Računalna dinamika vjetroagregata

undergraduate thesis

• Title (english): Computational dynamics of wind turbine
• Author: Andrej Šubat
• Mentor: Tomislav Jarak (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2015-03-06, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Ovaj rad je izrađen u sklopu IPA IIIC projekta „Centar izvrsnosti za procjenu stanja konstrukcija“ (CEEStructHealth), sufinanciranog iz sredstava Europske unije.
Povećanje snage i dimenzija vjetroagregata, u sprezi s konstrukcijskim i ekonomskim ograničenjima mase, rezultiraju lakim i fleksibilnim konstrukcijskim izvedbama vjetroagregata. Time se povećava dinamičko opterećenje konstrukcije pa je detaljno razumijevanje dinamičkog ponašanja nužno za procjenu pouzdanosti, učinkovitosti i životnog vijeka iste.
U radu je potrebno analizirati dinamički odziv vjetroagregata K80 tvrtke Končar te je izrađen njegov diskretizirani model metodom konačnih elemenata (MKE) u programskom paketu Abaqus. Model je pojednostavljen, ali su u njemu zadržani svi elementi konstrukcije koji utječu na dinamički odziv uslijed opterećenja pri radu vjetroagregata. Dinamičkom analizom provedenom na izrađenom modelu ispitan je i utjecaj giroskopskog efekta na dinamički odziv.
Rad je razrađen po poglavljima od koji je prvo uvodno, a u njemu je kratak opis i tehnički podaci vjetroagregata K80. Zbog lakšeg razumijevanja rezultata i provedene analize, drugo i treće poglavlje sažeto pokrivaju osnove teorije vibracija, diskretizacije sustava i utjecaja giroskopskog efekta na vibracijske sustave. U četvrtom poglavlju je prikazana izrada modela u programskom paketu Abaqus uz objašnjena korištenih pojednostavljenja modela i načina zadavanja opterećenja. U slijedeća dva poglavlja izneseni su dobiveni rezultati te je na temelju njih izveden zaključak o utjecaju giroskopskog efekta na dinamički odziv vjetroagregata K80 u njegovom radu.

Abstract (english)

This thesis is completed in the framework of IPA IIIC project "Centre of Excellence for Structural Health" (CEEStructHealth) co-financed by the European Union.
Power and dimension increase, coupled with structural and economical limitations regarding mass, result in light and flexible wind turbine designs. This, consequently increases dynamic stresses in the construction and for that reason understanding of its dynamic response is necessary for evaluation of efficiency, reliability and durability.
Main object of this thesis was to analyse dynamic response of K80 wind turbine, produced by Končar. For this analysis a discrete model was created using finite element method (FEM) using Abaqus product suite. The model is simplified, but all elements of construction relevant to dynamic response were retained. Using the same discrete model, influence of the gyroscopic effect on dynamic behaviour of the wind turbine was also examined.
The thesis is divided into chapters, first one being introductory and giving a brief overview and technical specification of K80 wind turbine. For easier understanding of obtained results and performed analysis, second and third chapter cover basics of theory of vibration, system discretization and influence of gyroscopic effect on vibrating systems. In chapter four describes the process of creating discrete model and defining structural loads in Abaqus. In the next two chapters obtained analyses results are displayed and a conclusion, regarding the influence of gyroscopic effect on dynamic behaviour, based on those results is drawn.

• Keywords: dinamički odziv; vibracije; giroskopski efekt; vjetroagregat; forme vibriranja; Abaqus; metoda konačnih elemenata
• Keywords (english): dynamic response; vibration; gyroscopic effect; wind turbine; mode shapes; Abaqus; finite element method
• Language: croatian
• URN:NBN: urn:nbn:hr:235:885968
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-05-22 12:46:21