Influence of Bearing Wear on the Stability and Modal Characteristics of a Flexible Rotor Supported on Powder-Lubricated Journal Bearings

This study has investigated the influence of journal bearing wear on dynamic behaviour a flexible rotor with central disc. Rotors supported bearings are susceptible to self-excited whirling, leading unstable conditions. Prior knowledge stability limit speed is important avoid excessive vibration rotating machines. For in this paper, were lubricated powder owing high-temperature applications where conventional oil lubricants would fail perform. The governing equations for lubrication derived using simplified grain theory based dense gases. shaft was discretized considering Timoshenko beam elements. Modal analysis conducted obtain system’s natural frequencies, mode shapes, damping factors, speed, and unbalance response. also evaluated depth system found that significantly affects stiffness characteristics lubricating film. Consequently, free forced affected. It been increased improves but little