The project main aim is to study drive train system dynamics of wind turbines. The drive train system is here considered as the electro-mechanical subsystem comprising shafts, bearings, gearbox, shaft couplings, mounts, generator, and other functional components of a wind turbine that transfers mechanical power from the rotor hub to the electric power generator, and thereby plays an important role in a wind turbine dynamics.
The project includes both theoretical and experimental study the drive train; and focusses on the high-speed shaft subsystem of indirect drive wind turbines. The objective is to understand and predict how the functional components interact with respect to external loads, misalignments and other excitations. It is expected that the obtained knowledge will contribute to the understanding why sometimes drive train functional components like bearings and gearboxes have failed after substantially shorter time (1-7 years) instead of the 20 years they were designed for. As an example of results, the method of global sensitivity analysis has been used to analyze the drive train dynamics dependency on structural parameters and to show how this knowledge can be used to evaluate new concepts of condition monitoring systems to detect faults in drive train functional components.