Identification of Dynamic Stiffness of Squeeze Film Damper Using Active Magnetic Bearing System as an Exciter

摘要

The dynamic characteristics of an oil-lubricated, short squeeze film damper (SFD) with a central feeding groove are derived based on a theoretical analysis considering the effect of the groove, and identified experimentally using an Active Magnetic Bearing (AMB) system as an exciter. In order to get the theoretical solution, the fluid film forces of the grooved SFD are analytically derived so that the dynamic coefficients of the SFD are expressed in terms of its design parameters. For the experimental validation of the applied analysis, a test rig using an AMB as an exciter is proposed. Using this test rig, a number of experiments are extensively conducted with different values of clearance in order to investigate its effect on the dynamic characteristics and the performance of the SFD. Damping and inertia coefficients of the SFD experimentally identified are compared with the analytical results to demonstrate the effectiveness of the analysis. It is also shown that the AMB is an ideal device for tests of SFDs.