Rotational sampling in wind turbines

<p>The loads on both <a href="/facts/Horizontal-axis_wind_turbine/lUfWqfLg">horizontal-axis wind turbines</a> (HAWTs) and <a href="/facts/Vertical-axis_wind_turbine/Bf51o7A6">vertical-axis wind turbines</a> (VAWTs) are cyclic; the <a href="/facts/Thrust/EM04CqV7">thrust</a> and <a href="/facts/Torque/KcrcvNtV">torque</a> acting on the blades depend on where the blade is. In a horizontal axis wind turbine, both the apparent <a href="/facts/Wind_speed/QghYfL3e">wind speed</a> seen by the blade and the <a href="/facts/Angle_of_attack/v5NkMgqu">angle of attack</a> depends on the blade's position. This phenomenon is described as 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.
</p><p>Rotational sampling can be divided into two parts: <a href="/facts/Deterministic_system/oT1NvyHD">deterministic</a> and <a href="/facts/Stochastic_process/Ng1n1dnB">stochastic</a>.  Deterministic processes present themselves as spikes on a <a href="/facts/Power_spectral_density/q3Rfs7b0">power spectrum</a>, where as stochastic processes spread over a wider <a href="/facts/Frequency_range/94Rq1PkQ">frequency range</a>.
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Rotational sampling in wind turbines open-in-new

Rotational sampling in wind turbines