Scientific Bulletin Series C, Volume XXII (2008)
SOME ASPECTS REGARDING INSTANTANEOUS SQUEEZE FORCE TO THE NARROW RADIAL BEARING WORKING UNDER HARD SHOCKS
Marius Alexandrescu, Radu Coteţiu, Adriana Coteţiu, Marius Cosma, Mihai Tiron, Dinu Darabă
Abstract: Due to the very short time of loading radial bearings exposed to shocks and vibrations, of about 0.5-1 ms, the effect of the lubricant expulsion be prevalent in the achieving of the self-carrying film. We consider only the approaching motion between spindle/axle and bushing on the direction of the center line, without the rotation of the spindle/axle (the case of the non-rotating bearing). We present the determining relationship of carriage in non-dimensional form for narrow radial bearings exposed to shocks and vibrations, as well as the determining relationships of the lubricant minimum thickness in relation to the dynamic loading.
Keywords: impulse loading, squeeze film, radial hydrodynamic bearing.
COMPARATIVE ANALYSIS OF DIFFERENT METHODS OF RELIABILITY ASSESSMENT FOR CONTINUOUS MINING TECHNOLOGICAL SYSTEMS
Iosif ANDRAS, Stela DINESCU, Andrei ANDRAS
Abstract: The paper deals with the analysis of reliability parameters of continuous mining systems using different approaches in order to perform a quick assessment of the overall equipment effectiveness of this kind of production systems, such as Monte Carlo simulation and stress-strength interference.
Keywords: mining, reliability, simulation, effectiveness.
