Externally pressurized gas bearings: A comparison between two supply holes configurations

Dynamic Characterization of Rubber O-Rings: Squeeze and Size Effects

“…(1) to identify stiffness and damping properties of O-rings of general size which could be used to study the stability of gas bearings, which are prone to whirl instability [21] or to pneumatic hammer instability. These coefficients could be inserted in lumped parameters models of gas bearings [22][23][24] to evaluate their increased stability thanks to the use of the O-rings.…”

High Speed Rotors on Gas Bearings: Design and Experimental Characterization

“…The rotor trajectory is determined starting with the initial static pressure distribution and using the following set of initial conditions: The whirl stability can be verified with the orbit method [18,32], that considers the nonlinearities of the problem.…”

Comparison between Different Supply Port Configurations in Gas Journal Bearings

“…The three bearing types were comparable in terms of stiffness and damping coefficients, air consumption and stability. In (Colombo et al, 2009) the authors compared bearing types 1 and 2 (see figure 1) considering the same supply port diameter d s . The bearing with double array entries (bearing type 2) was found to be 30% stiffer than the one with a single central array (bearing type 1) but the air consumption was two times as much.…”

“…Results show that the stability threshold is better with six-ports than with three ports. In (Colombo et al, 2009) the authors analysed two externally pressurized gas bearings, one with a central row of supply orifices, the other with a double row. The supply port downstream pressure was found to be proportional to the critical mass.…”