Dynamic design method of elastic ring squeeze film damper

A high efficient oil film damper which is known as elastic ring squeeze film damper (ERSFD) has special dynamical characteristics based on the conventional squeeze film damper (SFD). The characteristics of a gas turbine engine with ERSFD including the supporting stiffness of the elastic ring, the distribution of pressure field and oil film damping were investigated by taking advantage of the elastic deformation of the elastic ring. For ERSFD, finite element method not only has the advantages of simple modeling and small computation work, but also can be used in appropriate boundary conditions, for various damper sealing configurations. It was indicated that the calculative methods and results were put forward contributing to the preliminary design modification of the current body structure. Compared with SFD, the oil film clearance of ERSFD is divided into several parts. It can automatically adjust the oil film clearance by taking advantage of the elastic deformation of the elastic ring, which controls the oil film clearance in a suitable range. ERSFD has optimal effect on reducing nonlinear vibration markedly.