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Record W2007091704 · doi:10.1061/40830(188)9

SAR Membrane Tensioning

2006· article· en· W2007091704 on OpenAlex

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.

affAt least one author lists a Canadian institution in the pinned OpenAlex snapshot.

Bibliographic record

Venuenot available
Typearticle
Languageen
FieldEngineering
TopicStructural Analysis and Optimization
Canadian institutionsCanadian Space Agency
Fundersnot available
KeywordsFlatness (cosmology)MembraneTension (geology)Deflection (physics)EngineeringControl theory (sociology)Structural engineeringPhysicsComputer scienceOpticsClassical mechanics

Abstract

fetched live from OpenAlex

Synthetic aperture radar (SAR) membranes have very stringent flatness requirements. SAR antennas are designed to be perfectly flat with electrical elements at a stable position one with respect to another. Although membranes open the possibility of greater packaging possibilities and a much lower mass, these flatness and dimensional stability requirements must still be respected. Several phenomena will affect the flatness of the membrane: the quality of the tensioning system, the modes of vibration of the membrane, and the material behaviour. Past research has shown that using a pocket adopting the shape of parabola is an excellent way of uniformly tensioning a membrane. The uniform tension along one side of a membrane is needed to avoid the creation of ripples in areas where the tension would differ. This paper shows the need to take into account the slope the cable takes as it exits the tensioning pocket. If this slope differs from the slope imposed by the geometric constraints, the position of the membrane with respect to the pulley, there will be a decrease in tension in the membrane near the extremities of the pocket, and this will lead to ripples in that area of the membrane. The equation system allowing the design of a tensioning system using parabolas and taking into account the geometry of the membrane antenna and its supporting structure is described. An analysis of the first mode of the membrane shows that the deflection brought be this mode could be much larger than any creases created by a faulty tensioning system. Solutions to this problem using our current tensioning system have not been found yet, but other others have started exploring options which could be applicable to our tensioning system.

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.

Full frame distilled prediction

Teacher imitation

Not 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.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Simulation or modeling · Consensus signal: Simulation or modeling
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.220
Threshold uncertainty score0.424

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0000.000

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.

Opus teacher head0.003
GPT teacher head0.154
Teacher spread0.151 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Quick stats

Citations1
Published2006
Admission routes1
Has abstractyes

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