A fast Newton-Raphson method is presented for the finite element analysis of dynamically loaded flexible journal bearings. The method makes use of 8-node isoparametric elements for the lubrication analysis and 20-node isoparametric elements for the structural analysis. Results are presented for the Ruston and Hornsby 6VEB Mk III marine diesel big-end bearing using this method. The computing time required for this analysis is more than two orders of magnitude less than that previously reported for an elastohydrodynamic bearing analysis using a conventional Newton-Raphson method.
Clearance joints in high-speed mechanisms can suffer from contact loss, leading to noise generation and joint deterioration. To predict the onset of contact loss detailed modelling of the joint is required. I n this paper a clearance joint is modelled using a combined massless link and spring-damper unit, where the bearing stiffness (spring element) is estimated from a three-dimensional finite element analysis.The combined model is shown to exhibit chaotic behaviour just prior to contact loss and the predictions correlate well with experimental results. The bearing stiffness and damping are shown to have a significant effect on the behaviour of the joint, including the occurrence of chaos and the extent of contact loss regions.
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