The Study Of Ship Structure FEA Auto-loading Technique

Structure analysis of whole hull can simulate the real load ,reduce man-made influence of result caused by boundary conditions. It is a more accurate analysis. With the development of ship industry, the FEA applied in ship structure is more complex. The techniques of auto-loading includes: water pressure on hull, balancing on model, and automatic distributing load on nodes. In this paper, an analysis is made in this field. The following is the main works of the paper.1) The weight and the center of weight of the whole hull, analysis by statics the weight of steel, the equipment, oil, water, crew and cargoes etc., conclude a method of calculating the weight and the center of weight of the whole hull,2) Work out the series of formula of distributing the water pressure of wave to the corresponding nodes on the plate, conclude a method of calculating the flotage and the center of the flotage,3) Analysis the method of adjusting the equilibrium of the hull, the finite element module of the hull, and the character of the linetype, by ship statics principle, work out a series of formula of adjusting longitudinal slant, preliminarily confirm the parameter and the range,4) Program in FORTRAN, and link into ANSYS, for auto-loading when analyzing the whole hull by the FEA,5) Make the finite element module of a real hull, calculate the weight and the center of the weight, the flotage and the center of the flotage, compare the result of manual calculation with the computed result, analysis the deviation of the program.The formula, the way and the program of auto-loading can be used for FEA the whole hull. This may serves a basis for further study.