Design of Digital Displacement Pump Systems With Multiple Pumps
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Bibliographic record
Abstract
Abstract Digital Displacement Pumps (DDPs) are hydraulic pumps which operate on the concept of enabling or disabling individual pistons of a radial piston pump. This allows for the combination of the high efficiency of radial piston designs with the flow control capability of a variable displacement design. In the most efficient mode, where each piston is fully enabled or disabled for an entire stroke of the piston, this results in a pulsing flow at the pump outlet. In some cases, this can result in undesirable levels of pressure pulsation with associated noise, vibration, and harshness. In previous work it has been shown that the design of the hose or piping immediately downstream of the pump can have significant effects on this pressure ripple. In this paper we expand this work to systems with two or more pumps in parallel. We present results comparing “star” and “rail” connection configurations and study the effects of line lengths and stiffness on generated pressure ripple. Simulation results are used to develop simple equations approximating resonance frequencies. Finally, we present guidelines for design of multi-pump DDP systems.
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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 | 0.000 |
| 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 it