Systems Design and Performance of Cold Gas Microthruster for Microsatellite Attitude Control
Why this work is in the frame
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Bibliographic record
Abstract
We discuss our approach to the design and manufacturing of a cold gas micropropulsion system, using micro electromechanical systems (MEMS) devices, for an experimental attitude and orbital control system for the ALMASat microsatellite. ALMASat is a small educational spacecraft entirely designed and assembled in the aerospace laboratories of II School of Engineering of the University of Bologna. Its weight is about 12 kg, carried by a cubical bus (side 30 cm), and it is scheduled for launch from Baikonur (Kazahstan) using the DNEPR Launch Vehicle. The core of the micropropulsion system is a De Laval nozzle which accelerates the fluid, molecular nitrogen, from a plenum, through a 40 micron throat at supersonic velocity. Using the nozzle as a simple cold-gas thruster, good Isp efficiencies are demonstrated, although side-wall boundary layer contamination, no continuity effect and the limitations of MEMS fabrication technologies are clear limiting factors. The micropropulsion system consists of a high pressure tank, a pressure regulator and solenoid valves for the open/close thrusters cycles. The extruded nozzle geometry, made on silicon wafer, has been manufactured in collaboration with the Carlo Gavazzi Space (CGS) and IMM section of the Italian National Research Council (CNR) of Bologna, using a Deep Reactive Ion Etching (DRIE) technique and successive bonding.
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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