In general, the oil-film forces can be characterized by linear oil-film coefficients of hydrodynamic bearing. This paper proposes an experimental method to recognize the dynamic coefficients of a water lubricated high-speed hybrid bearing with stepped recesses. A test rig is constructed and experimental data are acquired under different conditions. And the unbalance responses method is used to identify the dynamic coefficients of the hybrid bearing system. Comparisons are made to verify the validity and accuracy of the theoretical analysis. The influence of operating parameters, such as supply pressure and rotating speed, on the dynamic coefficients of the system is discussed. The results indicate that the dynamic coefficients increase with the rotating speed when the supply pressure is low.

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