presentation

Description

The current boom in cruise and passenger ship markets has led to corresponding increase in the size of ships and their structural complexity. The optimization of capital expenditure costs remains a critical part in the design and construction of such ships. Additionally, to ensure sufficient functional safety margins the designers have at their disposal state-of-the-art tools and rational design methods for design and structural strength assessment especially for ships with general particulars and structural features that are not covered by the existing empirical Classification Rules.

This paresentation presents a rational quasi-dynamic response approach for the evaluation of global loads of passenger vessels. The method couples wave-induced hydrodynamic pressures with a rigid hull idealization performed with ANSYS AQWA and ANSYS SpaceClaim. The CAD structural model of a typical cruise ship was produced using CADMATIC Hull with basic design accuracy. NAPA software was used for evaluating the still water bending moment. Consequently, the 3D diffraction/radiation panel code ANSYS AQWA was used to define the wave pressures acting on the hull and loads were mapped on the hull surface and transferred to the ANSYS FEM solver for hydro-structure coupling.

Comparisons against Class Society Rule wave bending moment and shear forces amidships demonstrates that the direct evaluation of the wave bending moment and shear force envelopes along the hull girder may be a preferred approach in terms of assuring global structural strength and optimizing total steel weight.
Period24 Sep 2019
Event titleThe Baltic Seas International Maritime Conference: European Maritime Research from Adriatic to Baltic
Event typeConference
LocationTurku, Finland
Degree of RecognitionInternational

Keywords

  • Passenger ships
  • Ship global loads
  • Quasi-dynamic response
  • FEA
  • Ship hydrodynamics