Research & Development

Projet

MONAMOOR

Modelling and monitoring of polyamide mooring lines

Context

Mooring systems using polyamide ropes are a promising technical and economic solution for future floating wind farms. Polyamide lines can be used to reduce maximum tensions, absorb the loads transmitted to the float and reduce the footprint of the mooring on the ground. As the long-term behaviour of this type of synthetic fibre is not well known, its qualification for a period corresponding to that of the operation of a wind farm (20 to 25 years) is a major challenge.

Objective

To develop tools for modelling the mechanical behaviour of nylon fibre lines and appropriate long-term monitoring instruments, based on an in-depth understanding of degradation mechanisms

Main achievements

Improvement and validation of a nylon behaviour law established during a previous project (POLYAMOOR from 2017 to 2020)

Long-term laboratory creep tests

Fatigue tests, X-ray tomography analysis of ropes, use of the self-heating method

Development of a 3D mesoscale finite element model of a subrope

Raising the level of technological maturity of various innovative sensors: elongation (wire, ultrasound, fibre optics), pressure, acoustic emission

Design, assembly and deployment at sea of a demonstrator capable, on a reduced scale, of representing the forces generated by a floating wind turbine

Sea trials to validate the behaviour law and some of the sensors developed

Main outputs

Visco-elasto-plastic behaviour law validated, for a representative scale, with laboratory and sea trials
Creep curve developed with several years of data showing the validity of a prediction based on test results lasting a few hours
3D mesoscale finite element model of a subrope
Reliable acquisition and processing methodology for in-service monitoring
At sea demonstrator for testing mooring components and sensors in offshore conditions

Project sheet

Sea trials story

Final webinar

Rapports publics

Conclusion

POLYAMOOR and then MONAMOOR have led to significant advances in innovative mooring solutions. They confirmed that the lifespan of polyamide is compatible with that of a commercial farm. Robust modelling tools for the short- and long-term behaviour and fatigue of synthetic lines have been developed. A modelling law and innovative sensors were validated during sea trials.

Partners

This project was led by France Energies Marines and Ifremer.

Funding

This project received French State funding managed by the National Research Agency under the France 2030 investment plan (ANR-10-IEED-0006-34). It also received financial support from the Brittany, Pays de La Loire and SUD Provence-Alpes-Côte d’Azur regions.

Accreditation

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

MONAMOOR

Context

Objective

Main achievements

Improvement and validation of a nylon behaviour law established during a previous project (POLYAMOOR from 2017 to 2020)

Long-term laboratory creep tests

Fatigue tests, X-ray tomography analysis of ropes, use of the self-heating method

Development of a 3D mesoscale finite element model of a subrope

Raising the level of technological maturity of various innovative sensors: elongation (wire, ultrasound, fibre optics), pressure, acoustic emission

Design, assembly and deployment at sea of a demonstrator capable, on a reduced scale, of representing the forces generated by a floating wind turbine

Sea trials to validate the behaviour law and some of the sensors developed

Main outputs

Conclusion

Partners

Funding

Accreditation

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MONAMOOR

Context

Objective

Main achievements

Improvement and validation of a nylon behaviour law established during a previous project (POLYAMOOR from 2017 to 2020)

Long-term laboratory creep tests

Fatigue tests, X-ray tomography analysis of ropes, use of the self-heating method

Development of a 3D mesoscale finite element model of a subrope

Raising the level of technological maturity of various innovative sensors: elongation (wire, ultrasound, fibre optics), pressure, acoustic emission

Design, assembly and deployment at sea of a demonstrator capable, on a reduced scale, of representing the forces generated by a floating wind turbine

Sea trials to validate the behaviour law and some of the sensors developed

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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