Diffuse field sound absorption performance of porous material with embedded periodic Helmholtz resonators
Bibliographic record
Abstract
This study investigates the diffuse field sound absorption performance of acoustic metamaterial composed of a porous layer with embedded periodic Helmholtz resonators. The periodic unit cell of the metamaterial consists of a porous layer integrated with one, four and nine distinct Helmholtz resonators having extended necks. Although the resonators have cavities of the same volume, they differ in neck parameters and are arranged in parallel. The finite element method is used to evaluate the sound absorption coefficients and the surface impedance of the metamaterial under both oblique and random incidence (diffuse field) conditions. Compared to the conventional porous layer, the metamaterial exhibits significantly enhanced diffuse field sound absorption at the resonant frequencies of the resonators. With one, four and nine embedded periodic resonators, the diffuse field sound absorption shows one, four and nine resonant peaks, respectively. This metamaterial effectively attenuates low-frequency tonal noise across multiple frequencies simultaneously.
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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".