rolling cylinder on an elastic half-plane with harmonic oscillations in normal force and rotational speed. part i: solution of the partial slip contact problem

we study the effect of harmonic oscillations during the steady rolling of a cylinder on a plane in partial slip contact conditions in the limit of small oscillations. the solution is an extension of that given in barber et al. for infinitely large coefficient of friction. here, the effect of varying normal load and hence contact area is investigated in detail by analyzing the first order variation of the tangential force and the corresponding relative displacements. in particular, the solution is given in terms of an explicit length scale d in the flamant solution used as a green function. appropriate choice of values of d allows to treat both two-dimensional problems and three-dimensional ones having elliptical contact area sufficiently elongated in the direction of the rotation axis. also, this analysis can be used as starting point for corrugation calculations in railway tracks, where oscillations in time of the normal forces can result in non-uniform wear and hence in amplification of the corrugation.