Critical Speed
The purpose of undamped critical speed map is to check the bearing stiffness briefly at initial design stage, and it could be used to expect the rotor’s behavior & sensitivity around its critical speed. The intersection between bearing stiffness and each critical speed should be checked in order to determine if the designed equipment is stiff rotor or soft rotor. It should be noted that the undamped critical speed map shall not be used to assess the rotor reliability, as the bearings are estimated in absent of their damping and the aerodynamic cross-coupling for each impeller does not also included in this analysis.
Mode Shape
Mode shape provides the approximate displacement of rotor relatively around critical speed, and it is determined that the unbalance location with phase is applied for response analysis.
Unbalance Response (Imbalance Response)
As one of rotordynamics analysis, Damped unbalance response analysis is performed to check the adequate separation margin between critical speeds and operating speeds, as well as to check internal clearance limitation against rubbing, etc.
INERTANCE has a capability regarding noise and vibration engineering, and our experts are familiar with assessment of Lateral Vibration (Rotordynamics) Analysis. For further information, contact us at (mountain@inertance.com).
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