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Dynamic modeling and analysis of measurement in hydro power rotor system
2004 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Hydro power is one of the most important renewable techniques for production of electricity world wide as well as in Sweden. Energy converters are in general multi physical objects. For example, the mechanical system of a hydro power plant will be influenced of the fluid dynamics in the turbine, the electro mechanics in the generator and the rotor-bearing dynamics. Until recently the research area of hydro power has only been focusing on these areas separately. In rotor dynamics, the multi physics of hydro power system is a relative new research. Therefore, modeling of hydro power system as a coupled rotor dynamic, electro mechanic and fluid dynamic system is an interesting research area. This thesis is a part of an ongoing research project regarding characterization and modeling of old hydro power plants. The project is a cooperation between Luleå University of Technology, Uppsala University, The Swedish energy industry and The Swedish authority of energy. The aim of this thesis is to develop and investigate a simplified analytic rotor dynamical model of the whole rotor-shaft system. A linear, eight degree of freedom, model is developed. The equations of motions for the generator and turbine are solved concerning unbalance-, electro magnetic- and fluid- forces. It is found that the motions of the turbine will influence the motions of the generator and vice versa. This coupling is interesting for future development of models for the electro magnetic simulation in the generator as well as for the fluid dynamic simulation in the turbine. It is also shown that this model will predict that frequencies appearing in the turbine also will occur in the bearings. The use of a rotor dynamic model coupling the electro mechanical and fluid forces may be interesting in the future work concerning to characterize, model and develop hydro power plants.

Place, publisher, year, edition, pages
Keyword [en]
Technology, rotor dynamic, hydro power, fluid forces, turbine forces, electromechanical forces, unbalance forces
Keyword [sv]
URN: urn:nbn:se:ltu:diva-51248ISRN: LTU-EX--04/140--SELocal ID: 87705efc-07b0-479d-9be6-8dbd53a7103bOAI: diva2:1024610
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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