Numerical Calculation of Radial Sliding Bearing Dynamic Characteristics at a High Speed

Along with the machine to high speed, large scale, power direction and effects of fluid boundary slip, More and more journal bearings operate in turbulent regime. the conventional finite difference method adopted to derive oil-film dynamic coefficients of aerostatic bearings call the Reynolds equation for four times, Only unit division is fine enough in order to achieve the desired accuracy, the unsteady renolds equation has to be solved generally by the method which are rather time consuming in the nonlinear dynamic analysis of sliding bearing. in the paper, the theory of variational inequality and the method dimension-reduction were used to calculate oil-film forces and the dynamic coefficients of journal under the turbulent regime MeaIlwhile some effective techniques are used to save the computing time. which can well reveal the nonlinear dynamic characteristics of journal bearing of the complex turbulent flow conditions. The numerical results show that compared with the results of the finite difference method´s algorithm and CFD software´s using base on dynamic mesh model the computing time of this algorithm can be saved more than 99% under the precision guaranteed.