DATE     97/05/06

    Opérateur CSON                      voir aussi :TAILLE 
    --------------                                  CFL 
                                                      
                                                     
                                                          
       CHAM3  =  'CSON'  MODL1 MATR1 ;
                      

    Description :
    _____________
          This operator computes the velocity of sound waves 
 inside the continuous media described by the model and its
 elastic parameters. The velocity is a function of space and
 is based on the assumption of linear elastic behavior. For instance
 the sound velocity in an isotropic linear elastic media is worth 
          
                 c(M) =  (E(M)/RHO(M)) ** 0.5  

    Contents :
    __________

      MODL1 : the model ( MMODEL type object ).


      MATR1 : field by element ( MCHAML type object ) describing the
              material characteristics (operator MATE) of the model
              including the  geometrical parameter (operator CARA)
              such as  section, inertia ...


      CHAM3  : field by element (MCHAML type object) which contains
               the sound velocity in each element.