Mathematical model for cargo vessel design

Abstract

The article considers a mathematical model designed to automate calculations performed at the initial stages of designing marine cargo ships (tankers, bulk carriers, container ships and universal dry cargo ships). To determine the main dimensions and coefficients of completeness in the model, formulas are used, the results of a statistical analysis of the data of modern prototype ships. In the calculation of propulsion using the Holtrop method, the features of the contours and shape of the hull, the characteristics of the nasal bulb are taken into account. To determine the hydrodynamic and geometric characteristics of the propeller, approximating polynomials are used, obtained for the thrust and moment coefficients of propellers of the B-series. The characteristics of the main engine are selected according to a special algorithm from the database of marine diesel engines produced both in our country and abroad, created by the authors. The main indicators of stability and strength of the designed ships are calculated. The initial data are speed, carrying capacity and quantities characterizing the conditions for the design, construction and operation of ships. The results include the main dimensions and coefficients of completeness, displacement and load components, construction cost and economic indicators of functional efficiency. Functional efficiency and economic indicators are evaluated taking into account the design life of the vessel and inflation. The mathematical model is implemented as a computer program and can be used at the initial stages of design to automate calculations and express assessment of the characteristics, elements and economic efficiency of candidate ships for given lines of operation.