DATE     98/04/07
    Opérateur AMOR
    --------------


    Description :
    ____________

    The AMOR operator calculates damping matrices in different cases :


    ----------------------------
    | 1st case : modal damping |
    ----------------------------


    The AMOR operator constructs a diagonal matrix of modal dampings.
 It allocates a reduced damping to each mode of the base. 
 

    AMOR1 = AMOR  | BASE1 |  LREEL1 ;
                  | TAB1  |


    Contents :
    ___________

  AMOR1   : damping matrix (RIGIDITE type, AMORTISSEMENT
            subtype)

  BASE1   : modal base (BASEMODA type)

  TAB1    : TABLE object defining the modes, the pseudo-modes, ...
                - of BASE_MODALE subtype, or
                - ENSEMBLE_DE_BASES subtype

  LREEL1  : coefficients of the reduced modal dampings (in %)
            (LISTREEL type)


    For a sole structure, the n-ith coefficient of the list
 of real numbers corresponds to the n-ith mode of the base.
    For several structures, the list of real numbers will
 be supplied by structure and by mode.


    -----------------------------------
    | 2nd case : absorbing boundaries |
    -----------------------------------



    AMOR1  =  AMOR  MODL1  GEO1  MAT1  ;

    The AMOR operator calculates the damping matrix associated with the 
mesh of the boundary, for either solid or fluid elements, in two or three
dimensions.


    Contents :
    _________

  AMOR1   : damping matrix (RIGIDITE type)

  MODL1   : soil or fluid model (MMODEL type)

  GEO1    : boundary mesh (MAILLAGE type)

  MAT1    : field of material properties for the soil or fluid (MCHAML type)