Dynamic Characteristics of Hydrostatic Active Journal Bearing of Four Oil Recesses

Abstract

More and harsher operational environment of spindle puts forward higher requirements for the performance of bearings. It is no longer suitable for the traditional journal bearing to work in the conditions above. In order to meet the requirements of high speed and heavy haul operation, the article presents servo-valve active compensation to realize accurate control of spindle position accuracy and improve the behavior of hydrostatic journal bearings. By regarding the journal bearing as an automatic control system in the process of modeling, the dynamic equation and flow continuity equation for the proposed bearing were derived. The dynamic characteristics of the proposed journal bearings and the traditional journal bearings were studied in the operational environment of high speed and heavy duty. The numerical results indicate that the proposed hydrostatic active journal bearing has good performances, including good controllability and stability, fast response, high stiffness, strong resistance, etc., compared to traditional journal bearings. The use of active lubrication with servo-valve controller results in a significant amount of amplitude reduction and greatly improves the positional accuracy of the spindle. Therefore, it has the potential application in heavy-haul and high-speed machinery.