Modeling and experimental characterization of a tethered spherical aerostat
Why this work is in the frame
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Bibliographic record
Abstract
Tethered helium balloons are known to be useful in applications where a payload must be deployed at altitude for a long duration. Perhaps the simplest such system is a helium-filled sphere tethered to the ground by a single cable. Despite its relative simplicity, there exists little data about light tethered spheres in a fluid stream. The current work focuses on an investigation of the dynamic characteristics of a spherical aerostat on single tether. A test facility was constructed to gather the experimental data required for a characterization of the system. The balloon's drag coefficient is extracted from the position measurements. Our experiments were all in the supercritical range that is, at Reynolds numbers greater than 3.7 x 105. We find that the balloon's large oscillations and surface roughness combined with the wind turbulence result in a substantial increase in the drag coefficient. A model of the dynamics of a spherical aerostat was previously developed at McGill University and our experimental data was used to refine and improve that simulation. The aerostat is modeled as a single body attached to the last node of a tether. It is subject to buoyancy, aerodynamic drag and gravity. The tether is modeled using a lumped-mass method. The dynamic simulation of the aerostat is obtained by setting up the equations of motion in 3D space and integrating them numerically. Finally, the model is validated through comparison with experimental data and a modal analysis is performed.
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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