dc.contributor.author | Θεοχάρης, Κωνσταντίνος | el |
dc.contributor.author | Theocharis, Konstantinos | en |
dc.date.accessioned | 2016-04-12T09:12:40Z | |
dc.date.available | 2016-04-12T09:12:40Z | |
dc.date.issued | 2016-04-12 | |
dc.identifier.uri | https://dspace.lib.ntua.gr/xmlui/handle/123456789/42371 | |
dc.identifier.uri | http://dx.doi.org/10.26240/heal.ntua.9931 | |
dc.rights | Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/gr/ | * |
dc.subject | Συγκόλληση | el |
dc.subject | Ανεμογεννήτριες | el |
dc.subject | Συνδέσεις | el |
dc.subject | Πυλώνες | el |
dc.subject | Εναλλακτικοί τρόποι | el |
dc.subject | Welding | en |
dc.subject | Wind turbines | en |
dc.subject | L-stub connections | en |
dc.subject | Alternative welding details | en |
dc.subject | Wind turbine towers | en |
dc.title | Αξιολόγηση εναλλακτικών τρόπων συγκόλλησης σε συνδέσεις βραχέος L πυλώνων ανεμογεννητριών | el |
dc.title | Εvalutation of alternative welding details for L-stub connections in wind turbine towers | en |
heal.type | bachelorThesis | |
heal.classification | Μηχανική | el |
heal.language | el | |
heal.access | free | |
heal.recordProvider | ntua | el |
heal.publicationDate | 2015-09-29 | |
heal.abstract | Αντικείμενο της παρούσας διπλωματικής εργασίας είναι η αξιολόγηση εναλλακτικών τρόπων συγκόλλησης σε συνδέσεις αποκατάστασης συνέχειας του σωληνωτού περιβλήματος μιας ανεμογεννήτριας για καταπόνηση από φορτία κόπωσης. Οι υπό μελέτη εναλλακτικοί τρόποι σύνδεσης είναι οι: φλάντζα με ορισμένες επιφάνειες επαφής, φλάντζα προσυγκόλλησης, φλάντζα με προέκταση και φλάντζα εξωραφής, για σύνδεση στο 0,85 του ύψους του πυλώνα μιας τυπικής ανεμογεννήτριας οριζόντιου άξονα, ονομαστικής ισχύος 1,5mW και ύψους πυλώνα 80m. | el |
heal.abstract | The present diploma thesis deals with the evaluation of alternative welding details for splicing connections of the tubular body of wind turbines under fatigue loads due to wind. The alternative connections discussed are: flange with defined contact area, pre-welding flange, flange with extension and external stitching flange, for a connection at 85% of the total height of the tower of a typical horizontal axis wind turbine, with rated power 1.5mW and total tower height of 80m. For the evaluation of the behaviour of every alternative connection technique, a typical L-stub connection is simulated, using 3D solid elements, which includes a bolt, the ring-like connecting flanges and a part of the tower’s shell. The numerical models are subjected to a tensile force of approximately 100kN. Non linear analysis is performed using the finite element program ADINA v9.0.0, focusing on the welding’s behavior for each different solution. Material non linearities are not taken into consideration as failure of the particular connections is expected to be due to fatique, which takes place with the stresses remaining in the elastic area. For each alternative welding detail, analyses are carried out for two sets of boundary conditions. The first includes fixing for x, y and z translation at the base of the bolt and the lower flange and of translation in the tangential direction of all nodes on the symmetry axis. The second includes the same boundary conditions as the first and the additional condition of restriction of the translation in the tangential direction of the edges of the model, thus simulating better the continuity of the flanges and shell in the physical problem. For every alternative welding solution, the stress distribution is presented in different stages of the load imposition. Through the 3D-simulation the stress distribution is depicted with high accuracy. This results in the recognition of the areas that remain relatively inactive and those where high stress concentrations are encountered for each welding alternative. Finally, a comparison of the four alternative connections is presented. | en |
heal.advisorName | Γαντές, Χάρης | el |
heal.advisorName | Γαντές, Χάρης | el |
heal.committeeMemberName | Ραυτογιάννης, Ιωάννης | el |
heal.academicPublisher | Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Πολιτικών Μηχανικών. Τομέας Δομοστατικής. Εργαστήριο Μεταλλικών Κατασκευών | el |
heal.academicPublisherID | ntua | |
heal.numberOfPages | 81 σ. | |
heal.fullTextAvailability | true |
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