ADDED   mttroot/mtt/lib/comp/compound/Mechanical/Mechanical-1D/BernoulliEuler/BernoulliEuler_desc.tex
Index: mttroot/mtt/lib/comp/compound/Mechanical/Mechanical-1D/BernoulliEuler/BernoulliEuler_desc.tex
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+% -*-latex-*- Put EMACS into LaTeX-mode
+% Verbal description for system BernoulliEuler (BernoulliEuler_desc.tex)
+% Generated by MTT on Mon Apr 19 06:43:36 BST 1999.
+
+% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% %% Version control history
+% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% %% $Id$
+% %% $Log$
+% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+   The acausal bond graph of system \textbf{BernoulliEuler} is
+   displayed in Figure \Ref{fig:BernoulliEuler_abg.ps} and its label
+   file is listed in Section \Ref{sec:BernoulliEuler_lbl}.
+   The subsystems are listed in Section \Ref{sec:BernoulliEuler_sub}.
+
+This component represents one lump of a lumped model of a uniform beam
+modelled using the the Bernoulli-Euler assumptions:
+\begin{enumerate}
+\item The shear forces can be neglected.
+\item Rotational inertia can be neglected.
+\end{enumerate}
+
+\begin{itemize}
+\item The \textbf{I} component represents the inertial properties of
+  the lump in the perpendicular direction. In particular the velocity
+  of the lump $v$ is:
+  \begin{equation}
+    \dot v = \frac{\Delta f}{\Delta m}
+  \end{equation}
+  where $\Delta m$ is the lump mass and $\Delta f$ is the net vertical
+  force.
+\item The \textbf{C} component represents the angular stiffness of the
+  lump. In particular the torque acting on the lump is:
+  \begin{equation}
+    \dot \tau =  \Delta k \Delta \Omega
+  \end{equation}
+  where $\Delta k$ is the lump (angular) stiffness and $\Delta \Omega$
+  is the net angular velocity.
+\item The \textbf{TF} component represents the relation between the
+  angular domains
+  \begin{equation}
+    \begin{align}
+      \tau &= \Delta x \Delta f \\
+      \Delta v &= \Delta x \Omega 
+    \end{align}
+  \end{equation}
+\end{itemize}

ADDED   mttroot/mtt/lib/comp/compound/Mechanical/Mechanical-1D/BernoulliEuler/BernoulliEuler_lbl.txt
Index: mttroot/mtt/lib/comp/compound/Mechanical/Mechanical-1D/BernoulliEuler/BernoulliEuler_lbl.txt
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+++ mttroot/mtt/lib/comp/compound/Mechanical/Mechanical-1D/BernoulliEuler/BernoulliEuler_lbl.txt
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+%% Label file for system BernoulliEuler (BernoulliEuler_lbl.txt)
+%SUMMARY BernoulliEuler
+%DESCRIPTION <Detailed description here>
+
+% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% %% Version control history
+% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% %% $Id$
+% %% $Log$
+% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+
+% Port aliases
+%ALIAS	in	y_in,theta_in
+%ALIAS	out	y_out,theta_out
+
+% Argument aliases
+%ALIAS	$1	dk
+%ALIAS	$2	dm
+%ALIAS	$3	dz
+%ALIAS	$4	dr_y
+
+%% Each line should be of one of the following forms:
+%	     a comment (ie starting with %)
+%	     component-name	cr_name	arg1,arg2,..argn
+%	     blank
+
+% ---- Component labels ----
+
+% Component type I
+	dm		lin	flow,dm
+
+% Component type C
+	dk		lin	state,dk
+
+% Component type SS
+	[y_in]	SS			external,external
+	[y_out]	SS			external,external
+	[theta_in]	SS		external,external
+	[theta_out]	SS		external,external
+
+% Component type TF
+	dz		lin	effort,dz