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Dynamic characteristics and stability of high speed cylindrical journal bearing

Strzelecki S.

Vibrations in Physical Systems

2018

Vol. 29

art. no. 2018025

The operation of plain circular journal bearing at high speed is restricted by the excessive temperature that is generated in the oil film and by the loss of stability. Low costs of machining, high-transmitted loads are the advantages of these types of bearings. Better knowledge of bearing operation and its stability from the point of hydrodynamic theory of lubrication and theory of vibration can be affected by modifications of bearing design. These modifications should result in the higher speeds of operation, decrease in power losses and better bearing stability. The basis of stability determination is the dynamic characteristics of bearing. For the plain circular journal bearing the dynamic characteristics has been calculated. Stability of high speed, symmetric rotor was determined, too. Different values of bearing length to diameter ratio, and 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 as well as aligned orientation of journal in the bearing was considered.

Capacity forces in slide journal bearing lubricated oil with micropolar structure

Krasowski P.

Journal of Polish CIMAC

2009

Vol. 4, no 2

129-136

Present paper shows the results of numerical solution Reynolds equation for laminar, steady oil flow in slide cylindrical bearing gap. Lubrication oil is fluid with micropolar structure. Properties of oil lubrication as of liquid with micropolar structure in comparison with Newtonian liquid, characterized are in respect of dynamic viscosity additionally dynamic couple viscosity and three dynamic rotation viscosity. Under regard of build structural element of liquid characterized is additionally microinertia coefficient. In modeling properties and structures of micropolar liquid one introduced dimensionless parameter with in terminal chance conversion micropolar liquid to Newtonian liquid. The results shown on diagrams of capacity forces in dimensionless form in dependence on coupling number N2 and characteristic dimensionless length of micropolar fluid Λ1. Presented calculations are limited to isothermal models of bearing with infinite length.