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Dynamic characteristics of the multilobe journal bearings with the lobes of different geometry

Strzelecki Stanislaw

Vibrations in Physical Systems

2023

Vol. 34, nr 2

art. no. 2023225

Multilobe journal bearings are applied in different types of rotating machines such as, e.g. turbounits. The design of such bearings assures proper load capacity, thermal conditions of oil film and stability of the operation of responsible turbounits. However, the design of these bearings can be changed by application of lobes with different geometries. It allows obtaining new family of the dynamic characteristics. The paper presents the multilobe journal bearings with 2- and 3-lobes characterized by different geometry of lobes. The dynamic characteristics in form of the stiffness and damping coefficients of oil film were obtained by perturbation method. Stability ranges of simple symmetric rotor were determined for considered bearings. The iterative solution of Reynolds, energy and viscosity equations allows the obtaining the oil film forces, which were the basis of the bearing dynamic characteristics. Adiabatic, laminar oil film and the static equilibrium position of journal were assumed.

Stiffness and damping coefficients of 8-lobe journal bearings

Strzelecki Stanislaw

Vibrations in Physical Systems

2020

Vol. 31, nr 3

art. no. 2020321

High-speed rotating machinery, such as steam turbines, turbo-compressors, pumps, turbo pumps, accelerating gearboxes contain multilobe journal bearings. The bearings with 8 lobes are applied in bearing system of grinding spindle. The reasons for the application of such bearings are not too high temperatures of bearing operation and specific static and dynamic characteristics. Stiffness and damping coefficients of 8-lobe journal bearings with cylindrical and multilobe profile of lobes were calculated by means of perturbation method. Different values of bearing length to diameter ratio, relative clearance and lobe relative clearance were assumed. Reynolds', energy and viscosity equations were solved by means of iterative procedure. Adiabatic oil film, laminar flow in the bearing gap and aligned orientation of journal in the bearing were considered.