This document specifies the material compositions and required properties of fluid film bearings used for vehicular turbochargers. When this is compared to the opposing turbine back plane (delta) exhaust pressure on the order of 5 psig, with a net back plane area of 6.6 square inches, generating an axial force of 33 pounds towards the turbine end of the turbomachine, it is easy to see that the thrust load on the bearings will be biased toward the compressor end of the turbomachine.
However, ceramics can be polished to a smaller surface roughness than the metals, so the resulting scenario during the walking cycle is likely journal & thrust combined bearing to be the hydrodynamic regime, while the MOM and MOP implants are reasonable subjected to the mixed lubrication regime (Mattei et al., 2011).
In particular, the supporting structure may include a hardened insert at least partially interposed between the respective bearing pad and the bearing housing and an interface block at least partially interposed between the respective hardened insert and the bearing housing.
It is another object of the present invention to take advantage of the fact that the compressor discharge gauge pressure varies with the square of turbomachine speed to assure that the hydrostatically generated thrust forces are also proportional to the square of turbomachine speed.
Most bearings can be described as belonging to one of four classes: (1) rolling element bearings (examples: ball, cylindrical roller, spherical roller, tapered roller, and needle), (2) dry bearings (examples: plastic bushings, coated metal bushings), (3) semi-lubricated (example: oil-impregnated bronze bushings) and (4) fluid film bearings (example: crankshaft bearings).
It can also be seen, in the modal damping diagram of configuration A (Figure 6(b) ), that near twice the first natural frequency of the rotor (53.6 Hz) one of the fluid frequencies damping assumes a negative value, meaning that the system became unstable after the frequency of 49 Hz. This instability threshold occurs very close to the oil-whip frequency, as it can be seen in the Campbell diagram.
1. A fluid bearing for a wind turbine comprising: a bearing housing, a plurality of bearing pads inside the bearing housing and circumferentially distributed around a longitudinal axis of the fluid bearing, a plurality of supporting structures, each supporting structure having at least a first interface detachably connected to a respective seat provided in the bearing housing and at least a second interface detachably connected to a respective bearing pad of the plurality of bearing pads, wherein each supporting structure allows tilting of the respective bearing pad with respect to the bearing housing.