Abstract
The stability characterisitics of radially unloaded herring-bone grooved gas journal bearings are numerically analyzed by taking the angular mode bearing mechanical impedance into consideration. The influences of the construction of the rotating system and the effects of the polar mass moment of inertia of the rotor on the conical mode stability are discussed. Results show that the rotating system suspended by two bearings with a long span is fairly advantageous for the conical mode stability compared with the system suspended by a bearing. Also, it is found that the polar mass moment of inertia has great effects on suppressing the conical mode instability.
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