Aeroacoustic investigation of an Urban-Air-Mobility ducted fan
Bibliographic record
Abstract
The present study focuses on the aeroacoustic aspects of ducted fans that could be possibly used in future Urban Air Mobility (UAM). These rotating systems are axial, low solidity rotor-stator assemblies operating in the low subsonic and transitional regime at approach. Directivity measurements of the far-field acoustic pressure have first been achieved in the anechoic wind tunnel at Université de Sherbrooke. Noise signatures with both strong tonal, quasi-tonal (subharmonic humps) and broadband components are found. Lattice-Boltzmann simulations are then performed on the same ducted fan in the anechoic wind tunnel in order to understand the noise mechanisms. Grid convergence of the acoustic spectra is already achieved. The direct farfield noise computations show a good overall match with experimental data. The origin of the subharmonic humps is already traced to the tip vortices staying in the rotational plane and interacting with the subsequent blades.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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) | 0.001 | 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 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".