Abstract: The elastic ring squeeze film damper(ERSFD) combines the advantages of squeeze film damper(SFD) and the elastic support, and its structure is more compact. In order to further clarify its dynamic mechanism, the bidirectional fluid-solid interaction numerical solution model of ERSFD is established considering the interaction between oil and elastic ring. The simulation on the dynamic characteristics of ERSFD are carried out when the width, height, number, and elastic modulus of the elastic ring are different. It is found that the outer oil film makes more contribution to the stiffness, and the inner oil film makes more contribution to the damping. It can be seen that the relatively small inner oil film clearance and the relatively large outer oil film clearance are beneficial to increase the oil film damping and restrain the nonlinearity of oil film stiffness. As the boss width, boss height, boss number, or elastic modulus of the elastic ring increases, both the inner and outer oil film stiffness and damping increase, nevertheless, the influence of elastic modulus of the elastic ring is relatively small. This study will provide a reference for the design, use and maintenance of ERSFD.

Key words: elastic ring, squeeze film damper, bidirectional fluid-structure interaction, stiffness, damping