The test rig for the force coefficients of elastic ring squeeze film damper (ERSFD) was set up. ERSFD was excited by two shakers located orthogonally providing harmonic force. The results were obtained under centered circular orbit and utilized for force coefficients identification according to the orbit kinetic of the damper. The results revealed that the damping and stiffness of the film and elastic ring were both significant

the stiffness and damping of the film dropped dramatically with the increase of the height of the pedestal while the force coefficients remained almost constant. The thickness of the ring had little influence on the force coefficients of the film. The damping of the film first turned lager with the increase of feeding pressure and remained constant under high pressure while the stiffness of the film first increased and then decreased a little bit with the increase of feeding pressure. Uncertainty analysis indicates that the uncertainty of the film force coefficients Cxx

Cyy

Kxx

Kyy is 12.2%

11.5%

18.2%

12.7%

respectively while the uncertainty of the force coefficients of the elastic ring Cxx

Cyy

Kxx

Kyy is 30.7%

33.1%

17.0%

12.8%.