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      • 24th French congress of mechanics : focus on sea

      • From 26 to 30 August 2019, Brest hosted the 24th French Congress of Mechanics (CFM), which brought together more than 1,000 participants at the Faculty of Science and Technology of the UBO. A first in Brittany!
      • attendees at the Congress in Brest © IRDL
        © IRDL

        Supported by the Association Française de Mécanique (AFM), the event was organized by the Institut de Recherche Dupuy-de-Lôme (IRDL).

        Campus mondial de la mer was present with a stand highlighting the actors of its community and the partners of the event: IRDL, École Navale, ENIB, ENSTA Bretagne, France Énergies Marines, Ifremer, ISBlue, IUT Brest Morlaix, UBO and UBS.

        Address all aspects of mechanics and highlight major innovations

        Every two years, the CFM provides an opportunity to review the progress of research in fluid and solid mechanics, for applications in mechanical, electrical and civil engineering, materials and acoustics. "In each field of research, there are major developments" says Sylvain Calloch, Deputy Director of the IRDL.

        Conference at the Congress © ENSTA Bretagne
        © ENSTA Bretagne

        In the digital field, for example, there is more and more talk of model reduction. "Computing power increases year after year, but we have so much data that we no longer know what to do with it," explains Sylvain Calloch. "Model reduction makes it possible to obtain the most accurate results."

        Another example in experimental mechanics is the contribution of field measurements by optical or infrared camera. "It changes the way we conduct the tests and process the results" says Sylvain Calloch.

        Mohamed Benbouzid, University Professor and Director of the UBO site at the IRDL, is working on electricity generation from marine renewable energies. The two main challenges in this area are the optimization of electricity generation (efficiency) but also resilience. The latter concept aims to "find solutions so that a system can tolerate failures and continue to operate until the next maintenance, even if damaged" explains Mohamed Benbouzid. This work in mechatronics and robotics was discussed in a session of the CFM. A thesis in co-supervision between the IRDL/UBO and the University of Campinas (Brazil) on the video inspection of hydro turbines by an autonomous underwater vehicle will be defended next December.

        The sea as a field of application

        Organized in Brest, addressing the applications of mechanics to the marine world was an obvious choice with topics covering renewable marine energies, naval and nautical (including sailing propulsion and hydrofoils), ocean hydrodynamics, underwater robotics...

        "Corrosion causing early ageing of structures is one of the specificities of the marine world" explains Sylvain Calloch. "Building a racing boat requires the use of high-performance composites, whose behaviour must be studied. In shipbuilding, it is necessary to take into account the longevity of the ships (about 40 years) and do everything possible to limit maintenance costs and ensure service life. And all this is on a case-by-case basis, because boats are not built in series, as in the automobile industry".

        Présentation au Congrès français de mécanique 2019

        The participants of the congress, most of whom do not work in the field of the sea, were made aware of the theme through plenary and semi-plenary sessions. Examples include the plenary session of Eric Papin, Naval Group, on "Materials: a major challenge for current and future naval systems", and that of François Bellec, Musée National de la Marine, on the history of the Lapérouse expedition and the importance of measuring instruments. Jean-François Filipot, France Énergies Marines, presented a semi-plenary session on "the observation of giant breakers and their impact on structures at sea: lessons learned from a measurement campaign from the Mare's lighthouse". "Design and sizing of competition sailing yachts" was also the subject developed by GSea Design of Lorient.

        The theme of renewable marine energies has also been well developed, in particular by France Energies Marines. During a semi-plenary session, Jean-François Filipot, Scientific and Technical Director, presented a campaign of breakwater measurements carried out from the lighthouse of La Jument, off the island of Ushant. The objective of such a study is to evaluate the impacts of these giant waves on offshore structures such as wind turbines. Jean-François Filipot then led a session dedicated to mechanics for renewable energies. For his part, Antoine Maison, structural computation engineer, presented a study on the modelling of the stability of hydroelectric power cables on the bottom, in areas of high currents.

        In addition, marine applications were regularly discussed during the 35 sessions of the Congress.

        A French congress with an international dimension

        Stands au Congrès français de mécanique 2019

        Bringing together delegates from 16 different countries, the congress was international in character. Among the most represented countries: Algeria, Morocco and Tunisia, but also: Canada, Germany, the United States, Japan, Madagascar, Poland, Romania, the United Kingdom, Russia, Singapore, Switzerland and Vietnam.

        In addition, the CFM hosted the associated EuroMech event, hosted by the European Mechanics Society, a learned society that brings together European mechanical specialists. Chaired by Peter Davies, Ifremer, this conference was devoted to the ageing of polymers in the marine environment.    

        It should also be noted that the CFM was an opportunity for the IRDL to discuss the European RAMSSES project. This project brings together 37 partners (including the IRDL) to design the ship of the future. The IRDL is in charge of the following subjects: propellers/propellers and assembly of composite super-structures on metal parts.    

      • Published on 30/08/2019
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