An additional configuration to standard ASTM E2611-09 for measuring the normal incidence sound transmission loss in a modified impedance tube
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Bibliographic record
Abstract
This paper presents a three-microphone two-load (3M2L) method for measuring the normal incidence sound \ntransmission loss of a noise control system or material in a modified impedance tube. In the standard ASTM \nE2611-09, the downstream section of the impedance tube includes two microphones flush with the interior \nsurface of the tube and the proposed four-microphone two-load (4M2L) method to assess the normal incidence \nsound transmission loss requires the use of two arbitrary acoustic terminations. The method presented here is \nconceptually identical but (i) the downstream section is reduced to a simple movable rigid backing with one \nmicrophone flush mounted on it and (ii) the two arbitrary acoustic terminations are replaced by two air cavities. \nIt thus requires one microphone less and fewer transfer functions. The standard switching technique used to \ncorrect the variations between the three microphones is validated on a symmetrical air layer. The proposed \n3M2L method is then applied to a non-symmetrical specimen and validated compared to the standard 4M2L \nmethod.
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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 | 0.001 | 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