source: trunk/Block-Oriented EML/Control Systems/Lead_Lag.mso @ 998

#*-------------------------------------------------------------------
* EMSO Model Library (EML) Copyright (C) 2004 - 2007 ALSOC.
*
* This LIBRARY is free software; you can distribute it and/or modify
* it under the therms of the ALSOC FREE LICENSE as available at
* http://www.enq.ufrgs.br/alsoc.
*
* EMSO is distributed under the terms of the ALSOC LICENSE as
* available at http://www.enq.ufrgs.br/alsoc.
*-----------------------------------------------------------------------
* Author: Jonathan Ospino P.
* $Id: Lead_Lag.mso  2012$
*---------------------------------------------------------------------*#

using "types";
 
Model Lead_Lag
        
        ATTRIBUTES
        Pallete=true;
        Icon="icon/Lead-Lag";
        Info="== Lead-Lag Unit ==
              
                  It takes an input variable and computes 
              the respective value of the output variable according
              to a Lead-Lag Unit Dynamics.";
        
        PARAMETERS
        TauLD as time_sec(Brief="Lead Time constant");
        TauLG as time_sec(Brief="Lag Time constant");
                        
        VARIABLES
        in In as Real(Brief="Input variable",Protected=true,PosX=0,PosY=0.5);
        x as Real(Brief="Intermediate variable",Hidden=true);
        out Out as Real(Brief="Output variable",Protected=true,PosX=1,PosY=0.5);
        
        EQUATIONS
        
        #* A lead-lag unit can be interpreted as a pure lag unit
        followed by a pure lead unit
        *#
        
        "Pure Lag Unit Dynamics (FOD)"
        TauLG*diff(x)+x=In;

        "Pure Lead Unit Dynamics (FOD)"
        Out=TauLD*diff(x)+x;

        INITIAL
        x=0;
end