Numerical approach to investigation of stability and vibration of rotors supported by long segment bearings lubricated with oil containing air bubbles

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27230%2F04%3A00010507" target="_blank" >RIV/61989100:27230/04:00010507 - isvavai.cz</a>

Result on the web

—

DOI - Digital Object Identifier

—

Result language

angličtina

Original language name

Numerical approach to investigation of stability and vibration of rotors supported by long segment bearings lubricated with oil containing air bubbles

Original language description

The segment hydrodynamical bearings are used to achieve quiet and stable running of rotor systems. The lubricating oil is assumed to be Newtonian liquid containing nonnegligible amount of air. As the bearing gap is very narrow, the pressure distributionin the oil film can be described by a Reynolds' equation applicable for compressible media. To carry out its solution a pressure-density relationship has been derived. The air solutability in the oil is governed by a Henry's law. If all the air is dissolved, the lubricant behaves as incompressible. A finite difference method applied on solving the Reynolds' equation arrives at a set of differential equations that are consequaently transformed to a set of nonlinear algebraic ones. Stability of the equilibrium position is judged according to the system eigenvalues. Solution of the equation of motion is performed by means of a modified Newmark method.

Czech name

Numerický přístup ke zkoumání stability a kmitání rotorů uložených v dlouhých segmentových ložiskách mazaných olejem obsahujícím vzduchové bubliny

Czech description

The segment hydrodynamical bearings are used to achieve quiet and stable running of rotor systems. The lubricating oil is assumed to be Newtonian liquid containing nonnegligible amount of air. As the bearing gap is very narrow, the pressure distributionin the oil film can be described by a Reynolds' equation applicable for compressible media. To carry out its solution a pressure-density relationship has been derived. The air solutability in the oil is governed by a Henry's law. If all the air is dissolved, the lubricant behaves as incompressible. A finite difference method applied on solving the Reynolds' equation arrives at a set of differential equations that are consequaently transformed to a set of nonlinear algebraic ones. Stability of the equilibrium position is judged according to the system eigenvalues. Solution of the equation of motion is performed by means of a modified Newmark method.

Type

D - Article in proceedings

CEP classification

JR - Other machinery industry

OECD FORD branch

—

Project

<a href="/en/project/GA101%2F02%2F0011" target="_blank" >GA101/02/0011: New approach to the analysis of dynamic behaviour of nonlinear coupling elements using in rotor dynamic systems</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2004

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

IMechE Conference Transactions, 8th International Conference on Vibrations in Rotating Machinery

ISBN

1356-1448

ISSN

—

e-ISSN

—

Number of pages

12

Pages from-to

153-162

Publisher name

University of Swansea

Place of publication

London

Event location

Swansea

Event date

Sep 7, 2004

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

—