Experimental Characterization of a Small-Scale Tailboom with Fluidic Flexible Matrix Composite Tubes
Bibliographic record
Abstract
Rotorcraft tailbooms vibrate due to excitation from the rotors, separated flow behind the rotor hub, vehicle maneuvers, and wind gusts. They also typically have low inherent structural damping. This vibration leads to driveline component wear, structural fatigue, and passenger discomfort. Fluidic Flexible Matrix Composite (F2MC) tubes, a new class of passive vibration treatments, are attached to a representative tailboom structure and experimentally tested. Each F2MC tube consists of a stainless steel mesh surrounding a rubber tube. The mesh and tube are independently fastened to end fittings that mechanically connect and fluidically seal the F2MC tubes, respectively. Two tubes are mounted to the top and bottom of the tailboom and interconnected with a fluidic circuit that can be pressurized. Tests are performed to measure the fluid volume pumped by the F2MC tubes when the tailboom bends, and the tailboom displacement in response to F2MC tube pressurization. Experimental results demonstrate that the F2MC tubes can actuate tailboom bending and pump fluid. The actuation and fluid pumping results agree well with theoretical predictions. Numerical simulations, based on a previously developed model, have indicated potential for F2MC tubes to provide an efficient means of introducing useful levels of damping into tailboom structures. Characterization of the dynamic performance is ongoing.
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How this classification was reachedexpand
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".