This Bachelor-Thesis is about the modeling of the bearing of a windturbine in Dymola. Especially the modeling of the bearing at the high-speed shaft in the gearbox of the turbine is in the focus because that’s the most stressed component of the whole windturbine. The necessary informations and input data for this thesis are coming from eleven twelve-year-old windturbines which have problems with the bearing on the high-speed shaft. First, the work deals with finding and explaining the relevant influence parameter for a bearing, that means the parameters which affect the abrasion of the bearing. On one hand you have the driving speed, every turn the bearing did means one less turn in its term. On the other hand you have the oilcycle as a parameter. The longer the oil stays in the bearing and the older it gets, the more it will damage the bearing. The third influence which is mentioned in the Bachelor-Thesis is the friction and the heat which it produces. Second, it is about the searching and explaining of mathematical preparation for the influence parameters. For this functions from the DIN ISO Norm 281 are used. The rotational speed-module calculates the lifespan out of the variable number of rotations that a windturbine makes. This lifespan is indicated as number of turns which a bearing can do before it collapses. The oilcycle-module calculates a lifespan too but this is dependent on the bearing’s lubrication. Because the turbines are not new anymore an additional module determines the initial state of the bearing. Further the single parameters are modeled in Dymola, a modeling and simulation tool, with the coding language Modelica. For every module a special source code is created, afterwards all modules are combined in an entire bearing module. This calculates an overall lifespan and compares it with the actually made bearing-turns. With this it is possible to see how much of the lifespan already has been used and therefore when it will break. Finally there is an explanation how this tool can be validated and so it can be used for the different bearings in various windturbines.     «

This Bachelor-Thesis is about the modeling of the bearing of a windturbine in Dymola. Especially the modeling of the bearing at the high-speed shaft in the gearbox of the turbine is in the focus because that’s the most stressed component of the whole windturbine. The necessary informations and input data for this thesis are coming from eleven twelve-year-old windturbines which have problems with the bearing on the high-speed shaft. First, the work deals with finding and explaining the relevant i...     »