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Calculate the modal parameters of a structure subject to flow. Allows fluid-elastic forces to be taken into account, which are represented by a complex transfer matrix relating them to modal displacements. For certain configurations, the transfer matrix can be broken down into three real matrices of added mass, damping, and stiffness coefficients.

Disturbances in the modal characteristics of the structure depend on the speed of the flow. Thus, the terms of the fluid-elastic force transfer matrix depend on the speed of the fluid and on the frequency of the movement by means of the reduced speed parameter Vr=V/ (F.d).

The operator calculates a modal base modified by the coupling, for each mean speed of the fluid studied. The product concept is of the melasflu type.