-------------------------------------------------------------------------------
-- Copyright (c) 2001 Mentor Graphics Corporation
--
-- This model is a component of the Mentor Graphics VHDL-AMS educational open 
-- source model library, and is covered by this license agreement. This model,
-- including any updates, modifications, revisions, copies, and documentation 
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-- notice that this model has been modified and the date of modification; and 
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--
-- THIS MODEL IS LICENSED TO YOU "AS IS" AND WITH NO WARRANTIES, EXPRESS OR 
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-------------------------------------------------------------------------------
-- File       : stop_t.vhd
-- Author     : Mentor Graphics
-- Created    : 2001/06/16
-- Last update: 2003-05-13
-------------------------------------------------------------------------------
-- Description: Mechanical Hard Stop (TRANSLATIONAL domain)
-------------------------------------------------------------------------------
-- Revisions  :
-- Date        Version     Author              Description
-- 2001/06/16  1.0         Mentor Graphics     Created    
-------------------------------------------------------------------------------

library IEEE;
use IEEE.MATH_REAL.all;
use IEEE.MECHANICAL_SYSTEMS.all;

entity stop_t is

  generic (
    k_stop    : real;
    pos_max   : displacement;
    pos_min   : displacement := 0.0;
    damp_stop : real         := 1.0e-9
    );

  port ( terminal trans1, trans2 : translational);

end entity stop_t;

architecture ideal of stop_t is

  quantity velocity : velocity;
  quantity position across force through trans1 to trans2;

begin

  velocity == position'dot;

  if position'above(pos_max) use
    force == k_stop * (position - pos_max) + (damp_stop * velocity);
  elsif position'above(pos_min) use
    force   == 0.0;
  else
    force   == k_stop * (position - pos_min) + (damp_stop * velocity);
  end use;

break on position'above(pos_min), position'above(pos_max);

end architecture ideal;

-------------------------------------------------------------------------------
-- Copyright (c) 2001 Mentor Graphics Corporation
-------------------------------------------------------------------------------