Abstract: A dual-film damper has a housing defining an annular damper fluidly connected to a source of pressurized oil. First and second damper rings are coaxially nested within the damper cavity. A first set of spacers allows for the formation of a first oil film annulus between the first and second damper rings. A second set of spacers allows for the formation of a second oil film annulus between the second damper ring and the housing. The first and second oil film annuli have a thickness-to-length ratio (T/L) selected to provide a desired damping capacity.

Abstract: A dual-film damper has a housing defining an annular damper fluidly connected to a source of pressurized oil. First and second damper rings are coaxially nested within the damper cavity. A first set of spacers allows for the formation of a first oil film annulus between the first and second damper rings. A second set of spacers allows for the formation of a second oil film annulus between the second damper ring and the housing. The first and second oil film annuli have a thickness-to-length ratio (T/L) selected to provide a desired damping capacity.

Abstract: A fluid damping structure is provided that includes an inner annular element, an outer annular element, a first outer seal, a second outer seal, an inner seal, a damping chamber, a supply plenum, a fill port, and a plurality of fluid passages. The plurality of fluid passages is disposed in at least one of the inner annular element or the inner seal. The fluid damping structure is configured such that one or more of the fluid passages is disposed in an open configuration when a local damping fluid pressure within the damping chamber is less than a local damping fluid pressure in an adjacent region of the supply plenum, and the one or more of the fluid passages is disposed in a closed configuration when the local damping fluid pressure within the damping chamber is greater than the local damping fluid pressure in the adjacent region of the supply plenum.

Abstract: A fluid damping structure is provided that includes an inner annular element, an outer annular element, a first outer seal, a second outer seal, an inner seal, a damping chamber, a supply plenum, a fill port, and a plurality of fluid passages. The plurality of fluid passages is disposed in at least one of the inner annular element or the inner seal. The fluid damping structure is configured such that one or more of the fluid passages is disposed in an open configuration when a local damping fluid pressure within the damping chamber is less than a local damping fluid pressure in an adjacent region of the supply plenum, and the one or more of the fluid passages is disposed in a closed configuration when the local damping fluid pressure within the damping chamber is greater than the local damping fluid pressure in the adjacent region of the supply plenum.