Numerical modelling of multiphase flow-induced noise and vibration in a poppet valve
Bibliographic record
Abstract
A deeper understanding of the multiphase flow-induced noise and vibration in a dynamic valve is of critical importance to the automotive industry. A two-dimensional axis-symmetric Eulerian multiphase flow model that incorporates a fluid-structure interaction capability was used to facilitate the modelling of the complicated two-phase flow through the poppet valve. The validation results provide confirmation that the model developed in this study should provide credible predictions. A spectral analysis of the transient pressure force on the poppet revealed the presence of a strong cyclical behaviour consisting of two major components: a low-frequency peak located at about 87 Hz associated with the frequency of the poppet vibration is the source of the mechanical noise, and a high-frequency peak located from about 450 to 970 Hz associated with compressibility effects and the unsteady vortex motions is the source of the turbulence noise.
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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 | 0.001 |
| 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 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".