Określenie amplitudy drgań samowzbudnych sztywnego wirnika podpartego w łożyskach niekołowych n-powierzchniowych

Andrzej Lasocki

Abstract

In this paper the amplitude of self-excited vibration of a symetric rigid rotor supported on n-lobe journal bearings is investigated. The short bearing model was used as the support bearing model, but even in that case the precise integration of the oil flow is impossible to be carried out. That is why the so-called geometric approximation method bas been incorporated to derivation of the oil pressure distribution. This method repleces the noncircular bearing contours with arc segments, using proper weight factors. On the grounds of the obtained analytical expressions descreibing the pressure distribution, the hydrodynamic uplift forces have been evaluated. These forces present combined nonlinear dependencies of the displacements and velocities of the rotor journal centres. Based on the derived equations of motion of the considered system (strongly nonlinear and coupled), a numerical analysis of the rotor self-excited vibrations has been conducted, taking into account its structural and operating parameters. The results have been presented in graphs.
Diploma typeDoctor of Philosophy
Author Andrzej Lasocki (FACME / IMDF)
Andrzej Lasocki,,
- Institute of Machine Design Fundamentals
Title in PolishOkreślenie amplitudy drgań samowzbudnych sztywnego wirnika podpartego w łożyskach niekołowych n-powierzchniowych
Languagepl polski
Certifying UnitFaculty of Automotive and Construction Machinery Engineering (FACME)
Disciplinemechanical engineering / (technology domain) / (technological sciences)
Defense Date12-12-2001
Supervisor Zbigniew Starczewski (FACME / IMDF)
Zbigniew Starczewski,,
- Institute of Machine Design Fundamentals

Pages260
Keywords in Polishłożyskowanie, wały maszynowe, drgania maszyn, programy komputerowe
Abstract in EnglishIn this paper the amplitude of self-excited vibration of a symetric rigid rotor supported on n-lobe journal bearings is investigated. The short bearing model was used as the support bearing model, but even in that case the precise integration of the oil flow is impossible to be carried out. That is why the so-called geometric approximation method bas been incorporated to derivation of the oil pressure distribution. This method repleces the noncircular bearing contours with arc segments, using proper weight factors. On the grounds of the obtained analytical expressions descreibing the pressure distribution, the hydrodynamic uplift forces have been evaluated. These forces present combined nonlinear dependencies of the displacements and velocities of the rotor journal centres. Based on the derived equations of motion of the considered system (strongly nonlinear and coupled), a numerical analysis of the rotor self-excited vibrations has been conducted, taking into account its structural and operating parameters. The results have been presented in graphs.
Thesis file
Lasocki_Andrzej_okreslenie.pdf 18.61 MB
Citation count*4 (2015-07-23)

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