Influence of orifice distribution on the characteristics of Elastic Ring Squeeze Film Dampers for Flywheel Energy Storage System

This paper analyses the influence of orifice distribution on the damping characteristics of Elastic Ring Squeeze Film Dampers (ERSFD) for Flywheel Energy Storage System (FESS). Finite element method is employed to calculate the oil-film force of the ERSFD with different orifice distribution. The relationship of the oil-film force versus the orifice location in both axial and circumferential direction is drawn. The principle for the optimum orifice location is summarized, verified via varying the orifice radius. It is shown that orifices with the optimum distribution can play the greatest role in adjusting the damping coefficient, providing guidelines for the design and application of ERSFD.