Conclusion and Perspectives ========================== Currently, it is assumed that the load was decomposed beforehand by the user, i.e. that :math:`{\left\{{F}_{l}^{s},{F}_{l}^{a}\right\}}_{l\ge 0}` is known. This decomposition could be carried out by a *Code_Aster* operator who would project the load onto Fourier modes. For the moment, only the non-anisotropic case is implemented, that is to say that there is never coupling of the modes. The extension to anisotropy may constitute a further development.