Enhancing low-frequency transmission loss in aircraft fuselage sidewalls with a flat array of covered Helmholtz resonators metamaterial
Why this work is in the frame
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Bibliographic record
Abstract
This paper explores the use of a flat array of covered Helmholtz resonators (CHRs) as a metamaterial for enhancing the acoustic transmission loss (TL) of aircraft fuselage sidewall. The benefits of CHRs are twofold: (i) decreasing the Helmholtz resonance frequency, thereby targeting lower frequencies, and (ii) providing precise control over the resonant frequency of the metamaterial when integrated into a fuselage sidewall. In this paper, we first examine the vibroacoustic behavior of a single CHR, observing a significant decrease in resonant frequency as the covering plate approaches the neck entrance. Subsequently, we evaluate arrays of CHRs, with different filling factors, and their impact on the TL of an aircraft fuselage sidewall. Placing the CHRs metamaterial in the dead space between stringers improves the TL by up to 10 dB at the panel's ring frequency, demonstrating their potential for low-frequency noise reduction in aircraft.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.000 | 0.001 |
| 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