Cyclic pitch for the control of wind turbine noise amplitude modulation

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Abstract

Using experimental data acquired during a wind turbine measurement campaign, it is shown that amplitude modulation of aerodynamic noise can be generated by the rotating blades in conjunction with the atmospheric wind shear. As an attempt to alleviate this phenomenon, a control strategy is designed in form of a cyclic pitch of the blades. As a side effect, it is shown that it is also possible to reduce fatigue load on the blade using this cyclic pitch. The main goal is to reduce both amplitude modulation and fatigue load without compromising the energy harvested from the wind. A simulation tool that can model the different aerodynamic and aeroacoustic aspects of the study is presented. Parameters controlling the cyclic pitch are optimized in order to reduce amplitude modulation and/or fatigue load to a minimum. It is shown that such a minimum can be found and that benefit may be achieved if such a strategy is to be implemented on an actual wind turbine, though at the expense of an increased wear and tear of the pitch control system.
Original languageEnglish
Title of host publicationProceedings of Inter-noise 2014
Number of pages8
Publication date2014
Publication statusPublished - 2014
Event43rd International Congress on Noise Control Engineering - Melbourne, Australia
Duration: 16 Nov 201419 Nov 2014

Conference

Conference43rd International Congress on Noise Control Engineering
CountryAustralia
CityMelbourne
Period16/11/201419/11/2014

Keywords

  • Sound radiation
  • Microphone arrays
  • Spherical arrays
  • Acoustic holography

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