Structual Optimize Design For Cargo Tank Region Of Oil Tankers Based On Common Structural Rules

Suround the characteristics of Common Structural Rules(CSR), and the huge variety that brings to the oil tankers structure design, discusses at the precondition of how apply optimization method to attain the request of strength, gains the purpose of that make the midship section conFig.uration of tank ship has the most light weight.Complete the load calculation of the CSR core contents. Form the midship section conFig.uration optimization design programming system, which base on CSR. Emphasized a simple and practical characteristics, raise the degree of the automation, using the part of load calculation and the scantling that confirms with local strength condition to compare mutually with engineered software of RulesCalc 2006.3 and CCS_JBP_JTP_DSA₂006,the result is consistent. And aim at the common blemish of above-mentioned two greatest software's—just carry on a calibration of import scantling, but can't compute to get the end component size directly. This text set out from the norm compute of core contents, adopt Visual Basic programming language, resolved this problem by the root. But because of time and personal ability reason, at presentcarry out to satisfy longitudinal bending strength condition, part strength condition, rigidity and proportion of principal dimensions, the minimum area of midship section ect design functions. The stipulation conditions such as crook and fatigue etchave not embodiment in the programme.According to the CSR provision, extent more than 150 meters' oil ships need finite element intensive analysis and calibration. This literary adopt currency finite element analysis software MSC.Patran and MSC.Nastran, making the cargo bay area finite element analysis to a finished product oil/crude tankers of 50000 DWT, check yield strength, crooked strength, tired strength, extreme limit strength, the part yield gridding thinning analysis, open the bore processing contents. Mainly carried on the analytical and calibration of the tired strength. Analysis from fatigue crack mechanism of the generation and structural conFig.uration, node form that influence tired crack create and expand. When tired strength the dissatisfied code requirement, through the improvement of the structure ,or at inside of the scale board and the base cabin inclined plank elbow plank that increase appropriate size, the elbow knothole dimensional change influence of the tired strength. All of them have a detailed discuss in this paper.