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% Verbal description for system Poly (Poly_desc.tex)
% Generated by MTT on Thu Mar 19 13:24:59 GMT 1998.
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% %% Revision 1.3 1998/03/31 15:05:33 peterg
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% %% Revision 1.2 1998/03/27 10:56:14 peterg
% %% Added bicausal bit
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% %% Revision 1.1 1998/03/26 15:13:35 peterg
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The acausal bond graph of system \textbf{Poly} is
displayed in Figure \Ref{Poly_abg} and its label
file is listed in Section \Ref{sec:Poly_lbl}.
This four-port component computes the temperature following a
polytropic expansion using:
\begin{equation}
T_2 = T_1 \left ( \frac{P_2}{P_1} \right )^\alpha
\end{equation}
where $\alpha = \frac{n-1}{n}$ and $n$ is the coefficient of
polytropic expansion. This component imposes zero flow at all its
ports and therefore does not affect energy balance.
The output is \emph{bicausal} as it imposes both $T_2$ and a zero flow.
This is implemented using the bicausal \textbf{SS} component labeled
``zero''.