A pro-active safety management system for ship structures that quantifies the aging effect such as fatigue and corrosion on ship structural integrity is proposed as a new approach to the ship's structural surveys that have conventionally been done according to a more passive management system. In a proposed fatigue management system called the HFMS (hull fatigue management system) using FDSs (fatigue damage sensors), it is an important problem to improve the prediction accuracy of hull fatigue life using the FDSs. The characteristics of the FDSs that are in use for fatigue life evaluation by monitoring structural members in ship structures are discussed in order to improve the prediction accuracy of fatigue life exposed to random wave loads such as storms under various loading conditions peculiar to ship structures. Factors affected by random loading against constant-amplitude loading and mean stress levels are introduced for the evaluation procedure using FDSs and confirmed by a series of fatigue testing and numerical simulations. This newly proposed fatigue life evaluation procedure using obtained factors is checked by comparison results of fatigue tests for a large structural model on which FDSs and strain gauges are provided simultaneously and to which random loads by assumption of storm patterns are applied under various mean stress levels. Practical application results of the FDS for an liquified natural gas carrier for 5-year operation are discussed.
A study on the improvement of prediction accuracy of hull fatigue life using a fatigue damage sensor
Eine Untersuchung zur Verbesserung der Vorhersagegenauigkeit der Ermüdungslebensdauer von Schiffskörpern unter Verwendung von Sensoren für Ermüdungsschäden
2009
7 Seiten, 12 Quellen
Conference paper
Storage medium
English
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