Bibliographic record
Abstract
Besides the synchronous oscillations due to unbalance, high-speed rotors in oil film bearings are known to show whirl/whip instabilities which exhibit various types of subsynchronous oscillations. Here, the methods of numerical continuation are applied to study the subsynchronous oscillations in detail. The main scope is to analyze the stability and bifurcation behavior of the unbalanced Laval/Jeffcott rotor supported in semi-floating ring bearings. Characteristic bifurcation scenarios prove the existence of two different types of Hopf bifurcations which represent whirl/whip instabilities due to the inner or the outer oil films. Furthermore, it is shown that the critical limit cycle of non-tolerable amplitude is born at a saddle-node bifurcation. Finally, the influence of unbalance on the subsynchronous oscillations is investigated by tracing the occurring bifurcations in the parameter plane of the unbalance load and the rotor speed. The obtained bifurcation curves provide extended stability charts which illustrate the global solution behavior of the considered rotor bearing systems.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.004 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".