The Sign Force component generates a constant force that changes sign with direction of movement.

The parameter reg selects the equation for the force when the magnitude of the velocity is below $v_0$.

$f\=-f_{\mathrm{flange}}\=f_{\mathrm{nom}}\{\begin{array}{cc}\frac{2}{1\+\exp \left(\mathrm{-100}\frac{v}{v_0}\right)}-1& \mathrm{reg}\=\mathrm{Exp}\\ \{\begin{array}{cc}1& v_0\le \left|v\right|\\ \sin \left(\frac{1}{2}\mathrm{\pi }\frac{v}{v_0}\right)& \mathrm{otherwise}\end{array}& \mathrm{reg}\=\mathrm{Sine}\\ \{\begin{array}{cc}1& v_0\le \left|v\right|\\ \frac{v}{v_0}& \mathrm{otherwise}\end{array}& \mathrm{reg}\=\mathrm{Linear}\\ \{\begin{array}{cc}1& v_0\le \left|v\right|\\ \left(1-\cos \left(\frac{1}{2}\mathrm{\pi }\frac{v}{v_0}\right)\right)& \mathrm{otherwise}\end{array}& \mathrm{otherwise}\end{array}$

$s\=s_{\mathrm{flange}}-s_{\mathrm{support}}$

$v\=\frac{ds}{\mathrm{dt}}$

$\mathbf{if}\mathrm{Use\; Support\; Flange}\mathbf{then}{f}_{\mathrm{support}}\=-f$

$s\=s_{\mathrm{flange}}-\{\begin{array}{cc}{s}_{\mathrm{support}}& \mathrm{Use\; Support}\\ 0& \mathrm{otherwise}\end{array}$

The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.