Experimental Characterization and Simulation of a Tethered Spherical Helium Balloon in an Outdoor Environment
Bibliographic record
Abstract
This paper focuses on an investigation of the dynamic characteristics of a spherical aerostat on a single tether. A portable test facility was constructed to gather experimental data required to characterize the system. All experiments were in the supercritical range, at Reynolds numbers greater than 3.7 × 10. The balloon’s drag coefficient was determined based on position measurements. The balloon’s large oscillations and surface roughness, combined with the wind turbulence, resulted in a substantial increase in the drag coefficient. To further study the system, a numerical simulation was developed. The aerostat is modeled as a rigid body attached to a tether, and is subject to buoyancy, aerodynamic drag and gravity. The tether is modeled using a lumped-mass approach, while includes stiffness and damping. The dynamics simulation of the system is obtained by formulating the equations of motion of the aerostat and the cable nodes in 3D space and integrating them numerically. The simulation is then validated by comparing its results with experimental data. Finally, a modal analysis of the natural modes of the system is performed.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".