Identification of the rotor dynamic coefficient of a squeeze film damper with dilatant fluid

Abstract

Dilatant fluids exhibit a sudden increase in viscosity when the shear rate increases. This characteristic can be used in the design of bearings that can suppress vibrations in the event of a sudden increase in shear rate, such as in rotating machinery. The bearings for rotating machines are designed based on a model that uses dynamic coefficients of the rotor. Therefore, in this study, the bearing coefficients of a squeeze film damper (SFD) using a dilatant fluid were experimentally determined. These characteristics were compared with those of a typical SFD using oil.