New experimental and theoretical methods to model perforated plate in the presence of grazing airflow
Why this work is in the frame
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Bibliographic record
Abstract
While perforated plates are commonly used in mufflers to attenuate exhaust noise, the relationship between their design parameters, such as hole size and percentage open area, and their acoustic performance, particularly at high sound pressure levels and strong airflow conditions, is not fully understood. This study presents an experimental method to investigate how airflow affects the transfer impedance of these plates. By testing different plate designs (5% to 40% open area) and airflow conditions (0.03 to 0.15 Mach), a new theoretical impedance model to predict their acoustic performance is proposed and tested by comparing the predicted transmission loss with existing models and measured values. The proposed model showed superior accuracy in predicting transmission loss across a wide range of plate designs (5% to 40% open area), demonstrating its potential effectiveness in optimizing muffler performance.
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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 | 0.000 | 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 | 0.001 |
| 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