Lars Bobach

Simulating transient wear characteristics of journal bearings subjected to mixed friction

This article describes a calculation model for the simulation of the transient wear characteristics of journal bearings subjected to mixed friction. For predetermined time steps the local wear is calculated for circumference and width. The resulting changes to the gap geometry then flow directly into the further calculation process. The solid contact load ratio and boundary friction ratio in the mixed friction area are calculated on the basis of real rough surfaces. Modifications to the rough surfaces resulting from the running-in process are taken into consideration. In addition the microhydrodynamic effects, elastic deformations of the bearing environment and mass conserving cavitation are also recorded. The calculation model’s potential is demonstrated by means of an unsteady loaded conrod bearing.

Oscillating thrust bearing at fuel lubrication

As part of an FVV research project (ref. no. 920) tests were conducted on a diesel injection pump’s oscillating selfaligning thrust bearing at Otto von Guericke University Magdeburg. Combining tests under mixed and boundary lubrication conditions with simulation of the contact conditions deepened knowledge and understanding of the tribological processes that occur.

Oszillierendes Axialgleitlager bei Kraftstoffschmierung

An der Otto-von-Guericke-Universitat Magdeburg wurden im Rahmen des FVV-Forschungsvorhabens Nr. 920 Untersuchungen an einem oszillierenden kippbeweglichen Axialgleitlager einer Dieseleinspritzpumpe durch gefuhrt. Durch die Kombination von Versuchen unter Misch- und Grenzreibungsbedingungen und Simulation der Kontaktverhaltnisse konnte das Verstandnis der dabei ablaufenden tribologischen Prozesse vertieft werden.