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- W4237716189 abstract "Abstract 1/2× forward whirl repeatedly occurred after a test rotor spinning at 5800 rpm was dropped onto ball bearing type auxiliary bearings (AB), utilized as a backup for magnetic bearings (MB). The measured contact forces that occurred between the rotor and the AB during the ½× subsynchronous vibration were about thirteen times larger than the static reaction force. The vibration frequency coincided with the rotor-support system natural frequency with the rotor at rest on the AB, an occurred at ½ of the rotor spin speed when dropped. The test rig provided measurements of rotor-bearing contact force, rotor orbit (vibrations), and rotational speed during rotor drop events. A simulation model was also developed and demonstrated that parametric excitation in the form of a Mathieu Hill model replicated the measured ½× forward whirl vibrations. The simulation model included a nonlinear, elastic-thermal coupled, ball bearing type AB model. The transient model successfully predicted the ½× vibration when the rotor was passing 5800 RPM as well, and the simulation results quantitatively agreed well with the test results in the frequency domain. Several approaches for mitigating the 1/2× forward whirl were presented such as adding an elastomer O-ring or waviness spring in the AB support system. Measurements confirmed that adding AB dampers effectively mitigated the ½ subsynchronous forward whirl and significantly reduced the contact forces." @default.
- W4237716189 created "2022-05-12" @default.
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- W4237716189 date "2020-02-10" @default.
- W4237716189 modified "2023-09-23" @default.
- W4237716189 title "Simulation, Test, and Mitigation of ½× Forward Whirl Following Rotor Drop Onto Auxiliary Bearings" @default.
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- W4237716189 doi "https://doi.org/10.1115/1.4045196" @default.
- W4237716189 hasPublicationYear "2020" @default.
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