STRUCTURAL DAMPING OF SELF-ACTING COMPLIANT FOIL JOURNAL BEARINGS

This paper describes an experimental investigation into the dynamic ch aracteristics of corrugated foil (bump foil) strips used in compliant surface foil journal bearings and dampers. In the experimental method described herein, a test facility with a journal supported by a compli ant foil journal bearing was built. The nonrotating journal was driven by two shakers which were used to simulate dynamic forces acting on b ump foil strips. The dynamic structural stiffness and equivalent visco us damping coefficients are calculated based on the experimental measu rements for a wide range of operating conditions. The results are comp ared to the analytical predictions obtained by a theoretical model dev eloped earlier.