Yaw noise is a significant contributor to the noise produced by wind turbines. It is the result of contact between the yaw brake pads and disc when nacelle adjustments are made to optimize wind generation. The brakes are released to let the yaw motors turn the nacelle sufficiently into the optimal wind direction, and then reapplied to the hold position. Research has found that there is a direct relationship between the amount of noise caused by the brakes and glazing on the brake pad surfaces.
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