Experimental hydrodynamics and simulation of manoeuvring of an axisymmetric underwater vehicle
Notice bibliographique
Résumé
Experimental study of the hydrodynamics of an underwater vehicle requires state-of-the-art facilities, precise design of the experiment and careful analysis of the results. This thesis presents hydrodynamic observations resulting from experiments that were performed on a series of five bare-hull configurations of slender axisymmetric underwater vehicles and also reports a simulation code to predict the manoeuvring behaviour of a real underwater vehicle: MUN Explorer. The main aim is to find the correct form of the physically-based expressions for the hydrodynamic loads that are exerted on completely-submerged underwater vehicles during various manoeuvres and use this improved knowledge to obtain a better prediction of the manoeuvring of an underwater vehicle. -- Straight-ahead resistance tests and static-yaw runs up to 20 degrees yaw angle for the axisymmetric bare-hull configurations that were performed in the 90 metre towing tank at the Institute for Ocean Technology, National Research Council, Canada, provided empirical formulae for the drag force, side force and turning moment that are exerted on such axisymmetric torpedo-shaped hull forms. The empirical formulae were then embeded in a numerical code to simulate the constant-depth planar manoeuvres of the MUN Explorer AUV. The simulation code was first calibrated using the sea-trials data, and then was used to study the turning manoeuvres and compare the simulation results with theoretical formulae based on the linearized equations of motion. -- Dynamic captive-model tests including pure sway and pure yaw runs were the other part of the experiments on the five bare-hull configurations. The sway force that is exerted on the bare-hull during lateral accelerations, according to the pure sway test data, was observed to have a variation over manoeuvring frequency and amplitude. Also, empirical formulae were proposed to estimate the magnitude and phase of the hydrodynamic loads: sway force and yawing moment that are exerted on the axisymmetric torpedo-shape bare-hull of an underwater vehicle during a rapid zigzag manoeuvre. -- Finally, in order to obtain further insight into the origin and distribution of the hydrodynamic loads during underwater manoeuvres, pressure measurement experiments were proposed and as an initial step towards the aim of performing such measurements over the surface of an underwater vehicle, a re-analysis of the old airship data was presented. The re-analysis of the airship pressure test results provided an estimate of the normal pressures that may be experienced by an underwater vehicle during manoeuvres.
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 | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,002 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,001 |
| 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 ».