5. example

5.1. Modal calculation on matrices with or without Lagrange equations

K1 = ASSE_MATRICE (NUME_DDL =NU, MATR_ELEM = KEL,)

M1 = ASSE_MATRICE (NUME_DDL =NU, MATR_ELEM = MEL,)


# 1. calculation with full matrices:

#-------------------------------------------------------


mode1 = CALC_MODES (MATR_RIGI =K1,

MATR_MASS =M1,

OPTION =' BANDE ',

CALC_FREQ =_F (FREQ =( -2, 30),))


# 2. calculation with matrices reduced by ELIM_LAGR:

#-------------------------------------------------------


K2= ELIM_LAGR (MATR_RIGI =K1,)

M2= ELIM_LAGR (MATR_RIGI =K1, MATR_ASSE =M1)


mode2 = CALC_MODES (MATR_RIGI =K2,

MATR_MASS =M2,

OPTION =' BANDE ',

CALC_FREQ =_F (FREQ =( -2, 30),))

mode3 = REST_GENE_PHYS (RESU_GENE =mode2)