Probabilistic approach to wave impact loads on naval structures – APPHY
The project APPHY (probabilistic approach to wave impact loads on naval structures) is organized around a consortium involving one academic partner (Institut de Recherche Dupuy de Lôme (FRE CNRS 3744)), one public research institute (IFREMER) and two major naval companies (DCNS via SIREHNA and Bureau Veritas).
The main objective is to develop new methodologies for the design of marine structures subjected to wave impact loads. From existing methods, we expect to better account for the stochastic nature of the loadings. As a matter of fact, some parts of the structure may undergo a large number of wave impacts during their service life or lifetime. That means we face a large range of kinematic conditions combined to a large range of hydrodynamic loads. The structural design combines considerations of ultimate strength and fatigue damage. For this purpose, one needs to assess not only the loads generated from slamming but also the number of occurrences.
These problems will be addressed through the following tasks:
1) The development of fast analytical models which provide slamming loads in realistic kinematic sea states. In parallel, numerical simulations (CFD) are carried out for the sake of comparison, validation and identification of the domain of validity of the analytical models.
2) A chain of stochastic routines will be designed to assess the probability distributions of the loads (and stress in the structure) during the lifetime of the vessel. That chain couples a seakeeping code (to identify the kinematics when slamming events occur), a slamming code and a structural model.
3) An experimental program will be performed in a wave tank. The experimental data will be used to validate the modelling. Realistic sea states will be generated and the loads will be measured. Regular and irregular waves will be considered.
4) The synthesis of the results will lead to improve the practices for the sizing, the design and the reliability assessment of marine structures.
Monsieur Nicolas JACQUES (Institut de Recherche Dupuy de Lôme)
The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.
BV BUREAU VERITAS MARINE & OFFSHORE
IRDL Institut de Recherche Dupuy de Lôme
IFREMER Institut français de recherche pour l'exploitation de la mer
Help of the ANR 299,299 euros
Beginning and duration of the scientific project: December 2017 - 36 Months