Wind turbine control using a gearless epicyclic transmission
Bibliographic record
Abstract
A recurrent problem in energy production by means of wind turbines is how to keep a constant angular velocity at the shaft driving the alternator in the presence of a randomly varying turbine angular velocity. The latter is caused by the random nature of the wind velocity. Proposed in this paper is an innovative two-degree-of-freedom mechanism, with the morphology of a differential gear train, but without gears. The latter are replaced by cam-roller pairs, which offer many advantages over gears: low friction, low backlash and much higher stiffness. The mechanism, dubbed pitch-roll wrist, was originally developed as a robotic wrist for pitch-roll generation. It is shown in the paper that the mechanism can effectively control its pitch velocity in the presence of a randomly varying angular velocity, which emulates that produced by wind on the shaft of a wind turbine. The pitch velocity, in turn, emulates that of the shaft driving the alternator. The control algorithm, based on a PID controller, was tested on an experimental testbed. Results show an effective angular velocity control.
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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 | 0.000 | 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 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
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".