Method And System For Fatigue-Monitoring Of A Submarine Cable In Off-Shore Operations
AssigneeNKT HV Cables AB
InventorAndreas Tyrberg
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Abstract
A method for fatigue-monitoring of a submarine cable during off-shore jointing or reparation includes: a) determining a plurality of curvature values concerning a curvature of the submarine cable at different points in time during the off-shore jointing or reparation, b) determining a plurality of strain ranges of the submarine cable based on the plurality of curvature values, and c) determining a fatigue damage of the submarine cable based on the plurality of strain ranges.
Claims20
A method for fatigue-monitoring of a submarine power cable during off-shore jointing or reparation, the method comprising:
- a) determining a plurality of curvature values concerning a curvature of the submarine power cable at different points in time during the off-shore jointing or reparation,
- b) determining a plurality of strain ranges of the submarine power cable based on the plurality of curvature values,
- wherein in step b) the determining of each strain range involves using a mathematical model of the submarine power cable, the plurality of strain ranges relating to the strain in a lead sheath of the submarine power cable for different strain cycles or to the strain in another metallic component of the submarine power cable, and
- c) determining a fatigue damage of the submarine power cable based on the plurality of strain ranges,
- wherein step b) comprises determining a number of occurrences of each strain range, wherein in step c) the fatigue damage is determined based on the number of occurrences of each strain range.
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A computer program comprising computer code which when executed by processing circuitry of a system causes the system to perform a method for fatigue-monitoring of a submarine power cable during off-shore jointing or reparation, the method includes:
- a) determining a plurality of curvature values concerning a curvature of the submarine power cable at different points in time during the off-shore jointing or reparation,
- b) determining a plurality of strain ranges of the submarine power cable based on the plurality of curvature values,
- wherein in step b) the determining of each strain range involves using a mathematical model of the submarine power cable, the plurality of strain ranges relating to the strain in a lead sheath of the submarine power cable for different strain cycles or to the strain in another metallic component of the submarine power cables, and
- c) determining a fatigue damage of the submarine power cable based on the plurality of strain ranges,
- wherein step b) comprises determining a number of occurrences of each strain range, wherein in step c) the fatigue damage is determined based on the number of occurrences of each strain range.
A system for fatigue-monitoring of a submarine power cable during off-shore jointing or reparation, the system comprising:
- a curvature monitoring device configured to provide a measure of a curvature of the submarine power cable,
- a storage medium comprising computer code, and
- processing circuitry which when executing the computer code causes the system to perform steps of:
- a) determining a plurality of curvature values concerning a curvature of the submarine power cable at different points in time during the off-shore jointing or reparation,
- b) determining a plurality of strain ranges of the submarine power cable based on the plurality of curvature values,
- wherein in step b) the determining of each strain range involves using a mathematical model of the submarine power cable, the plurality of strain ranges relating to the strain in a lead sheath of the submarine power cable for different strain cycles or to the strain in another metallic component of the submarine power cable, and
- c) determining a fatigue damage of the submarine power cable based on the plurality of strain ranges,
- wherein step b) comprises determining a number of occurrences of each strain range, wherein in step c) the fatigue damage is determined based on the number of occurrences of each strain range.
The system comprises inclination sensors configured to be mounted on the submarine power cable, said inclination sensors are configured to provide a measure of a curvature of the submarine power cable.
Dependencies are inferred from the claim text.