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diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/analog-modeling/moving_mass.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/analog-modeling/moving_mass.vhd
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+
+-- Copyright (C) 2002 Morgan Kaufmann Publishers, Inc
+
+-- This file is part of VESTs (Vhdl tESTs).
+
+-- VESTs is free software; you can redistribute it and/or modify it
+-- under the terms of the GNU General Public License as published by the
+-- Free Software Foundation; either version 2 of the License, or (at
+-- your option) any later version. 
+
+-- VESTs is distributed in the hope that it will be useful, but WITHOUT
+-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+-- FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+-- for more details. 
+
+-- You should have received a copy of the GNU General Public License
+-- along with VESTs; if not, write to the Free Software Foundation,
+-- Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+
+library ieee_proposed;  use ieee_proposed.mechanical_systems.all;
+                        
+entity moving_mass is
+  port ( terminal external_attachment : translational );
+end entity moving_mass;
+
+----------------------------------------------------------------
+
+architecture behavioral of moving_mass is
+  constant mass : real := 10.0;
+  constant stiffness : real := 2.0;
+  constant damping : real := 5.0;
+  quantity position across driving_force through external_attachment;
+  quantity velocity : real;
+begin
+  position == velocity'integ;
+  mass * velocity'dot == driving_force - stiffness * velocity'integ - damping * velocity
+    tolerance velocity'tolerance;
+end architecture behavioral;