Development of a Multi-Axis Active Seat Mount System for Helicopter Aircrew Whole-Body Vibration Mitigation
Why this work is in the frame
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Bibliographic record
Abstract
View Video Presentation: https://doi.org/10.2514/6.2021-1835.vid This paper presents the development and evaluation of an actively controlled multi-axis helicopter seat mount system for aircrew whole-body vibration mitigation applications. The multi-axis seat mount system is designed to be installed between the helicopter seat floor and the supporting structure of seat frame to minimize the impact on the crashworthiness requirements of the helicopter seat. The active seat mount was designed to incorporate multiple miniature force actuators to counteract the vibrations transmitted from the helicopter floor to the seat frame and aircrew in three orthogonal directions. The actuators are controlled by an adaptive feedforward filtered-x Least Mean Square (LMS) algorithm to cancel the helicopter floor vibration input. The prototype active seat mount design has been tested with a Bell-412 pilot seat and three Hybrid III manikins, with a shaker table to provide representative Bell-412 helicopter vibration profiles. Test results demonstrated that the vibrations of the seat frame and manikin occupant were suppressed simultaneously, and the occupant whole-body vibration related to the major N/rev harmonic peaks were reduced by 90%. This demonstrated that the multi-axis active seat mount design has the potential to mitigate the whole-body vibration exposure of the helicopter aircrew to improve their ride quality and reduce vibration related adverse health effects.
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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 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it