This poster was produced with inputs of the MUSCAS research project, MUlti-SCAle Stochastic computation for MRE, conducted by the University of Nantes.
Bio-colonisation is shown to affect the ageing of materials and the behaviour of offshore structures. It was recognized in the 70’s that bio-colonisation might change the loading due to hydrodynamic and mass effects. Mooring systems and umbilicals belong to a family of components sensitive to biocolonisation, which is therefore impacting their lifetime. However, marine growth is a stochastic process with time and space which is hard to predict without previous knowledge and environmental parameters. Our purpose is then to quantify, when it is possible, parameters of bio-colonisation all along the lifetime in order to reduce uncertainties on long term fatigue damages.
The poster is presenting a methodology which consists of updating an ‘a priori’ spatial model for biocolonisation by combining tension measurements in mooring lines with environmental parameters measurements during a Qualifying Sea State and solving an inverse problem. Thanks to this mechanical engineering monitoring of marine growth, temporal models are made more accurate and through time-dependent reliability analysis, mooring lines maintenance can be improved.
The MUSCAS project was carried out within the framework of the WEAMEC, and with funding from Pays de la Loire Region, by Nantes University.