Experimental identification of turbulent fluid forces applied to fuel assemblies using an uncertain model and estimation of the fretting-wear

Anas Batou (1) , Christian Soize (1)

1 MSME - Laboratoire de Modélisation et Simulation Multi Echelle

This paper is devoted to the identification of stochastic loads applied to fuel assemblies using an uncertain computational model and experimental measurements of responses. The stochastic loads applied to the structure are induced by a turbulent flow. The structure is made up of a nonlinear complex dynamical system. The experimental responses of the structure are obtained from strain sensors located on the structure. There are several sources of uncertainties in this experimental identification problem of the stochastic loads: uncertainties on the nonlinear dynamical computational model of the structure (fuel assemblies), uncertainties on parameters of the mathematical model of the stochastic loads themselves and finally, measurements errors. All these sources of uncertainties are identified and taken into account in the identification process of the stochastic loads.

Mots clés: uncertainty quantification; nonlinear dynamics; statistical inverse problem; model uncertainties; experimental identification; turbulent fluid forces; fuel assemblies; fretting-wear

Domaines: Mécanique [physics.med-ph]; Probabilités [math.PR]; Statistiques [math.ST]; Vibrations [physics.class-ph]

Anas Batou, Christian Soize. Experimental identification of turbulent fluid forces applied to fuel assemblies using an uncertain model and estimation of the fretting-wear. Proceedings of COMPDYN 2009, ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, Jun 2009, Rhodes, Greece, Greece. pp.1-7. ⟨hal-00692169⟩