Experimental Validation of Tailboom Vibration Control Using Fluidic Flexible Matrix Composite Tubes
Bibliographic record
Abstract
Rotorcraft tailbooms experience driveline component wear and structural fatigue, while causing passenger discomfort due to vibration excitation from the rotors, separated flow behind the rotor hub, vehicle maneuvers, and wind gusts. Fluidic Flexible Matrix Composite (F²MC) tubes, a new class of passive fluidic vibration treatments, are tested on a representative tailboom structure. Two pairs of F²MC tubes are mounted to the top and bottom of the tailboom and interconnected via a fluidic circuit with a tunable orifice to form a tuned vibration absorber. Experimental frequency responses are obtained to demonstrate that the tuned vibration absorber reduces response amplitude at the first vertical bending mode by over 70%, and that a partially closed orifice leads to a damped absorber that adds nearly 8% damping to the first mode. A model of a tailboom with F²MC tubes is developed and validated with the experimental results. The effect of fluid pre-pressure and tailboom forcing amplitude are studied.
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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) | 0.001 | 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".