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The loads on both [[horizontal-axis wind turbine]]s (HAWTs) and [[vertical-axis wind turbine]]s (VAWTs) are cyclic; the [[thrust]] and [[torque]] acting on the blades depend on where the blade is. In a horizontal axis wind turbine, both the apparent wind speed seen by the blade and the [[angle of attack]] depends on the blade's position. This phenomenon is described as [[Rotational sampling in wind turbines|rotational sampling]]. This article will provide insight into the [[cyclic]] nature of the loads that arise because of rotational sampling for a horizontal axis wind turbine.
Rotational sampling can be divided into two parts: [[Deterministic system|deterministic]] and [[Stochastic process|stochastic]]. Deterministic processes present themselves as spikes on a [[Power spectral density|power spectrum]], where as stochastic processes spread over a wider frequency range. I don’t know what I am doing, nor what is being spoken about, but I hope you have a good day.
{{Further|Wind turbine design}}
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