Evaluation of pilot whole-body vibration exposure levels on a CH-147F Chinook military helicopter
Bibliographic record
Abstract
Flight testing has been performed on a Royal Canadian Air Force (RCAF) CH-147F Chinook helicopter to measure pilot whole-body vibration exposure levels during representative flight conditions. Vibration data have been analysed in accordance with the ISO2631-1:1997 standard. The results showed that the helicopter cabin vibration was mainly introduced by the aerodynamic loads at N/rev harmonics of the three-bladed tandem rotor speed. The pilot whole-body vibration levels varied significantly depending on flight conditions and aircraft load configurations. The highest vibration levels occurred during manoeuvres and high speed flight. Referencing to the guidelines in ISO 2631-1:1997, the pilot whole-body vibration exposure level in the tested flight profile were rated as “uncomfortable”, and the maximum duration of such a mission should be limited to 1.0 or 3.3 hours depending on the lower or upper limit of the Vibration Health Guideline Caution Zone respectively. The results of a subjective analysis, by the pilot, of the comfort levels during the flight did not provide good correlation with the level of discomfort indices measured during the tested flight profile.
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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 | 0.001 |
| 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) | 0.002 | 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".