Bibliographic record
Abstract
I niche market sectors such as flight-surface actuation and robotics, the demand for centralized hydraulic actuation is decreasing and has significantly fallen due to their deficiencies. These deficiencies include the requirement for a large centralized reservoir, high noise level, environmental and maintenance issues related to leaks, and low energy efficiency. As an alternative, electrical actuators in turn have their limitations that include: added friction, backlash (in geared systems), low torque/mass ratio, and increased cross-coupling effects in a multivariable context. Heavy-duty systems such as industrial robots and excavators therefore still use hydraulic actuation that offers large torque for a comparatively small final actuator size. An alternative actuation strategy that was traditionally viewed as being inaccurate is or the closed system concept. In this concept, as opposed to conventional open-circuit valve controlled hydraulics, the main component is a bi-directional pump that is directly connected to a linear or rotary actuator. In this concept, the pumping action controls the motion of the load without a need for oil reservoirs or servo-valves. Traditionally, hydrostatic circuits were used in applications that did not have stringent requirements for positional accuracy, or where energy efficiency was paramount. Since the 1990’s, the used of new computerized control methods using inner-loop feedback has led to significant improvements in their positional accuracy. Currently, hydrostatic concepts are being used in new high-power applications such as flight surface actuation. The presentation reviews the design of Electro-Hydrostatic Actuators and reports on the latest experimental results pertaining to their use in aerospace. Saeid Habibi, J Appl Mech Eng 2013, 2:3 http://dx.doi.org/10.4172/2168-9873.S1.004
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.
How this classification was reachedexpand
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".