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Oil Tanker Structure Node Design Improvement Based on CSR Fatigue Life Requirement

Author: ZuoRui
Tutor: JiZhuoShang
School: Dalian University of Technology
Course: Design and manufacture of ships and marine structures
Keywords: Common Structural Rules of double - hull oil tankers Typical Node Nominal stress method Fatigue resistance Fatigue life
CLC: U674.133.1
Type: Master's thesis
Year: 2009
Downloads: 87
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Abstract


International Association of Classification Societies in order to meet the industry , the shipping industry , \Double hull tankers Common Structural Rules (CSR) by Lloyd 's Register of Shipping (LR), American Bureau of Shipping (ABS) and Det Norske Veritas (DNV) , developed jointly . The new specification introduces the concept of today 's most cutting-edge design , extensive use of the latest scientific research , the fatigue life assessment is the new norms unified classification rules on the fatigue calculation standard , therefore , the fatigue life assessment study significant . Based theory to the CSR specification and fatigue strength , depth fatigue assessment methods in the new specification , the fatigue strength of checking for the structure of a typical node of the target ship . Hull structure cumulative fatigue damage calculation is based on the SN curve and Miner linear cumulative damage theory , the basis of the simplified method of fatigue assessment is the structure of long-term stress range distribution is assumed to be the synthesis of the Weibull distribution of stress range ; method main content : wave induced load calculation ; calculation of various stress components range ; synthesis of the stress range ; fatigue cumulative calculation of the degree of damage . Target ship 26,000 tons of double hull tankers as key nodes , nominal stress method for fatigue assessment calculations it , the side of the ship 's bilge , as well as the side and bottom of the boat access area to analyze the design and optimization of the design quality of the node reduce high stress , improve stress concentration to increase the hull structure fatigue resistance . Demonstrated through a series of calculations , compared the specific size of the nodes in the form of the nodes in the form of soft soft toe and back brackets and computational analysis on the basis of the nodes in the form of improved fatigue resistance positive significance. Finally, the results of this study are summarized on the ship fatigue resistance design of some of the conclusions and recommendations of the reference value . And look forward to the future in terms of nodes in the form of research direction and content.

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CLC: > Transportation > Waterway transport > Marine Engineering > Various types of vessels > Carriers > Cargo ship > Tankers > Tanker
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