Optimization of Band Gap Area in the Low-Frequency In-Plane Elastic/Acoustic Passive Adaptive Metamaterial
Bibliographic record
Abstract
View Video Presentation: https://doi.org/10.2514/6.2023-2123.vid The present research aims to enhance and control bandgaps in a periodic metamaterial of square shape by adding a cylindrical core to the center of the conventional geometry and changing its arm angles. The base unit cell was unable to exhibit bandgaps mainly due to uniform mass distribution in the unit cell. The introduced modified unit cell incorporating a cylindrical core at the center with isosceles trapezoid arms permitted the generation of new bandgap areas capable of attenuation of propagating waves in desirable frequency ranges. Bloch's theorem and finite element method with periodic boundary conditions are employed to analyze the band structure and also to investigate the effect of unit cell geometrical parameters on the low-frequency band gap area. The present research outcomes may provide an essential guide to designing architected periodic filters with the ability to attenuate low-frequency elastic/acoustic vibrations.
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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 | 0.000 |
| 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) | 0.001 | 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".