An Experimental Analysis of Second-Order Roll Motions of New Generation FPSOs
Bibliographic record
Abstract
Abstract Floating Production, Storage and Offloading (FPSO) units represent the main type of platform adopted nowadays for oil & gas production offshore Brazil. Since the first versions in the early 1990s, the FPSOs designed to operate in deep water fields underwent several modifications, and, more recently, those of the new generations are characterized by a significant increase of hull size and topside weight. One of the consequences of this increase in the FPSOs size are the higher values of their natural periods of roll motions, making them more susceptible to (low-frequency) resonant motions induced by waves. The present work brings more details on a set of experimental results designed to evaluate the difference-frequency roll motions of a small-scale model with geometry and mass distribution within the range representative of the new FPSO units. The main objective of the tests was to provide the basis for the verification of the predictions obtained by numerical models that are often used for the units’ seakeeping analysis. Besides identifying the resonant roll motions induced by second-order wave effects in the experimental records, some preliminary comparisons are presented with computational predictions. Results show that a reasonable level of adherence may be obtained, notwithstanding the well-known limitations of the numerical procedure.
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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 | 0.001 |
| 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) | 0.003 | 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".