Stiffness and damping characteristics of highly accurate rock simulation system based on gas–liquid coupling mechanism under nonharmonic impact
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Bibliographic record
Abstract
To address the issue of the performance testing of hydraulic rock drills under specific working conditions, a stiffness–damping multi-stage adjustable rock simulation system has been proposed. Firstly, based on Kelvin rock theory, a rock vibration model under nonharmonic excitation is established. An integer-order model of the simulation system is created based on fluid mechanics theory. The stiffness–damping characteristics of granite and the system are studied, discussing the influencing factors of the stiffness–damping characteristics. Next, a drop hammer calibration experiment and an impact drilling experiment for the simulation system are designed. Finally, the stiffness–damping characteristics of the system in actual drilling are investigated, validating the effectiveness of the numerical model. Model simulations show that the smaller the stiffness of granite and the simulation system, the larger the drilling displacement. The larger the damping coefficient, the smaller the drilling displacement. Lower initial gas pressure and volume of the accumulator can provide greater stiffness. The greater the preload of the overflow valve and the cylinder diameter, the greater the damping produced. The experimental results show that the stiffness–damping error between the system and the granite does not exceed 10% with exceptionally high accuracy.
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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 | 0.001 |
| 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)
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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