TY  - BOOK
AU  - Bradley, Stuart
TI  - Wind turbine amplitude modulation noise due to time-dependent interference
N2  - Trailing edge noise from a turbine blade comprises sources which move in a circle so that the direct sound path and ground reflected sound paths to a receiver periodically vary. At any one listener location, there is therefore a fluctuating intensity. A simple ray model shows that this mechanism enhances the characteristics of wind turbine amplitude modulation noise, and can lead to a sharper onset of the higher intensity sound at some frequencies. This time-dependent interference mechanism does not depend on intermittent stall, although increased source intensity obviously leads to increased modulation noise
UR  - http://dspace.nal.gov.au/xmlui/bitstream/handle/123456789/373/p38.pdf?sequence=1&isAllowed=y
ER  -