Modelling of trench effect on fatigue performance of steel catenary riser
Notice bibliographique
Résumé
The riser-seabed interaction resulting in a trench formed in the touchdown zone (TDZ) of steel catenary risers (SCR) has a significant influence on accumulated fatigue damage. Several studies have used different trench modeling approaches to investigate the trench effect on fatigue performance of SCR. However, contradictory observations have been reported with no coherent agreement on the beneficial or detrimental effect of the trench on fatigue. In this study, the significance of trench geometry in fatigue damage evaluation was investigated. Using boundary-layer methods (BLM) and numerical approaches, a meaningful relationship was observed between the trench geometry in different zones and the peak fatigue damage. A new set of rules was proposed for the qualitative assessment of the overall trend of the trench effect on the variation of fatigue damage. The proposed assessment rules were validated by performing comprehensive numerical fatigue analysis. A comparison with samples of published experimental and numerical studies was also conducted. The developed geometrical model and the set of rules for qualitative assessment of the trench effect on fatigue were used to re-assess the majority of the key published studies. The proposed methodology resulted in a more coherent agreement between the published studies. It was observed that for the near, far, or out of the plane direction of the vessel excursions, the ultimate fatigue damage might be slightly increased or decreased depending on the probability of occurrence in different geographical locations. Instead, the trench effect appeared in the form of significant shifting of the peak damage point towards the opposite direction of the low-frequency vessel excursions. This implied that the case dependency of the trench effect on fatigue response in different geographical locations with various environmental loads was a potential source for the contradictory results reported in previously published studies. Moreover, the study revealed the significance of riser flexural rigidity and its relation with TDP oscillation on the trench surface and the fatigue damage accumulation, consequently. The peak fatigue damage depending on the trench profile was analytically obtained and showed a good agreement with numerical models. The effect of seabed soil stiffness on the fatigue performance of SCR was compared with the contribution of the trench profile in the touchdown zone. The conducted research revealed several significant trench effect on the fatigue performance of SCR and provided an in-depth insight into this challenging problem.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,001 |
| Bibliométrie | 0,002 | 0,002 |
| Études des sciences et des technologies | 0,001 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,001 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».