3. Features

The operator DYNA_ALEA_MODAL makes it possible to calculate the response in the frequency domain, on a modal basis, of a structure subjected to an excitation represented by an interspectral matrix (conferdefi_inte_spec [U4.36.02]).

The magnitude of excitement may be of the type of imposed ddl or effort associated with a degree of freedom. It can also correspond to sources of fluid excitation [R4.05.02].

The excitation can be given in derivative form with an order equal to 0, 1 or 2 (displacement, speed or acceleration).

The operator RESt_spec_PHYS [U4.63.22] makes it possible to restore the response when moving or in effort to the degrees of freedom « of observation » (node pair, component).

The interspectral modal response matrix thus calculated can be reintroduced into a new calculation.