This information is part of the Modelica Standard Library maintained by the Modelica Association.

This model demonstrates the effect of ElastoGaps on eigenfrequency: Plot mass1.s and mass2.s as well as mass1.v and mass2.v to see that effect.

While mass1 is moved by both spring/damper forces all the time, this is not the case for mass2 since elastoGap1 lifts off at s > -0.5 m and elastoGap2 lifts off at s < +0.5 m. Therefore, mass2 moves freely as long as -0.5 m < s < +0.5 m.