Stabilita olejového filmu eliptických a přesazených dlouhých kluzných ložisek

Oil Film Flow Stability of Long Lemon and Offset Bearings

článek ve sborníku ve WoS nebo Scopus

en

This contribution deals with computational modelling of oil film flow stability of long non-cavitating journal bearings. In this contribution is presented a new theoretical approach to the modelling of static and dynamic behaviour of the rigid rotating body in real liquid. The approach is based on the application of Navier-Stokes motion eq., equation of continuity and boundary conditions eqs. It is possible to separate the motion of the rigid body and real liquid from each other using suitable transformation relations and then it is also possible to separate the stationary and nonstationary motions from each other. A method of control volumes is used for these analyses. The real Bézier body is used for description of the geometrical configuration and also for approximation of velocity and pressure functions. The combined ALE (Arbitrary Lagrange-Euler) method is used, because it's necessary to generate a new net (perform new meshing) for a change of the shaft position. Oil film flow stability is analysed through an eigenvalue problem. Some results of the numerical solution of the model task are presented in this contribution.

Příspěvek se zabývá výpočtovou analýzou statických a dynamických vlastností hydrodynamických kluzných ložisek.

This contribution deals with computational modelling of oil film flow stability of long non-cavitating journal bearings. In this contribution is presented a new theoretical approach to the modelling of static and dynamic behaviour of the rigid rotating body in real liquid. The approach is based on the application of Navier-Stokes motion eq., equation of continuity and boundary conditions eqs. It is possible to separate the motion of the rigid body and real liquid from each other using suitable transformation relations and then it is also possible to separate the stationary and nonstationary motions from each other. A method of control volumes is used for these analyses. The real Bézier body is used for description of the geometrical configuration and also for approximation of velocity and pressure functions. The combined ALE (Arbitrary Lagrange-Euler) method is used, because it's necessary to generate a new net (perform new meshing) for a change of the shaft position. Oil film flow stability is analysed through an eigenvalue problem. Some results of the numerical solution of the model task are presented in this contribution.

Kluzná ložiska, výpočtová analýza, Bézierova tělesa, Navier-Stokesova rovnice

Journal bearings, computational modelling, Navier-Stokes motion eq., Bézier body application

2003

01.01.2003

Institute of Theoretical and Applied Mechanics, Academy of Sciences of the Czech Republic

Svratka

80-86246-18-3

Engineering Mechanics 2003, Book of Extended Abstracts

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