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Shock and Vibration
Volume 13, Issue 4-5, Pages 285-300
http://dx.doi.org/10.1155/2006/785823

Influence of Journal Bearing Axial Grooves on the Dynamic Behavior of Horizontal Rotors

Miguel Angelo de Carvalho Michalski,1 Moysés Zindeluk,2 and Renato de Oliveira Rocha1

1Cepel, Centro de Pesquisa em Energia Elétrica, Av. Jequitibá s/n, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ, CEP: 21944-970, Brazil
2COPPE/UFRJ, LAVI, Sala I-130, Centro de Tecnologia, Av. Jequitibá s/n, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ, CEP: 21945-970, Brazil

Received 19 July 2006; Revised 19 July 2006

Copyright © 2006 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Journal bearing design and the lubricant characteristics are very influential in a rotating machine behaviour. The bearing geometry can drastically affect the lubricant flow and also the rotor dynamics. Approaching that issue, this paper presents an experimental study of the dynamic behavior of a horizontal rotor suported by journal bearings with semi-circular axial grooves. The journal bearings were manufactured with a varied number of axial grooves and a versatile test rig is used, making possible the analysis of different configurations. The acquired signals are analyzed with classical and non-linear tools and the differences among the rotors’ configurations can be shown.