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Time-variant Reliability Analysis of Ship Structure

Author: ShiXingHua
Tutor: WangShan
School: Harbin Engineering University
Course: Structural Engineering
Keywords: fatigue corrosion random process time-variant reliability
CLC: U661.4
Type: Master's thesis
Year: 2007
Downloads: 161
Quote: 2
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Abstract


Recently, the research of structural reliability had been rapidly developed, which was becoming one of the main research redirections of solid mechanics. The structural reliability was a series of new concepts, theories, methods and scale standards based on the probability, which considered many uncertain factor of structure. So it could give the assessment of the structure safety.The method of structure reliability at present was calculated based on the structure static model in which the strength and loads of structure was assumed to be invariant with time. In this method that was called time-invariant reliability method, using the extremum analysis, the probability density function of the strength and loads was achieved which could be used to do the reliability assessment. However, because of the certain environment of the structure, the strength and loads of structure would change with time. So the distribution of the strength and loads must be described by the random process. The reliability in which the limit state function would include random process was the time-variant reliability analysis.In this paper, based on the characteristics of loading condition of ship structure in service and the degeneration of the strength under fatigue and corrosion, the random time-variant model of ship hull section modulus was firstly set up using the theory of random process. Then the time-variant reliability was analyzed with the method of up-crossing analysis and parallel system reliability. This method could solve the problem of time-variant reliability.This method could not only present successive decrease of reliability of the ship structure under fatigue and corrosion, but also avoid the complicated numerical integration. It could be seen that this method was easy to achieve. Furthermore, the time-variant reliability was compared with the annual instantaneous reliability through an example, which indicated that this method was more precise, and could provide some references to the decision-making of the reliability, maintenance and safeguard.

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CLC: > Transportation > Waterway transport > Marine Engineering > Ship Principle > Ship structural mechanics
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