Integrated Life-Cycle Framework for Maintenance, Monitoring and Reliability of Naval Ship Structures

Abstract : The proper life-cycle management of naval ship structures under uncertainty is best conducted through an integrated and well-coordinated life-cycle framework. This framework can support the rational decision making process and help the planning for future inspection, monitoring, and/or maintenance actions. Additionally, the framework should be capable of modeling the continuous performance deterioration of naval ship structures that occurs due to aging effects as well as different environmental and mechanical Stressors. Accordingly, this research project, sponsored by the U.S. Office of Naval Research, was conducted at Lehigh University to build a framework for the probabilistic analysis of ship structures in terms of reliability, redundancy, fatigue, material deterioration, damage detection, monitoring, and inspection optimization. The work on this project began on August 1st, 2008 with an intensive literature review and study of the topics related to the performance assessment and monitoring of ship structures. Topics related to ultimate bending strength and fatigue have been covered in this review-study process. Next, the acquired concepts have been investigated, put at work, and new developments have been accomplished. Research work has been performed on four fronts: 1- Bending ultimate strength reliability and monitoring 2- Fatigue reliability and monitoring 3- Cost-effective monitoring planning under uncertainty 4- Optimization of monitoring and inspection strategies.

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