A broadband sound absorption resonator made of acoustic black hole
Bibliographic record
Abstract
In this paper, an acoustic resonator designed for broadband sound absorption is proposed. The resonator features a neck that extends into the cavity, forming a sonic black hole. This design incorporates a central pore profile that decreases linearly across a series of interconnected annular cavities. The radii of the necks connecting these cavities progressively decrease from the inlet, while the resonator's wall is considered rigid. The finite element method is used to calculate both the sound absorption coefficient and the surface impedance of the proposed resonator. When the neck comprises fifteen annular cavities, the sound absorption coefficient exhibits fifteen different resonant peaks. By reducing the thickness of each annular cavity to approximately 1 millimeter, a broadband sound absorption coefficient is achieved with a surface impedance closely matching that of air. The proposed resonator demonstrates very good performance in noise attenuation across a wide frequency range, making it a promising solution for effective noise insulation in various applications.
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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 | 0.001 |
| 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".