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\textit{Oh, an empty article!}   Las ecuaciones que modelan el sistema son las siguiente siguientes  \begin{align}  \frac{dh_1}{dt}=u1-\frac{a_1}{A_1\sqrt{2gh_1} \frac{dh_1}{dt}=\frac{u_1}{A_1}-\frac{a_1}{A_1}\sqrt{2gh_1}  \end{align}  Linearización  \begin{eqnarray}   \frac{d\Delta %Linearización  %\begin{eqnarray}   %\frac{d\Delta  h_1}{dt}&=-\sqrt{2g}\frac{a_1}{A_1}\frac{\Delta h_1}{2\sqrt{h_{1,0}}}+ \frac{\Delta u_1}{A_1} \\ \frac{d\Delta %\frac{d\Delta  h_2}{dt}&=\sqrt{2g}\frac{a_1}{A_2}\frac{\Delta h_1}{2\sqrt{h_{1,0}}} -\sqrt{2g}\frac{a_2}{A_2}\frac{\Delta h_2}{2\sqrt{h_{2,0}}} \\ \frac{d\Delta %\frac{d\Delta  h_3}{dt}&=\sqrt{2g}\frac{a_2}{A_3}\frac{\Delta h_2}{2\sqrt{h_{2,0}}} -\sqrt{2g}\frac{a_3}{A_3}\frac{\Delta h_3}{2\sqrt{h_{3,0}}}+\frac{\Delta u_2}{A_3}\\ \frac{d\Delta %\frac{d\Delta  h_4}{dt}&=\sqrt{2g}\frac{a_3}{A_4}\frac{\Delta h_3}{2\sqrt{h_{3,0}}} -\sqrt{2g}\frac{a_4}{A_4}\frac{\Delta h_4}{2\sqrt{h_{4,0}}} \end{eqnarray}   Funciones %\end{eqnarray}   %Funciones  de transferencia \begin{eqnarray}  H_1&=\frac{U_1}{(S+\sqrt{2g}\frac{a_1}{A_1}\frac{1}{2\sqrt{h_{1,0}}})A1}\\  H_2&=\frac{\sqrt{2g}\frac{a_1}{A_2}\frac{H_1}{2\sqrt{h_{1,0}}}}{(S+\sqrt{2g}\frac{a_2}{A_2}\frac{1}{2\sqrt{h_{2,0}}})}\\  H_3&=\frac{\sqrt{2g}\frac{a_2}{A_3}\frac{H_2}{2\sqrt{h_{2,0}}}+\frac{U_2}{A_3}}{(S+\sqrt{2g}\frac{a_3}{A_3}\frac{1}{2\sqrt{h_{3,0}}})}\\  H_4&=\frac{\sqrt{2g}\frac{a_3}{A_4}\frac{H_3}{2\sqrt{h_{3,0}}}}{(S+\sqrt{2g}\frac{a_4}{A_4}\frac{1}{2\sqrt{h_{4,0}}})}\\  \end{eqnarray} %\begin{eqnarray}  %H_1&=\frac{U_1}{(S+\sqrt{2g}\frac{a_1}{A_1}\frac{1}{2\sqrt{h_{1,0}}})A1}\\  %H_2&=\frac{\sqrt{2g}\frac{a_1}{A_2}\frac{H_1}{2\sqrt{h_{1,0}}}}{(S+\sqrt{2g}\frac{a_2}{A_2}\frac{1}{2\sqrt{h_{2,0}}})}\\  %H_3&=\frac{\sqrt{2g}\frac{a_2}{A_3}\frac{H_2}{2\sqrt{h_{2,0}}}+\frac{U_2}{A_3}}{(S+\sqrt{2g}\frac{a_3}{A_3}\frac{1}{2\sqrt{h_{3,0}}})}\\  %H_4&=\frac{\sqrt{2g}\frac{a_3}{A_4}\frac{H_3}{2\sqrt{h_{3,0}}}}{(S+\sqrt{2g}\frac{a_4}{A_4}\frac{1}{2\sqrt{h_{4,0}}})}\\  %\end{eqnarray}     
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