In order to improve the prediction of wear problems due to flow-induced vibration in PWR components, an inverse method for identifying a distributed random excitation acting on a dynamic system has been developed at EDF. This method, whose applications go far beyond the flow-induced vibration field, has been implemented into the Meidee software.

A theoretical presentation of this method is proposed in the first part of the paper. The second part illustrates an application of this inverse excitation identification process on a flow-induced vibration experiment. The experimental set-up consists of a straight tube submitted to a complex three-dimensional turbulent water flow. This tube, clamped at one end, can be supported in various ways at the other end. The structural response measured in a linear support configuration taken as a reference is first used to identify the turbulent excitation exerted on the tube. The experimental results obtained with other supports are then used to validate the identified turbulent excitation and, thus, the inverse estimation process presented in the first part of the paper.

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