Resource Documents by Metelka, Andy
Dooley, Kevin; and Metelka, Andy
Acoustic interaction as a primary cause of infrasonic spinning mode generation and propagation from wind turbines
Abstract. Relatively balanced load related pressure waves from the rear surface of each rotor blade, are at a frequency of 1 per revolution of the turbine and are phase shifted by 120 degrees from each other. The superpositions of these infrasonic waves destructively interfere. This action results in a non-propagating rotor locked mode, however, the shielding (reflecting) effect of the tower as each blade passes, interrupts the balanced destructive interference for a small portion of rotor angle three times per . . . Complete article »
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