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The United States Coast Guard (USCG) has contracted MARIN to carry out Fatigue Structural Maintenance Validation Work on a Coast Guard Cutter. The goal is to further improve understanding of the fatigue life, to increase the confidence level in predicting the fatigue life and to forecast structural maintenance needs of Coast Guard Cutters.
BACKGROUND
The United States Coast Guard (USCG) has contracted MARIN to carry out fatigue structural maintenance validation work on a Coast Guard Cutter. In order to assure the best possible result in terms of technical achievement MARIN has involved other organizations in the project. For this reason MARIN has organised the Valid joint industry project (Valid JIP). Within the USCG the project has become known as the fatigue life assessment project (FLAP). The goals of the work are to forecast structural maintenance needs of USCG Cutters, further improve the understanding of wave loading leading to fatigue damage, and increase the confidence level in predicting wave loading leading to fatigue damage.
SCOPE OF WORK
The above mentioned goals will be achieved based on the following scope of work.
Task 1 – Preparation
This task includes the development of a detailed project plan and the management duties for the project. The plan includes conducting dedicated and long-term trials on a Coast Guard Cutter, conducting a model test program, and the validation of fatigue assessment tools.
Task 2 – Trials and Monitoring campaign
Conduct the dedicated trials and the follow-on monitoring campaign. Trials will provide data for correlation with model experiments. Long-term monitoring data will allow for ultimate validation of the fatigue life prediction methodologies. Furthermore, the information will support future fatigue analysis and predictions, after prediction programs have been updated and validated against the model test results.
Task 3 – Model testing
The primary purpose of this task is to provide extensive information on hydrodynamic loading affecting fatigue lifetime in controlled sea conditions. This information will be correlated with full-scale trials and will be used to validate computational methods.
Task 4 – Validation
Fatigue assessment related programs will be validated and possibly updated initially after the completion of the model testing and finally based on the results of the monitoring campaign. Information will be supplied to project participants for the validation and updating their own fatigue prediction programs.
An extensive structural monitoring campaign will be conducted on a new Coast Guard Cutter.
Task 1 – Preparation
This task includes the development of a detailed project plan and the management duties for the project. The plan includes conducting dedicated and long-term trials on a Coast Guard Cutter, conducting a model test program, and the validation of fatigue assessment tools.
Task 2 – Trials and Monitoring campaign
Conduct the dedicated trials and the follow-on monitoring campaign. Trials will provide data for correlation with model experiments. Long-term monitoring data will allow for ultimate validation of the fatigue life prediction methodologies. Furthermore, the information will support future fatigue analysis and predictions, after prediction programs have been updated and validated against the model test results.
Task 3 – Model testing
The primary purpose of this task is to provide extensive information on hydrodynamic loading affecting fatigue lifetime in controlled sea conditions. This information will be correlated with full-scale trials and will be used to validate computational methods.
Task 4 – Validation
Fatigue assessment related programs will be validated and possibly updated initially after the completion of the model testing and finally based on the results of the monitoring campaign. Information will be supplied to project participants for the validation and updating their own fatigue prediction programs.
An extensive structural monitoring campaign will be conducted on a new Coast Guard Cutter.
Contact
Ingo Drummen
Teamleader Hydro-Structural Services
BENEFITS
The main benefits for participants are:
- Insight into the physics and operational factors that govern fatigue damage
- Data from sea trials and model testing to validate own tools
- Detailed insight into validity of contemporary concepts/tools
PARTICIPANTS
USCG, American Bureau of Shipping, BAE SYSTEMS, Bassin D'Essais des Carenes, Bureau Veritas, Defence R&D Canada, Lloyd’s Register, Northrop Grumman, Schelde Naval Shipbuilding and MARIN are confirmed participants in the project.
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