More accurate determination of a pressure function in long hydrodynamical bearings

• Autorzy: Zapoměl J.
• Konferencja: Modelling and optimization of physical systems / International Seminar of Applied Mechanics (6 ; 31.05-02.06.2002 ; Wisła, Polska)
• Języki publikacji: EN

Abstrakty

EN

Fluid-film bearings are usually incorporated into computational models by means of nonlinear force couplings. Calculation of components the hydraulical force through which the layer of lubricant acts on the rotor journal and bearing shell requires to determine a pressure distribution ( a pressure function ) in the bearing gap which is described by a set of Navier-Stokes equations. Because their solution (together with the equation of continuity) is considerably time consuming, a new approach to calculation of the pressure function has been developed. It consists in averaging the terms in the Navier-Stokes equation corresponding to the direction of prevailing pressure gradient (in long bearings it is in the circumferential direction ). To perform this manipulation velocity profiles obtained from solving a Reynolds' equation are applied. As the pressure function is 2π-periodic, it is approximated by a finite number of terms of a Fourier series and the Fourier coefficients are calculated by means of a trigonometric collocation method.

Słowa kluczowe

EN

hydrodynamical bearing; fluid film; Navier-Stokes equations; pressure function

PL

łożysko hydrodynamiczne; tarcie płynne; równania Naviera-Stokesa; funkcja ciśnienia

• Wydawca: Wydawnictwo Katedry Mechaniki Stosowanej
• Czasopismo: Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska
• Rocznik: 2002
• Tom: z. 19
• Strony: 173--178
• Opis fizyczny: Bibliogr. 6 poz.

Twórcy

autor

Zapoměl J.

• Department of Mechanics, VŠB - Technical University of Ostrava