Effect of element failure in active coatings for wind turbine generator blades

Chambers, B.; Ford, K.L.; Tennant, A.

doi:10.1109/aps.2008.4619274

Cited by 1 publication

(1 citation statement)

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“…Shaping applies primarily to the tower and nacelle regions, since blade shape controls aerodynamic performance and energy efficiency. Active component solutions alter blade Doppler response with a phase-switched screen, either by shifting Doppler reflections outside of the detectable spectrum, or by adding a high intensity Doppler response that can be used to identify wind turbines [66,67,68,69,70]. Both approaches require active switches or similar components which increase fabrication complexity and cost.…”

Section: At-the-turbine Solutionsmentioning

confidence: 99%

Radar-cross-section reduction of wind turbines. part 1.

Brock¹,

Loui²,

McDonald³

et al. 2012

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In recent years, increasing deployment of large wind-turbine farms has become an issue of growing concern for the radar community. The large radar cross section (RCS) presented by wind turbines interferes with radar operation, and the Doppler shift caused by blade rotation causes problems identifying and tracking moving targets. Each new wind-turbine farm installation must be carefully evaluated for potential disruption of radar operation for air defense, air traffic control, weather sensing, and other applications. Several approaches currently exist to minimize conflict between wind-turbine farms and radar installations, including procedural adjustroents, radar upgrades, and proper choice of low-impact wind-farm sites, but each has problems with limited effectiveness or prohibitive cost. An alternative approach, heretofore not techoically feasible, is to reduce the RCS of wind turbines to the extent that they can be installed near existing radar installations. This report summarizes efforts to reduce wind-turbine RCS, with a particular emphasis on the blades. The report begins with a survey of the wind-turbine RCS-reduction literature to establish a baseline for comparison. The following topics are then addressed: electromagnetic model development and validation, novel material development, integration into wind-turbine fabrication processes, integrated-absorber design, and wind-turbine RCS modeling. Related topics of interest, including alternative mitigation techoiques (procedural, at-the-radar, etc.), an introduction to RCS and electromagnetic scattering, and RCS-reduction modeling techniques, can be found in a previous report.

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