Frequency sweep analysis using code_aster
code_aster offers numerous dynamic analysis options: full transient (see “Dynamic stability of 3d-printed device“), modal, spectral and harmonic. This post presents an example of the latest applied to a 8 stories building.
The harmonic analysis can be performed directly in the physical space, or by the modal superposition method – which could be useful for large problems (superposition of modes of the full structure or a series of sub-structures).
The macro commande DYNA_VIBRA gathers many of the dynamic options under a single command, e.g.:
Haro = DYNA_VIBRA( TYPE_CALCUL='HARM', BASE_CALCUL='PHYS', MATR_MASS=M3, MATR_RIGI=K3, MATR_AMOR=C3, LIST_FREQ=listfreq, EXCIT=_F(VECT_ASSE=F3, COEF_MULT=1.0), );
The new DEFI_LIST_FREQ command creates a list a frequencies to sweep with an automatique refinement around the natural modes of the structure.
For training or consulting using code_aster, contact us.