I took a rail vehicle model (after having verified it is in Equilibrium), I defined my own subvars to quasi-linearize the W/R profile and I launched at first a single case Eigenvalues analysis (V=250 km/h, eq.conicity 0.2).

With the same model I built a DoE for analyzing Eigenvalues with two loops (eq. conicity and velocity).

For the case I mentioned above, I obtained different results. Therefore I compared other cases and there are strong differences (i.e. with DoE hunting mode never becomes instable even if the velocity is strongly increased).