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diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/analog-modeling/tb_piston.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/analog-modeling/tb_piston.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 tb_piston is
+end tb_piston;
+
+architecture TB_piston of tb_piston is
+    -- Component declarations
+    -- Signal declarations
+    terminal n1, n2 : translational;
+begin
+    -- Signal assignments
+    -- Component instances
+    Force1 : entity work.ForcePulse_t(ideal)
+        generic map(
+            initial => 0.0,
+            pulse => 20.0e-3,
+            ti2p => 1 ms,
+            tp2i => 1 ms,
+            delay => 1 ms,
+            width => 1 sec,
+            period => 3 sec
+        )
+        port map(
+            trans_pos => n1,
+            trans_neg => TRANSLATIONAL_REF
+        );
+    mass1 : entity work.piston(simple)
+        port map(
+            motion => n1
+        );
+    Force2 : entity work.ForcePulse_t(ideal)
+        generic map(
+            initial => 0.0,
+            pulse => 20.0e-3,
+            ti2p => 1 ms,
+            tp2i => 1 ms,
+            delay => 1 ms,
+            width => 1 sec,
+            period => 3 sec
+        )
+        port map(
+            trans_pos => n2,
+            trans_neg => TRANSLATIONAL_REF
+        );
+    mass2 : entity work.mass_t(ideal)
+        generic map(
+            m => 10.0
+        )
+        port map(
+            trans1 => n2
+        );
+end TB_piston;