Abstract
A pro-active safety management system for ship structures that quantifies the aging effect such as by fatigue and corrosion on the ship's structural integrity is proposed as a new approach to the ship's structural surveys that have conventionally been made according to a more passive management system. Some of the authors have developed a compact fatigue damage sensor that can detect accumulated fatigue damage in welded structures by attachment to the member and inspection after a certain period. The authors have applied this sensor to the hull structures of an LNG carrier for experimental purposes, ascertained its long-term durability under the severe environment to which the ship was exposed and obtained quantitative data on the accumulated fatigue damage. In this paper, the authors propose a fatigue management system using this sensor called the Hull Aging Management System and propose it as a pro-active safety management system for LNG carrier hull structural aging and introduce a method to improve the accuracy of accumulated fatigue damage detection by using this sensor.
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