Static and dynamic characteristics of centre pivot five pad tilting pad journal bearings: addendum
Bibliographic record
Abstract
This report presents experimental results, which supplement those described in the report from the previous study on the Pocket Feed tilting pad journal bearing1. The Addendum consists of the following two tasks: • measurements of the static and dynamic characteristics of the centre pivot bearing for load-between-pads (LBP) and load-on-pad (LOP) orientations, a bearing load of 3.82 kN (858 Ibf) and a range of speeds up to 16,500 rpm. • measurements of combined pad pivot and shell deflections. These tasks were carried out on the same bearing as was used in the previous study. The test bearings have a diameter of 0.0889m (3.5 in), L/d ratio of 1.0, and pads with centre pivots. They have been tested with load between pads (LBP) and load on pad (LOP) orientations. The shaft speed ranged between 2000 and 16500 rpm, and the bearing load was 3.82 kN (858 Ibf). The following operating parameters have been measured: • bearing operating temperature • power loss • displacement of bearing centre • stiffness and damping coefficients. Apart from providing the bearing characteristics for the shaft speed beyond the previously used range, the measurements showed a very good repeatability of both the steady state and dynamic results. The measurements of the pivot deflection do not show any hysteresis. For the loads on pad up to 2500 Ibf the measurements agree well with the predictions. However, at the higher loads, the formulae overestimate the pivot deflection (underestimate pivot stiffness).
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.008 | 0.002 |
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".