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http://repositorio.unicamp.br/jspui/handle/REPOSIP/347406
Type: | Artigo |
Title: | On the instability threshold of journal bearing supported rotors |
Author: | Mendes, Ricardo Ugliara Cavalca, Katia Lucchesi |
Abstract: | Journal bearing supported rotors present two kinds of self-excited vibrations: oil-whirl and oil-whip. The first one is commonly masked by the rotor unbalance, hence being rarely associated with instability problems. Oil-whip is a severe vibration which occurs when the oil-whirl frequency coincides with the first flexural natural frequency of the shaft. In many cases, oil-whip is the only fluid-induced instability considered during the design stage; however, experimental evidences have shown that the instability threshold may occur much sooner, demanding a better comprehension of the instability mechanism. In this context, numerical simulations were made in order to improve the identification of the instability threshold for two test rig configurations: one on which the instability occurs on the oil-whip frequency, and another which became unstable before this threshold. Therefore, the main contribution of this paper is to present an investigation of two different thresholds of fluid-induced instabilities and their detectability on design stage simulations based on rotordynamic analysis using linear speed dependent coefficients for the bearings |
Subject: | Rotores |
Country: | Reino Unido |
Editor: | Hindawi |
Rights: | Aberto |
Identifier DOI: | 10.1155/2014/351261 |
Address: | https://www.hindawi.com/journals/ijrm/2014/351261/ |
Date Issue: | 2014 |
Appears in Collections: | FEM - Artigos e Outros Documentos |
Files in This Item:
File | Description | Size | Format | |
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2-s2.0-84894821865.pdf | 5.77 MB | Adobe PDF | View/Open |
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