As onshore wind turbines are installed closer and closer to urbanized areas, wind turbine OEMs are being faced with increasingly stringent noise regulations. Compliance with these noise regulations, combined with torque density increase measures, drastically increased power levels of onshore wind turbines, shorter design cycles and designing gearboxes and powertrains in so-called product platforms translates into ever increasing design challenges for gearbox suppliers. Major design levers with respect to NVH and tonal sound according to IEC61400-11 are being decided upon in the concept phase, where not all design inputs are fixed. Thus, it is key to be able to compare different concepts, gear designs and other design parameters related to the interaction with the system level in a quick and easy way. This requires a holistic simulation approach, involving all aspects of the tonality prediction being: • gear mesh excitation • transfer path and radiation from the gear contacts to the IEC microphone using a.o. multi-body simulation • aero-acoustic masking of the wind turbine rotor The NVH risks then need to be evaluated for the different drivetrain design options available. Therefore, an integrated simulation platform has been developed which combines these different aspects involved in predicting wind turbine tonality. This enables ZF to develop NVH risk mitigation strategies pro-actively in an early phase of the design leading to less expensive and better integrated solutions which can be implemented throughout their product platforms.
|Authors||Marrant. B Schmidt. S|
|Date||16th May 2023|
|Organisations||ZF Friedrichshafen AG|