Quasi-Static approximation

The playing frequency is much lower than the resonance frequency $\omega_r$.

\begin{displaymath}H_c(s)\Delta P(s) \simeq H_c(0)\Delta P(s)\end{displaymath}


\begin{displaymath}\Rightarrow Y_r(s) \simeq -\Delta P(s)/k_r \end{displaymath}



$\Downarrow$
$
u_f= \left\{
\begin{array}{lr} \displaystyle
A\cdot \mbox{sgn}(\Delta p) ...
...\
&\\
0 & \hspace{.5 cm}\mbox{if } \Delta p\geq k_r H
\end{array}\right.
$
\includegraphics[width=8cm]{static.eps}


2000-09-12