Research & Development

Project

OMDYN2

Dynamic umbilicals for floating marine renewable energies technologies – Phase 2

Context

Dynamic power cables have been clearly identified as critical components for floating ORE systems. High voltage alternative current cables, known as HVAC, for floating wind turbines are the main concern at this stage. One of the challenges for the French industry is to identify the need to build, or adapt, a test bench that would account for the inherent coupling between the mechanical, electrical and thermal stresses involved.

Objective

To experimentally characterise and then model the multiphysical stresses experienced by dynamic cables and propose a methodology for monitoring them in service

Main achievements

Characterisation of the mechanical behaviour of a dynamic cable as a function of temperature rise

Development of a local analytical cable section model and definition of global parameters for ensemble models

Implementation and calibration of a finite element volume model and inter-component friction model

Realisation of innovative tank tests at scale 1 of a cable colonized by mussels obtained by 3D printing

Proof of feasibility of curvature measurements using optical communication fibre, identification of conditions for measuring internal stresses by optical fibre

Main outputs

Database of bending stiffness of a dynamic cable as a function of temperature
2D cross-section design software for fatigue calculation in copper armour and components
Automatic meshing module with graphical interface and definition of a 3D finite element dynamic cable model: translation of material properties, periodicity criteria, creation of boundary conditions
Unique database of hydrodynamic efforts representative of mussel colonisation
Laboratory tests identifying suitable optical measurement processes and measurable curvature ranges and interrogation distances

Fact sheet

Didactic video

Webinaire

Rapports publics

Conclusion

OMDYN2 has made it possible to clarify the complexity of a dynamic multi-material cable under multiphysical stresses. Initial numerical models calibrated on tests have provided a better understanding of these interactions. The calculation of fatigue in armouring and conductors is now relatively reliable, but there is still work to be done on the life of conductors and insulators. The novel and realistic hydrodynamic tests of mussel colonisation indicate higher stresses than those described in the literature. Promising avenues for in-service fibre optic monitoring have also been identified.

Partners

This project was led by Ecole Centrale de Nantes and France Energies Marines.

Funding

This project received French State funding managed by the National Research Agency under the Investments for the Future Programme (ANR-10-IEED-0006-28).

Accreditation

This project was certified by the maritime clusters Pôle Mer Bretagne Atlantique and Pôle Mer Méditerranée.

OMDYN2

Context

Objective

Main achievements

Characterisation of the mechanical behaviour of a dynamic cable as a function of temperature rise

Development of a local analytical cable section model and definition of global parameters for ensemble models

Implementation and calibration of a finite element volume model and inter-component friction model

Realisation of innovative tank tests at scale 1 of a cable colonized by mussels obtained by 3D printing

Proof of feasibility of curvature measurements using optical communication fibre, identification of conditions for measuring internal stresses by optical fibre

Main outputs

Conclusion

Partners

Funding

Accreditation

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OMDYN2

Context

Objective

Main achievements

Characterisation of the mechanical behaviour of a dynamic cable as a function of temperature rise

Development of a local analytical cable section model and definition of global parameters for ensemble models

Implementation and calibration of a finite element volume model and inter-component friction model

Realisation of innovative tank tests at scale 1 of a cable colonized by mussels obtained by 3D printing

Proof of feasibility of curvature measurements using optical communication fibre, identification of conditions for measuring internal stresses by optical fibre

Main outputs

Conclusion

Partners

Funding

Accreditation

Pour aller plus loin

Ajoutez votre titre ici

Ajoutez votre titre ici

Ajoutez votre titre ici

Would you like to know more ?

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