Detection of Faults in Electro-Hydrostatic Actuators Using Feature Extraction Methods and an Artificial Neural Network
Bibliographic record
Abstract
Electro-hydrostatic actuators (EHAs) are a type of hydraulic actuators which use pumps rather than valves to control the motion. As a result, they are more efficient than the valve-operated actuators. This paper presents an AI-based internal leakage detection algorithm for a single-rod EHA. Actuator internal leakage has been chosen to demonstrate the efficacy of the algorithm. Based on the sensitivity of various measures to varying levels of internal leakage, indicators are derived from the easy to obtain pressure measurements and a fault decision algorithm for quantifying the level of internal leakage in the actuator is established. This paper presents a new architecture of an artificial neural network (ANN) for detecting the existence of an internal leakage fault as labelled data. First, a sensitivity analysis is used to select a measure candidate for further research. Second, the measure chosen is analyzed using feature extraction methods. This step aims to extract hidden features to maximize the internal leakage fault detection. Finally, the fault detection algorithm classification efficiency is assessed by studying the detection rate of the proposed architecture. The experimental results show that the developed algorithm can detect internal leakage faults with 99.46% accuracy.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 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 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".