FRANCE ENERGIES MARINES (FEM), the national research institute dedicated to Offshore Renewable Energy (ORE), supports the nascent ORE industrial sector with the means and skills that increase competitiveness by mutualizing R&D costs, reducing risks and accelerating the acquisition of data and knowledge. FEM activities are founded on Research and Development projects based on a broad public-private partnership involving large groups, SMEs, regional authorities, advanced research and training institutions and competitiveness clusters, and with the support of the national Investing for the Future program. FEM collaborators are scientifically and technically involved in these projects thanks to their high level of scientific expertise. The headquarters of FEM are located in Plouzané (Brest area), France.
Description du poste
Monamoor Project summary
The project is the second phase of a study involving academic research institutes, an SME developing instrumentation, a rope supplier, a certification society and a floating wind platform designer to improve the reliability of station keeping of floating offshore wind turbines. First the project will develop in parallel modelling tools for the mechanical behavior and long-term durability of nylon fiber rope moorings, and the monitoring instruments which will allow their in-service response to be assessed. These two aspects are critical to optimize the mooring system. They will then be evaluated by instrumented tests on a moored buoy at sea. The present project will extend the TRL4 reached by the previous POLYAMOOR project up to TRL7, thanks to results from a sea-trial demonstrator equipped with innovative sensors developed for in-service measurements. In parallel, this project will adapt the global mooring health monitoring strategy developed in the MHM-EMR project to this specific material.
Main objectives of the PhD study
Nylon rope behavior law development and validation
Two nylon rope behavior laws have to be developed, identified and validated by comparison with experimental test results. The test facilities of IFREMER and ENSTA are available for this activity, together with technician support.
Meso-FE model development and validation
A meso-FE model has to be implemented into the FEM commercial software tool Abaqus, under finite deformation. Its parameters at the yarn scale have to be identified by dedicated experimental test devices. These devices have to be developed. This model has to be numerically simulated in the particular case of the Monamoor nylon rope construction. A dedicated tensile test on 4-tons nylon rope has to be conducted for the comparison with the meso-FE model predictions.