Description of the rolling friction process by acoustic modelling

Point Distributed Static Load of a Rough Elastic Contact Can Cause Broadband Vibrations During Rolling

“…7). Here the results coincide with those in [5]. The investigations on the wheel/rail system in the ultrasonic range [1] show a speed exponent of 3-4, that is a level increase of 10-12 dB per doubling the speed.…”

“…The aim of the present paper was to modify and extend the ideas expressed in [5] with regard to the application as a vibration excitation mechanism, looking for the possibility to include the Hertzian elastic impact theory into the approach, and additionally, to relate the results to an experimentally investigated set-up which consist of a rolling cylinder on a flat beam. Because of the broadband character of the expected effects they are also relevant in view of their importance in the audio-frequency range.…”

“…It connects well-known statistical approaches of elastic rough contact mechanics with some aspects of signal processing. Earlier investigations at the wheel/rail system [1,2] have shown, that the rolling process can create high vibration amplitudes up to some hundred kilo-Hertz, similar effects are known from rolling bearings [3][4][5]. The known and commonly used theory of rolling noise generation in the audible frequency range is based on a direct displacement excitation caused by the resulting tread roughness [6].…”

“…The existance of such pulses was discussed first in [10] in a more qualitative sense. A serious calculation model was developed in [5], here the elastic contact region of a cylinder on a smooth plane with its typical Hertzian global pressure distribution is divided into small strips with a corresponding constant partial pressure. These strips are matched stepwise in the rolling direction with groups of actual contacting asperities of the roughness of the plane.…”

Finite element analysis of the rolling friction of a viscous particle on a rigid plane

“…Various mechanisms have been proposed and may be classified into two groups. The first is the energy dissipation at the contact interface of two particles, due to the micro-slip and friction [5], surface irregularities [6][7][8][9][10], molecular adhesion [11][12][13], or other surface properties [14,15]. The kinetic energy of a particle is thereby dissipated, resulting in the deceleration of the rolling speed of the particle, which is a usual phenomenon of friction.…”