Optimization of secondary suspension of three-piece bogie with bevelled friction wedge geometry
Why this work is in the frame
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Bibliographic record
Abstract
The multibody approach is utilized to investigate the dynamic characteristics of the modified friction wedge geometry in the secondary suspension of a freight wagon with three-piece bogies. In proposed design, each wedge is simulated with six Degrees of Freedom with corresponding geometry and inertial properties. The geometry of wedge as well as wedge angle, toe-in condition, and clearances between wedge and bolster/side frame are considered in modelling by point–plane contact technique. The contact model considers unilateral contact and non-smooth frictional forces. The three-dimensional model of the wedge simulates a frictional damping system that interacts with bolster in two separate inclined surfaces, longitudinally and horizontally. The optimum inclination angles are determined to reduce the carbody vertical acceleration and normal wheel–rail contact force subject to a track deviation for empty and loaded conditions. Moreover, the dynamic response of the freight wagon with optimal wedge geometry presents qualitative improvements regarding stability, hunting speed, and derailment probability in comparison with the conventional geometry of wedge.
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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 | 0.001 |
| 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