Squeeze Films: A Finite Journal Bearing With a Fluctuating Load

A review of squeeze films

SYNOPSIS IN INTERLINGUAAMORTIMENTO HYDRODYNAMIC DEL MOBILITATE DE DENTES.—Numeros de Reynold calculate ab le velocitate de intrusion del incisores maxillar del ratto esseva bassissime, lo que indica le predominantia de fortias viscose. Le constantes de resorto calculate ab le periodo de oscillation del dentes monstrava differentias significative, permittente concluder al presentia de un mechanismo amortitori actuate per fortias inertial durante le fluxo de liquido extracellular. Viste que le intrusion monstrava un systema biphasic, le interpretation es hasardate que liquido interstitial, agente como un pellicula resiliente, es le prime factor amortitori active durante le intrusion de un dente ad in su alveolo e que, quando iste pellicula es exhaurite e non replenate, un secunde mechanismo amortitori entra in action resultante ab un stenose de minor vasos sanguinee per fibras periodontal con le accompaniamento de exogene aneurysmas cirsoide que es lentemente deplete a transverso le parietes vascular.

Hydrodynamic Damping of Tooth Movement

Fluid dynamic mechanisms which regulate tooth movement.

In new engines, running conditions for piston pin bushes have become very severe due to combustion pressure and temperature increase Moreover, the lead removal from the bush material has strongly reduced the capability of the antifriction material to accept asperity contacts, geometrical defects or edge loading Today, it is usual that wear and seizure occur in the piston pin bushes during the first steps of engine development In order to propose basic design recommendations avoiding damage, during the early steps of engine development, it is necessary to have quick numerical simulations In these calculations, the mixed lubrication in the piston pin bearings must be taken into account To obtain a simple realistic tool, a refined contact model is implemented in a simple hydrodynamic lubrication program Then, the general behaviour of the piston pin is described before focusing on the combustion cycle phases when damage may occur The oil film thickness variations during cycle are described and show what the critical phases are Several parameters like pin diameter, temperature, pressure-viscosity coefficient have been investigated in order to understand their influence To have an efficient wear modelling a special emphasis is put on the description of asperity contacts in order to built a wear model for bearings located on the piston pin In this wear model, the surface topography parameters are taken into account in order to have a realistic approach and to identify the optimal roughness parameters

Squeeze Films: A Finite Journal Bearing With a Fluctuating Load

Citations

A review of squeeze films

Hydrodynamic Damping of Tooth Movement

Fluid dynamic mechanisms which regulate tooth movement.

Piston pin : Wear and rotating motion

Squeeze Films and Bearing Dynamics

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Squeeze Films for Rectangular Plates