Synthesis and Experimental Validation of Two-Step Variable-Structure Control of a Micro-Actuated Flow Effector
Why this work is in the frame
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Bibliographic record
Abstract
To achieve fast and agile missile flight, carefully designed micro-actuated flow effectors relying on smart structures is a promising technology thanks to their compactness and lightweight properties. Indeed, micro-actuated flow effectors are ideal candidates to carry out active flow control. Such effectors can be mounted on a compliant mechanism and be actuated by means of antagonistic shape memory alloy (SMA) wires. This paper proposes a variable-structure control law for such micro-actuated flow effectors which is designed with the objective of controlling flow effector positions over a range of 1 mm and within a bandwidth of [0.1 Hz, 1 Hz]. A bang-bang controller is used to guarantee fast decaying transients and performance robustness with respect to modeling uncertainties. When the tracking error is less than a prescribed threshold, stabilization without chattering is achieved by switching from the bang-bang control law to a linear digital control law, whose design is based on the parametric identification of the entire mechanical device composed of the antagonistic actuation, of the compliant mechanism, and of the micro-actuated flow effector. The rate independent hysteresis, which is typical of SMA, is represented as an input-output phase lag and is thus taken into account in the control design. Experimental results show that the control law is capable of providing effective control up to 1.0 Hz.
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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 | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.000 | 0.005 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.003 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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