Non-synchronous vibration due to internal radial clearance in roller bearings
Bibliographic record
Abstract
Non-synchronous vibration is a common phenomenon in rotor-bearing systems which causes cabin comfort issues in mid size business jets. In rotating systems, the most significant source of non-synchronous vibration is the nonlinear contact in supporting bearings which is affected by internal radial clearance, contact materials, roller numbers and mass imbalance, etc. In this study, a Jeffcott rotor-bearing system is modeled using the finite element method. For solutions of the system's governing equations, both the time-marching technique and harmonic balance method are used. Moreover, a modal reduction technique is applied to save the computations. For bearing contacts, three treatment approaches are adopted: the Hertz theory, the Lagrange multipliers technique and the forcing functions. Finally, the non-synchronous vibration is investigated with respect to the bearing's parameters, and the internal radial clearance is proven to play the most significant role in controlling the non-synchronous vibration.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".