Acoustic Atmospheric Propagation Model Validation with the NRC Convair 580
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
The National Research Council Canada was tasked to concurrently assess the visibility and audibility of aircraft in the vicinity of low-traffic aerodromes. This paper discusses the efforts to numerically estimate the acoustic propagation of an aircraft’s acoustic signature using the Impedance Plane Formulation and the Fast Field Program. The experimental methodology includes the measurement of lowaltitude aircraft fly-by acoustic spectra as reference data and high-altitude aircraft fly-by acoustic spectra as target data for the acoustic propagation models. It is shown that the selected acoustic atmospheric propagation models are able to accurately estimate certain frequency components of the acoustic spectra for low and high altitudes of flight of the Convair 580 aircraft. Signature aircraft tones located at 70 Hz and 140 Hz are identified by the models and accurately estimated in location and amplitude. The models’ performance is evaluated to a range of 8 km in the horizontal plane and 3.66 km in altitude; the models exhibited reduced performance as a function of distance. A rudimentary subjective analysis was completed to inform future work; results were consistent with the objective analysis.
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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 | 0.000 | 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 it