Ship Theoretical Calculations

Ship Theoretical Calculations

Ship conceptual design focuses on determining the general characteristics and functions of the ship. At this stage, basic features such as the dimensions, type, function, payload capacity, speed, and range of the ship are determined. In addition, initial ideas are developed about the general layout, main machinery and systems of the ship.

The design process, which starts with the optimization of the ship’s form, covers all original calculations such as ship power analysis, initial intact & damage stability, longitudinal strength SF & BM and, continues with structural stress analysis of ships, vibration and noise analysis, modal analyses in dry and wet environments, in later stages.

Our ship theoretical calculations cover the following :

 Preliminary and final intact & damaged stability (Probabilistic and Deterministic)
 Longitudinal strength – Shear forces and Bending Moments
 Speed & Power calculations
 Freeboard and Tonnage
 Deadweight scale
 Ship hydrostatics
 Tank soundings
 Launching (40+ ships)

By performing stability and longitudinal strength calculations in sync with ship structural stress analysis, the possibility of a structural break in the ship due to the load taken by the ship is prevented. The accuracy and precision of structural stress analysis are closely related to the dimensions of the cells in the mesh system used in the calculations. The smaller cell size means the higher accuracy of the result.

We carry out computational fluid dynamics (CFD) and finite element analysis (FEA) studies with Siemens NASTRAN, Siemens STAR CCM+ and other equivalent powerful softwares, which is an indispensable program for research centers. We use Siemens SOLID EDGE Pro to model the 3D ship structural elements used in these calculations.

The sensitivity level of the mesh structure of the hull in computational fluid dynamics and finite element analysis has a great effect on the calculation results. Therefore, we prepare the mesh system at a higher fineness than the standard mesh size. In this method, the calculation time is extended significantly, but since a satisfactory level is reached in the results, we do not compromise on the accuracy of the convergence value.

Ship Theoretical Studies

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